Thanks so much for that feature! This puzzle was inspired by puzzles from zegres and jeremy dover who introduced the "keypad knight line". I still remember the day when I first encountered those and thought "what crazy minds would come up with this?". Excellent work on the break-in from Simon (as expected)!
Brilliant puzzle! Simon says you took it to the max. I think you can do better. Knight Snake (snake line where digits have to move along knight moves on the numpad)
24:19 for me. All those hours spent as a kid trying to mentally hop between the brown tiles on the bathroom floor using only knight's moves have finally slightly come in handy.
If we were in the US, it would be "check" but almost certainly not "mate". If we were in the UK, it would be "bill" not "check". Maybe the joke would work in Australia or New Zealand. There, I acknowledged that it's a joke. Be grateful. 😄
Very happy to see a chess lines puzzle on CTC. I tried to get this constraint going 2 years ago with Jeremydover and Raumplaner. I’m pretty sure Knight Line on LMD was the first with these exact rules. Anyway check out some of those puzzles on LMD if you like the ruleset. I think it’s cool and has more potential. There are links in Knight Line to some of the other puzzles. As always gdc made a beautiful puzzle with these rules!
It's so great seeing setters inspire each other; I''ve seen a few others (gUBBLOR especially) use the logic to good effect. Would love to see you revisit the ruleset and what you might do with the other chess lines.
You can also rule the zig-zag bishop as being all odds without solving the long knight, which is how I started. If you start at either end with a 2, the middle space must be an 8, and then the 5th space has no valid value (since it sees 2 or 8 and would need to be 2 or 8). Since this holds for any starting value (since hopping between even digits is cyclical and symmetric), it must be odd, which makes the horizontal bishop even, and the rook is then all odd and can't contain a 5, which gets you the 5 in r2c1, and then in r5c2. It doesn't necessarily help to go this route before the long knight, but it does make the zig-zag bishop solve a lot faster than trying to work through it in one direction based on the digits left over from the long knight.
I actually started with that Bishop line, because its 4 digits that all see each other. If a Bishop is on the diagonals, the most digits it can do is 3 before having to revisit a 5 in order to shift to the other diagonal, therefore it must only use evens. Then because the Rook line next to it is also 4 long without a repeat and can't use evens, it must use the corner digits. So 5 is set at the front of the row off the bat.
@@TheBioRules But a bishop doesn't have to go 1 space at time (as a pawn or king does), so it could, for example, go 7-3-5-1-9, allowing all 5 odds to be on the line, even if they all see each-other. (If I am reading your comment correctly)
18:52 "If this is odd numbers..." Could skip a few steps here, as already noted c2 has its complement of odd numbers, so r2c2 must be even and by extension so must its bishop line...
Rules: 02:13 Let's Get Cracking: 06:56 What about this video's Top Tier Simarkisms?! Bobbins: 2x (31:50, 35:05) Phistomefel: 1x (03:18) And how about this video's Simarkisms?! Ah: 9x (06:00, 11:08, 11:08, 11:29, 28:54, 31:29, 35:02, 37:47, 40:04) By Sudoku: 6x (13:52, 30:29, 32:06, 34:22, 34:33, 35:19) Clever: 5x (01:23, 12:03, 12:06, 40:40, 41:04) Lovely: 5x (00:39, 06:34, 14:35, 22:46, 39:34) Gorgeous: 4x (17:53, 39:39, 41:37, 41:39) Obviously: 4x (06:08, 06:23, 07:41, 15:50) Good Grief: 3x (24:00, 29:26, 40:36) Sorry: 3x (08:17, 08:17, 22:29) Beautiful: 3x (36:04, 41:02, 41:18) The Answer is: 2x (29:10, 40:44) Bizarre: 2x (01:59, 17:15) Unbelievable: 2x (03:09, 03:12) In Fact: 2x (19:26, 40:16) What Does This Mean?: 2x (26:32, 27:22) Pencil Mark/mark: 2x (31:12, 33:54) Weird: 2x (21:37, 37:27) Naked Single: 1x (31:36) I Have no Clue: 1x (26:34) Brilliant: 1x (30:47) Incredible: 1x (03:00) Ridiculous: 1x (17:49) Take a Bow: 1x (41:48) Hang On: 1x (21:08) I've Got It!: 1x (39:14) We Can Do Better Than That: 1x (19:55) Most popular number(>9), digit and colour this video: Forty Eight (3 mentions) Three (68 mentions) Black, Green (2 mentions) Antithesis Battles: Even (15) - Odd (11) Outside (2) - Inside (0) Black (2) - White (1) Row (6) - Column (6) FAQ: Q1: You missed something! A1: That could very well be the case! Human speech can be hard to understand for computers like me! Point out the ones that I missed and maybe I'll learn! Q2: Can you do this for another channel? A2: I've been thinking about that and wrote some code to make that possible. Let me know which channel you think would be a good fit!
I thoroughly hope to see more puzzles with this rule set. Approachable enough to wrap my head around the rules, but challenging enough to feel quite rewarding when making progress. What a wonderful puzzle. Hats off to gdc! Cheers (Or perhaps I should say check)!
At 22:18, you made a mistake by saying r2c8 is not a 1. It's not a 3. Luckily, it didn't have any effect (positive or negative) in the rest of the solution.
I think you are talking of r2c7, then you're right. I thoght, I was missing some argument in Simon's video andnlooked at it again and again, but he defintedly was wrong at this point.
@@ilsekleibscheidel7219no OP is correct. 22:13 : He says r2c8 can’t be a 1 because r2c6 can’t be a 7. However 7 and 3 are opposite along a diagonal on the numpad, not 7 and 1 as Simon mistakenly thought.
17:49 "This isn't going to turn into a parity puzzle, is it?" My first thought while he was reading the rules was that bishop lines have single parity and knight lines alternate; so I would have coloured it right away.
57:15 - What a brilliant and original puzzle. Some great logic there. I was a bit slow at spotting the implications of the long 🐴 line but I thoroughly enjoyed every minute of it! Thanks @gdc42
@@46lespaul you were not. I didn't trust myself and turned the video back, because this is not the kind of error Simon tends to. He usually only hits the wrong number, while saying the right one. But luckily this didn't affect the solution.
This took me 8 hours (with the middle 7 hours being mostly just staring at it over multiple days), but I did it. I did it without any help. And it was amazing.
Interesting rule set, solved in 31:14. I was expecting the bishop lines to have to be the break in after quickly discerning that they must be opposite parity, but was pleasantly surprised to discover that it was in fact the long knight line that was the most restricted, and indeed determines the parity of the bishop lines.
Needed help with the break-in about the string of legal knight's moves, but got the rest out with no problems. Lovely interaction between sudoku and chess logic!
Finished in 17:34. Seems fairly straightforward once you map out all the of the possible knights moves on a keypad. Interesting ruleset and fun puzzle!
That is a brilliant puzzle 👏🏻👏🏻👏🏻 I loved every step of solving it. This way of incorporating chess movements was so much fun. Give us more please 😄👍🏻👍🏻👍🏻❤️
The chess pieces jumping around on the numpad reminds me of an old XKCD comic ("Explorers", number 839). A bishop and a knight is on a 3x3 board, and they are not getting along at all. Also, the emergent parity rules (bishops lines stay on a single parity, knights alternate parity) are quite cool.
That was so much fun! That ruleset what definitely my favorite in a long time. I focused on the puzzle as a parity puzzle for a bit too long, but it definitely helped me to make good headway at the start.
One of the most fun puzzles I have ever solved. Being a chess player definitely gave me a head start knowing that the knight always alternates colors when it moves.
What a puzzle! I solved it much slower than Simon, but I'm still happy to achieve it. I haven't noticed at first the nice restriction the long knight path does and started with working around the parity of the cells from the two bishop lines. Simons combinatoric skills are unmatchable, he comes to the result with such elegance and effectiveness I can only dream about.
It is a joy to see new ideas, so the diversity of variant sudoku keeps growing. Not every idea is so entertaining as that one. I like chess and I love CtC channel . Perfect evening for an old guy like me.
20:31 finish. A fun little chess puzzle, although I don't use the number pad myself and had to keep referencing it. I color coded each side of the knight rotation from 7 to 3, making it a bit easier to see where things fit (on the knight lines, anyway). Excellent job!
The whole video i was wondering if simon would ever realize he has a number pad on his screen (on the app). turns out, no he does not. granted it might be inverted, but it still has the same layout and so the same restrictions
I actually spent some time looking at the number pad on my keyboard and the number pad on the mobile app and wondering if it mattered that the order of the rows was flipped (it doesn't).
@@droid-droidsson You can flip it but like i said, it still has the same restrictions as the uninverted version. also me being used to the univverted version, i would be missclicing a lot.
I finished in 71 minutes. This ruleset took me some time to figure out, but I feel like I picked up on a lot of its tricks. Bishops always have to be odd or even. Knights can't have 5s on them and cycle through 8 numbers unless able to turnaround. Knights alternate between odd and even. Pawns of three length in a row must always have the center digit be from the center row. Rooks need an even digit as a transfer junction to get to 5. I'm excited to see what others do with this ruleset, because this feels very malleable with other rulesets. Great Puzzle!
Great puzzle and solve Simon! I think it would be cool if you could let us know how difficult you feel each puzzle is out of 5 stars after you've solved them? This might be a nice interesting addition to the closing of each video.
13:20 "This could be different or the same as this digit" In a vacuum, maybe, but since you already have the other 26 in that box from the other end of the sequence it's forced...
I’m so happy! This is the first sudoku from this channel I’ve ever solved. I’m a chess master so I really wanted to try my best at a “chess” sudoku. Why does this feel so exhilarating? Lol
I really adored this puzzle. I hopped on the parity train from the start, beginning with the zig-zag Bishop line. I determined with ABCD analogues that it could not be an "even" bishop line, which followed that the adjacent bishop couldn't be odd, which pointed to the rook line as being comprised of all odds. I enjoyed starting there because it made the unfolding of the long knight line even more satisfying as I already had a bunch of pencil marks above to be unraveled with the precocious pairs that the knight pointed to. Just great fun.
20:55 for me, very happy with my solve. Played a good amount of chess in my life which helped; the main thing for me was finding the long knight line break in almost immediately (realized there could only be one sequence that landed you on 7 for the 8th digit in the sequence) and the rest flowed from there. Really cool idea and a very fun puzzle!
Fun and surprisingly light for me. Took a bit of experimentation after discerning the five numbers on a line in R6, but smooth sailing after that. A rare win over Simon. 29:19.
Simon, I recommend using the numpad when you do sudoku. Also, you can enter corner marks while holding shift, and you can enter central marks when holding control. That way you don't have to press a key multiple times to enter a digit.
If you ever do a puzzle with this rule set again, you can illustrate the moves each piece can make by just clicking in any of the 3×3 boxes. For example, click on cell 8 of one of the boxes, and then you can click on cells 1 and 3 to see how a knight can move. This might be easier than looking at the number pad or even the numbers over on the side in the software and having to mentally visualize it. The top and bottom rows will be swapped, but that doesn't affect the solve.
found this one pretty easy, I found it easier if you color the squares. finished it in 72:18. Could have finished it quicker, but I made it a point to finish the coloring before finishing the puzzle
I solved it, but I had to restart once, back track twice more, mostly for stupid reasons. One, I have been doing so many orthogonal rules in puzzles lately that I forgot that kings can move diagonally, lol. Two, I tried using coloring to help with determining odd cells, but because I kept forgetting the king could move diagonally, I kept ruling the 3 off that line, and that made my coloring wrong. It did lead me to the cell I had to focus on, because it was one cell in particular that kept breaking the puzzle, but even from there, I'm not sure what my third mistake was, but I backtracked all the way to the part that I had finally knew was correct and took a different path forward which prevented the same mistake and I got there. Longer than I care to admit, but I solved it, none the less. Thanks for a fun morning diversion.
Loved this! I felt like I was down the rabbit-hole in Wonderland, playing a weird sudoku with Alice, the Mad Hatter, the White Rabbit, etc. It was great how the stalwart pawn plodded his way straight ahead, from 2 - 5 - 8, breaking open the rest of the puzzle. There is so much room for exploring & developing this rule set. I'm looking forward to this rule set in a FOGGY landscape. Lewis Carroll (Prof.Dodgson) would approve. Beware the Jabberwock, my son!!!
17:32 "So these are all even digits, this is going to turn into a parity puzzle" - I wondered how Simon only now noticed the parity. A bishop is staying on its parity, while a knight (and pawn) is always switching parity, this is how I started it.
37:29. Took me a while to see what was going on with the 7 in box 2, after that it was a pretty smooth solve. You can get a lot of info out of odd/even colouring with this ruleset, since bishops keep the same parity and knights alternate parity.
I solved the puzzle with a lot of usage of coloring the parity, two interesting observations are that knights always change parity and bishops always have the same parity. That gave me a few free digits, for example I deduced that r7c3 was odd so r7c4 must be even and I had already used all three other evens in column 4.
Intriguing puzzle. I ran into an issue because I accidentally reversed the 6 and 8 in box 2, because I didn't double-check the number pad before filling them in. Fortunately, once I discovered that and fixed it, I was able to re-use most of the logic that I had discovered before to get back to where I had been. My time was 34:37, solver number 6228.
Shouldn't Simon be able to see the layout of the numbers on his screen, by looking at Sven's input panel? There was no need to keep looking down at his number pad on his keyboard.
@@AaronSmith-i8y Possibly for this video, but for others where he uses the pen tool he would need to be able to see it, so he obviously can see the number pad sometimes at least.
45:53, that I took to coloring odds and evens and it worked is super impressive. I didn't have a screwup with the kings line in box 6, after learning it had to go from 7 to 4 or 9, I started treating it as only able to move orthogonally and ruled out too many digits from r5c8.
Note that in the software, although the numbers are a mirror of the numpad, the number grid there is effectively identical to the numpad, so Simon didn't HAVE to look down for it.
This one really played with my head, and I felt my solve, while fully logical, was pretty sloppy - Simon's solve was much smoother and cleaner! 🙂 Finished in 40:24 (conflict checker off), many thanks to gdc for an amazing puzzle!
yeah, really enjoyed it, maybe my fav sudoku yet!. quite sad i made some simple mistake and had to go back 20 digits, but it's still quite a great concept to look at the pieces in the keypad context
I would say the knight line would be the most interesting to have as a "basic rule" Adding all of them would probably need too much explanation all the time and most of them don't really feel as restricting But who knows
I did use parity coloring when solving. It nearly screwed me up because the first rook line you think about is all one parity but of course this does not mean that rook lines can never have digits of both parties, just that a certain parity must always have a buffer between them on the line.
Instead of limericks, now I choose To rhyme a rhyme like Doctor Seuss. To speak Iams in rows of four And thus a new form I'll explore. Till today I have not ever Seen a puzzle quite so clever As this chess sudoku grid. I'd remember if I did. Twas a little scarity Till we saw that parity And patterns came along to guide us Bringing answers from inside us. Fingers dancing, keyboard blazing, Simon once more proved amazing, Brimming with such mental power, Coming in below an hour! Now the puzzle has been done through. We al had a lot of fun, too. While we all were donut snacking, As we did our cryptic cracking. From Fnaire and I (the Ma and Pa) Kids, grandkids and kids-in-law, Simon, you've our thanks and praise. They'll be back in seven days.
As soon as I saw these rules, a related ruleset popped into my head for which I can already see some interesting bits of logic even without a concrete puzzle in front of me… but I suspect I don't have the spoons to build a human-solvable puzzle on it.
This took me 121:51. (Solve-Counter 4217.) While I pencil-marked (and parity-colored) most of the lines early, and then used some coloring and lettering to progress somewhat, I forgot for a long time to re-check the lines for eliminating more options, after some information was found. I noticed again that my number-pad is vertically mirrored to the one in the app, i.e. the 9 is in the upper right corner, not the lower right (but fortunately this doesn't change the rules).
I colored even and odds. A knight move always changes chirality and bishop need to keep chirality, easy way to see that bishop line was odd, and then the other one had to be even because odd would break the rook line.
I agree that coloring could be helpful here. But I think parity is the more commonly used term for distinguishing even and odd, not chirality (for which I couldn’t find a number theory definition).
Now there will probably be one setter evil enough to make a puzzle with chess lines where Simon will have to deduce to which piece each line belongs. With one line being wrogn.
EDIT: OHHHH I am missing something... This comment is WRONG. King can move from 4 directly to 2. So ignore. 8:20 It would be more helpful to you if you spotted that you have an X-wing on fives in boxes 4 and 5. Thus eliminating 5 from R5C7. And so the next cell in the king line is from 179 and the final cell on the king line is from 4268. This because the king line cannot have a 5 on it because of the x-wing. So the king line alternates between odd and even digits. And it cannot reach the digit 3 in three moves from 7. Here's a list of possibilities. starting in R5C7. 478 874 412 896 The king will do one of those moves in that exact order.
Thanks so much for that feature! This puzzle was inspired by puzzles from zegres and jeremy dover who introduced the "keypad knight line". I still remember the day when I first encountered those and thought "what crazy minds would come up with this?". Excellent work on the break-in from Simon (as expected)!
Love what you did with this!
Brilliant puzzle, thank you gdc!
Brilliant puzzle! Simon says you took it to the max. I think you can do better. Knight Snake (snake line where digits have to move along knight moves on the numpad)
That is a very elegant and fluid puzzle.
Stratospherically beautiful construction
👏👏👏👏👏👏👏👏👏👏
24:19 for me. All those hours spent as a kid trying to mentally hop between the brown tiles on the bathroom floor using only knight's moves have finally slightly come in handy.
A former chess grand master started to work at a restaurant and the guests shouted Cheque Mate all the time.
If we were in the US, it would be "check" but almost certainly not "mate". If we were in the UK, it would be "bill" not "check". Maybe the joke would work in Australia or New Zealand. There, I acknowledged that it's a joke. Be grateful. 😄
@@Hertog_von_Berkshire Americans aren't rubes, mate. We get it. Just took me awhile to get off the floor.
Works around the world, if you do it with an Aussie accent! :)
Before that, they'd point at the bread and say "Stale, Mate!"
I asked for a good fork and wasn't disappointed!
GDC has finally made Simon use the number pad!
He's "used" it in a similar reference-only way for the rule of thumb on mod-3 groups...
Very happy to see a chess lines puzzle on CTC. I tried to get this constraint going 2 years ago with Jeremydover and Raumplaner. I’m pretty sure Knight Line on LMD was the first with these exact rules. Anyway check out some of those puzzles on LMD if you like the ruleset. I think it’s cool and has more potential. There are links in Knight Line to some of the other puzzles.
As always gdc made a beautiful puzzle with these rules!
Thanks so much for coming up with that constraint! It was very fun to set with.
It's so great seeing setters inspire each other; I''ve seen a few others (gUBBLOR especially) use the logic to good effect. Would love to see you revisit the ruleset and what you might do with the other chess lines.
@@patrickgass787you actually inspired me. I have an idea for a puzzle, will see if it works.
@gdc42 absolutely loved this from you!! Masterful as always!!
@zegres loved how you created this variant! can't wait to see your idea for a puzzle. Always a pleasure to try solving one of your beauties!!
@18:52 you can rule out odd digits on the bishop's line very easily because all the odd digits in column 2 have been placed.
You can also rule the zig-zag bishop as being all odds without solving the long knight, which is how I started.
If you start at either end with a 2, the middle space must be an 8, and then the 5th space has no valid value (since it sees 2 or 8 and would need to be 2 or 8). Since this holds for any starting value (since hopping between even digits is cyclical and symmetric), it must be odd, which makes the horizontal bishop even, and the rook is then all odd and can't contain a 5, which gets you the 5 in r2c1, and then in r5c2.
It doesn't necessarily help to go this route before the long knight, but it does make the zig-zag bishop solve a lot faster than trying to work through it in one direction based on the digits left over from the long knight.
I actually started with that Bishop line, because its 4 digits that all see each other. If a Bishop is on the diagonals, the most digits it can do is 3 before having to revisit a 5 in order to shift to the other diagonal, therefore it must only use evens. Then because the Rook line next to it is also 4 long without a repeat and can't use evens, it must use the corner digits. So 5 is set at the front of the row off the bat.
@@TheBioRules But a bishop doesn't have to go 1 space at time (as a pawn or king does), so it could, for example, go 7-3-5-1-9, allowing all 5 odds to be on the line, even if they all see each-other. (If I am reading your comment correctly)
Such a treat to see gdc featured! Their puzzles are always interesting, always innovative and always the best possible expression of the logic.
Fabulous solving Simon. Very lovely and masterful puzzle from you Gdc!! Liked how you incorporated every single chess piece!!
18:52 "If this is odd numbers..." Could skip a few steps here, as already noted c2 has its complement of odd numbers, so r2c2 must be even and by extension so must its bishop line...
Right I was confused what Simon was going on about with hypotheticals. He had already established that R2C2 was even.
Rules: 02:13
Let's Get Cracking: 06:56
What about this video's Top Tier Simarkisms?!
Bobbins: 2x (31:50, 35:05)
Phistomefel: 1x (03:18)
And how about this video's Simarkisms?!
Ah: 9x (06:00, 11:08, 11:08, 11:29, 28:54, 31:29, 35:02, 37:47, 40:04)
By Sudoku: 6x (13:52, 30:29, 32:06, 34:22, 34:33, 35:19)
Clever: 5x (01:23, 12:03, 12:06, 40:40, 41:04)
Lovely: 5x (00:39, 06:34, 14:35, 22:46, 39:34)
Gorgeous: 4x (17:53, 39:39, 41:37, 41:39)
Obviously: 4x (06:08, 06:23, 07:41, 15:50)
Good Grief: 3x (24:00, 29:26, 40:36)
Sorry: 3x (08:17, 08:17, 22:29)
Beautiful: 3x (36:04, 41:02, 41:18)
The Answer is: 2x (29:10, 40:44)
Bizarre: 2x (01:59, 17:15)
Unbelievable: 2x (03:09, 03:12)
In Fact: 2x (19:26, 40:16)
What Does This Mean?: 2x (26:32, 27:22)
Pencil Mark/mark: 2x (31:12, 33:54)
Weird: 2x (21:37, 37:27)
Naked Single: 1x (31:36)
I Have no Clue: 1x (26:34)
Brilliant: 1x (30:47)
Incredible: 1x (03:00)
Ridiculous: 1x (17:49)
Take a Bow: 1x (41:48)
Hang On: 1x (21:08)
I've Got It!: 1x (39:14)
We Can Do Better Than That: 1x (19:55)
Most popular number(>9), digit and colour this video:
Forty Eight (3 mentions)
Three (68 mentions)
Black, Green (2 mentions)
Antithesis Battles:
Even (15) - Odd (11)
Outside (2) - Inside (0)
Black (2) - White (1)
Row (6) - Column (6)
FAQ:
Q1: You missed something!
A1: That could very well be the case! Human speech can be hard to understand for computers like me! Point out the ones that I missed and maybe I'll learn!
Q2: Can you do this for another channel?
A2: I've been thinking about that and wrote some code to make that possible. Let me know which channel you think would be a good fit!
I enjoy clicking through all the time stamps just hearing "ah, ah, lovely, lovely, lovely"
I thoroughly hope to see more puzzles with this rule set. Approachable enough to wrap my head around the rules, but challenging enough to feel quite rewarding when making progress. What a wonderful puzzle. Hats off to gdc! Cheers (Or perhaps I should say check)!
That finale with the queen was absolutely perfect, one of the nicest endings to a puzzle I have seen recently. Lovely work mate!
Don't know why, but Simon head down half of the time, looking at his numpad, has some charm
Also fairly silly, since there is a number pad on the solving screen - just where Simon's head is...
@@nightwishlover8913 unless you're in colouring mode, which actually would have served Simon well on a couple of occasions...
At 22:18, you made a mistake by saying r2c8 is not a 1. It's not a 3.
Luckily, it didn't have any effect (positive or negative) in the rest of the solution.
I think you are talking of r2c7, then you're right. I thoght, I was missing some argument in Simon's video andnlooked at it again and again, but he defintedly was wrong at this point.
@@ilsekleibscheidel7219no OP is correct. 22:13 : He says r2c8 can’t be a 1 because r2c6 can’t be a 7. However 7 and 3 are opposite along a diagonal on the numpad, not 7 and 1 as Simon mistakenly thought.
17:49 "This isn't going to turn into a parity puzzle, is it?"
My first thought while he was reading the rules was that bishop lines have single parity and knight lines alternate; so I would have coloured it right away.
57:15 - What a brilliant and original puzzle. Some great logic there. I was a bit slow at spotting the implications of the long 🐴 line but I thoroughly enjoyed every minute of it! Thanks @gdc42
Got a little lucky at 22:10 with R2C8 hehe
I thought i was crazy glad i wasnt the only one who noticed
@@46lespaul you were not. I didn't trust myself and turned the video back, because this is not the kind of error Simon tends to. He usually only hits the wrong number, while saying the right one. But luckily this didn't affect the solution.
As with most puzzles on this channel, I didn't even know where to start, so I went straight to enjoying watching the solve. Very clever rule set.
Excellent puzzle and solve by Simon! I really, really enjoyed this one.
Stunning stuff, to recreate chess constraints on a numpad and apply to a sudoku grid is genius, thank you Setter and Simon.
I solve this one a while ago, and I am happy to see this rule here on the channel! 🎉
What a fabulous puzzle and solve. Only thing it needed was a pause the video moment. Lol
Very fun concept and puzzle!, wouldnt mind doing more of these in the future :]
My first fully independent solve! Thank you gdp and simon
Another fun, wild and interesting rule set!
Love this variant more please GDC! And well done Simon for keeping on top of the sudoku LOL
Splendit idea. Great puzzle, much joy.
This took me 8 hours (with the middle 7 hours being mostly just staring at it over multiple days), but I did it. I did it without any help. And it was amazing.
Interesting rule set, solved in 31:14. I was expecting the bishop lines to have to be the break in after quickly discerning that they must be opposite parity, but was pleasantly surprised to discover that it was in fact the long knight line that was the most restricted, and indeed determines the parity of the bishop lines.
Wow that was an amazing puzzle. Love the rule set. Love the solve. Plaudits all round.
Needed help with the break-in about the string of legal knight's moves, but got the rest out with no problems. Lovely interaction between sudoku and chess logic!
Finished in 17:34. Seems fairly straightforward once you map out all the of the possible knights moves on a keypad.
Interesting ruleset and fun puzzle!
That is a brilliant puzzle 👏🏻👏🏻👏🏻 I loved every step of solving it. This way of incorporating chess movements was so much fun. Give us more please 😄👍🏻👍🏻👍🏻❤️
Solved in 44:26. The break-in with the giant knight line and the ending with the queen line were both hilarious.
The chess pieces jumping around on the numpad reminds me of an old XKCD comic ("Explorers", number 839). A bishop and a knight is on a 3x3 board, and they are not getting along at all.
Also, the emergent parity rules (bishops lines stay on a single parity, knights alternate parity) are quite cool.
That was so much fun! That ruleset what definitely my favorite in a long time. I focused on the puzzle as a parity puzzle for a bit too long, but it definitely helped me to make good headway at the start.
38:04 .... I'm blown away by how clever this puzzle is. I love chess constraints and this is a beauty.
One of the most fun puzzles I have ever solved. Being a chess player definitely gave me a head start knowing that the knight always alternates colors when it moves.
What a puzzle! I solved it much slower than Simon, but I'm still happy to achieve it. I haven't noticed at first the nice restriction the long knight path does and started with working around the parity of the cells from the two bishop lines. Simons combinatoric skills are unmatchable, he comes to the result with such elegance and effectiveness I can only dream about.
It is a joy to see new ideas, so the diversity of variant sudoku keeps growing. Not every idea is so entertaining as that one. I like chess and I love CtC channel . Perfect evening for an old guy like me.
20:31 finish. A fun little chess puzzle, although I don't use the number pad myself and had to keep referencing it. I color coded each side of the knight rotation from 7 to 3, making it a bit easier to see where things fit (on the knight lines, anyway). Excellent job!
The whole video i was wondering if simon would ever realize he has a number pad on his screen (on the app). turns out, no he does not. granted it might be inverted, but it still has the same layout and so the same restrictions
I actually spent some time looking at the number pad on my keyboard and the number pad on the mobile app and wondering if it mattered that the order of the rows was flipped (it doesn't).
there's an option in the app to flip the digital number pad (to the layout of a keyboard numpad).
@@droid-droidsson You can flip it but like i said, it still has the same restrictions as the uninverted version. also me being used to the univverted version, i would be missclicing a lot.
i can rarely solve these but after watching simon figure out the break-in with the knight line i got the rest on my own! very fun
I finished in 71 minutes. This ruleset took me some time to figure out, but I feel like I picked up on a lot of its tricks. Bishops always have to be odd or even. Knights can't have 5s on them and cycle through 8 numbers unless able to turnaround. Knights alternate between odd and even. Pawns of three length in a row must always have the center digit be from the center row. Rooks need an even digit as a transfer junction to get to 5. I'm excited to see what others do with this ruleset, because this feels very malleable with other rulesets. Great Puzzle!
Introducing Harry Styles into a chess-themed Sudoko with a "one direction" pun was genius.
I didn't get the pun until you explained it just now, so thank you.
12:47 for me. What a fantastic idea, maybe it's not for everyone, but I personally loved it. Great puzzle!!
Great puzzle and solve Simon! I think it would be cool if you could let us know how difficult you feel each puzzle is out of 5 stars after you've solved them? This might be a nice interesting addition to the closing of each video.
Such a fun puzzle! I really enjoyed this mechanic.
50 min, that flowed really well considering I had no clue where I was going to start when I looked at the puzzle.
13:20 "This could be different or the same as this digit" In a vacuum, maybe, but since you already have the other 26 in that box from the other end of the sequence it's forced...
I’m so happy! This is the first sudoku from this channel I’ve ever solved. I’m a chess master so I really wanted to try my best at a “chess” sudoku. Why does this feel so exhilarating? Lol
I forgot to say but it ended up taking me an hour and a half
Congratulations. It is a great feeling, isn't it. Not the easiest, for your first solve!
Congratulations! And don't worry about time. Simon just makes everything look so much easier than it is 🙃
I really adored this puzzle. I hopped on the parity train from the start, beginning with the zig-zag Bishop line. I determined with ABCD analogues that it could not be an "even" bishop line, which followed that the adjacent bishop couldn't be odd, which pointed to the rook line as being comprised of all odds.
I enjoyed starting there because it made the unfolding of the long knight line even more satisfying as I already had a bunch of pencil marks above to be unraveled with the precocious pairs that the knight pointed to.
Just great fun.
Absolutely loved that one
20:55 for me, very happy with my solve. Played a good amount of chess in my life which helped; the main thing for me was finding the long knight line break in almost immediately (realized there could only be one sequence that landed you on 7 for the 8th digit in the sequence) and the rest flowed from there. Really cool idea and a very fun puzzle!
Fun and surprisingly light for me. Took a bit of experimentation after discerning the five numbers on a line in R6, but smooth sailing after that. A rare win over Simon. 29:19.
Simon, I recommend using the numpad when you do sudoku. Also, you can enter corner marks while holding shift, and you can enter central marks when holding control. That way you don't have to press a key multiple times to enter a digit.
If you ever do a puzzle with this rule set again, you can illustrate the moves each piece can make by just clicking in any of the 3×3 boxes. For example, click on cell 8 of one of the boxes, and then you can click on cells 1 and 3 to see how a knight can move. This might be easier than looking at the number pad or even the numbers over on the side in the software and having to mentally visualize it. The top and bottom rows will be swapped, but that doesn't affect the solve.
“You… Shall Not… PASS!”
Can't wait for your LOTR hunt!!
Stratospherically beautiful construction and stratospherically masterful solve.
👏👏👏👏👏👏👏👏👏👏👏👏
Thank you *gdc* and *Simon*
This is a fantastic idea for a puzzle!!
The knight lines becoming a more restricted german whisper lines is so interesting
21:05 for me, loved how the queen line came into play
found this one pretty easy, I found it easier if you color the squares. finished it in 72:18. Could have finished it quicker, but I made it a point to finish the coloring before finishing the puzzle
I solved it, but I had to restart once, back track twice more, mostly for stupid reasons. One, I have been doing so many orthogonal rules in puzzles lately that I forgot that kings can move diagonally, lol. Two, I tried using coloring to help with determining odd cells, but because I kept forgetting the king could move diagonally, I kept ruling the 3 off that line, and that made my coloring wrong. It did lead me to the cell I had to focus on, because it was one cell in particular that kept breaking the puzzle, but even from there, I'm not sure what my third mistake was, but I backtracked all the way to the part that I had finally knew was correct and took a different path forward which prevented the same mistake and I got there. Longer than I care to admit, but I solved it, none the less. Thanks for a fun morning diversion.
Wow! How did Simon see that chain (on the long knight line) at the beginning so quickly??
Loved this! I felt like I was down the rabbit-hole in Wonderland, playing a weird sudoku with Alice, the Mad Hatter, the White Rabbit, etc. It was great how the stalwart pawn plodded his way straight ahead, from 2 - 5 - 8, breaking open the rest of the puzzle. There is so much room for exploring & developing this rule set. I'm looking forward to this rule set in a FOGGY landscape. Lewis Carroll (Prof.Dodgson) would approve. Beware the Jabberwock, my son!!!
thanks! I published another puzzle called "royal romans in the fog" shortly after this one. I suspect you might like it.
47:43 for me today and without any help from the video! Quite a pleasant solve and a very unique idea!
17:32 "So these are all even digits, this is going to turn into a parity puzzle" - I wondered how Simon only now noticed the parity. A bishop is staying on its parity, while a knight (and pawn) is always switching parity, this is how I started it.
37:29. Took me a while to see what was going on with the 7 in box 2, after that it was a pretty smooth solve.
You can get a lot of info out of odd/even colouring with this ruleset, since bishops keep the same parity and knights alternate parity.
I solved the puzzle with a lot of usage of coloring the parity, two interesting observations are that knights always change parity and bishops always have the same parity. That gave me a few free digits, for example I deduced that r7c3 was odd so r7c4 must be even and I had already used all three other evens in column 4.
Intriguing puzzle. I ran into an issue because I accidentally reversed the 6 and 8 in box 2, because I didn't double-check the number pad before filling them in. Fortunately, once I discovered that and fixed it, I was able to re-use most of the logic that I had discovered before to get back to where I had been. My time was 34:37, solver number 6228.
Shouldn't Simon be able to see the layout of the numbers on his screen, by looking at Sven's input panel? There was no need to keep looking down at his number pad on his keyboard.
Was going to comment the same thing….
He might have his video recording covering that bit?
@@AaronSmith-i8y Possibly for this video, but for others where he uses the pen tool he would need to be able to see it, so he obviously can see the number pad sometimes at least.
45:53, that I took to coloring odds and evens and it worked is super impressive.
I didn't have a screwup with the kings line in box 6, after learning it had to go from 7 to 4 or 9, I started treating it as only able to move orthogonally and ruled out too many digits from r5c8.
Note that in the software, although the numbers are a mirror of the numpad, the number grid there is effectively identical to the numpad, so Simon didn't HAVE to look down for it.
26:28 ... Checkmate!
Nice puzzle!
This one really played with my head, and I felt my solve, while fully logical, was pretty sloppy - Simon's solve was much smoother and cleaner! 🙂 Finished in 40:24 (conflict checker off), many thanks to gdc for an amazing puzzle!
30:42 "box 4's been filled in"
Me: *waiting for Simon to notice which box 5's must be in on line 6 for about 25 minutes now*
Fun puzzle. As almost always I solved it partially with the help of Simon.
yeah, really enjoyed it, maybe my fav sudoku yet!. quite sad i made some simple mistake and had to go back 20 digits, but it's still quite a great concept to look at the pieces in the keypad context
It would help if the num pad was shown the whole time in the video.
I would say the knight line would be the most interesting to have as a "basic rule"
Adding all of them would probably need too much explanation all the time and most of them don't really feel as restricting
But who knows
I did use parity coloring when solving. It nearly screwed me up because the first rook line you think about is all one parity but of course this does not mean that rook lines can never have digits of both parties, just that a certain parity must always have a buffer between them on the line.
Instead of limericks, now I choose
To rhyme a rhyme like Doctor Seuss.
To speak Iams in rows of four
And thus a new form I'll explore.
Till today I have not ever
Seen a puzzle quite so clever
As this chess sudoku grid.
I'd remember if I did.
Twas a little scarity
Till we saw that parity
And patterns came along to guide us
Bringing answers from inside us.
Fingers dancing, keyboard blazing,
Simon once more proved amazing,
Brimming with such mental power,
Coming in below an hour!
Now the puzzle has been done through.
We al had a lot of fun, too.
While we all were donut snacking,
As we did our cryptic cracking.
From Fnaire and I (the Ma and Pa)
Kids, grandkids and kids-in-law,
Simon, you've our thanks and praise.
They'll be back in seven days.
The pawn is restricted from being totally harry styles esque 😂 a one direction joke I didn’t see coming
Got it in 73:02. Ive been watching since a few years but never tried a puzzle. This was the second one that I was able to solve
finished it in almost one straight hour, this puzzle does make you think, but, it is still accessible if you go at it step by step
Loved it! Only took me 2 1/2 hours! Thank god ctrl-z works.
As soon as I saw these rules, a related ruleset popped into my head for which I can already see some interesting bits of logic even without a concrete puzzle in front of me… but I suspect I don't have the spoons to build a human-solvable puzzle on it.
21:56 for me. quite easy for a new rules set.
Always appreciate a Black Adder reference :)
Beautiful puzzle! Not too hard either, when you know your chess moves that is. Either way, I would recommend it to everyone!
This took me 121:51. (Solve-Counter 4217.) While I pencil-marked (and parity-colored) most of the lines early, and then used some coloring and lettering to progress somewhat, I forgot for a long time to re-check the lines for eliminating more options, after some information was found.
I noticed again that my number-pad is vertically mirrored to the one in the app, i.e. the 9 is in the upper right corner, not the lower right (but fortunately this doesn't change the rules).
I colored even and odds. A knight move always changes chirality and bishop need to keep chirality, easy way to see that bishop line was odd, and then the other one had to be even because odd would break the rook line.
I agree that coloring could be helpful here. But I think parity is the more commonly used term for distinguishing even and odd, not chirality (for which I couldn’t find a number theory definition).
28:10
This was brilliant once I'd remembered the orientation of a number keypad 😂
Posting information about the upcoming LOTR puzzle/launch on some LOTR related sites on Meta, etc might be welcomed!
Now there will probably be one setter evil enough to make a puzzle with chess lines where Simon will have to deduce to which piece each line belongs. With one line being wrogn.
EDIT: OHHHH I am missing something... This comment is WRONG.
King can move from 4 directly to 2.
So ignore.
8:20 It would be more helpful to you if you spotted that you have an X-wing on fives in boxes 4 and 5. Thus eliminating 5 from R5C7. And so the next cell in the king line is from 179 and the final cell on the king line is from 4268.
This because the king line cannot have a 5 on it because of the x-wing. So the king line alternates between odd and even digits. And it cannot reach the digit 3 in three moves from 7.
Here's a list of possibilities. starting in R5C7.
478
874
412
896
The king will do one of those moves in that exact order.
Complicated, but quite interesting!
A 7-cell sequence of knight moves? Someone call Bob Seger!
"we'd only be allowed to do pawn moves..." 😂😂😂