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6.22 R7C3 is 8, 12.02 R4C1 or R4C2 is 1 eliminating 1 from R4C8 resulting in 23 and same in R1C8 eliminates 3 from R5C8 resulting in 5 and the puzzle collapses
![[Eng] Position Sums Sudoku, by Richard Stolk](http://i.ytimg.com/vi/KqwKInSUkJk/mqdefault.jpg)
6.22 R7C3 is 8, 12.02 R4C1 or R4C2 is 1 eliminating 1 from R4C8 resulting in 23 and same in R1C8 eliminates 3 from R5C8 resulting in 5 and the puzzle collapses