2/1 (j) Defense Signals(防禦信號)。楊昌彪主講

簡易二蓋一叫牌制(2/1, Simplified Two over One)
楊昌彪教授整理與主講。下載網址：par.cse.nsysu....
涵蓋特約如下：
(1) Inverted minor (低花反序)
(2) New minor forcing (新低花迫叫)
(3) Support double & support redouble (支持賭倍與支持反賭倍)
(4) 4th suit game forcing (第四門新花迫成局)
(5) Forcing 1N (to 1H/1S) (迫叫1N)
(6) Jacoby 2N (傑可貝王牌四張支持)
(7) Bergen raise (柏根王牌四張支持)
(8) Splinter: 4+card support with at least one honor (斯普林特單缺)
(9) Lebensohl (雷本索)
(10) DONT (Disturbing Opponents' No Trump，干擾敵方無王)
(11) RKC 1430 (Roman Key Card問A)