I've been playing bridge a long time, but stopped from 1998-2009. Over 1m 1M NT, 2c is checkback stayman showing 10 plus points a five card major and is a one round force. Over 1c 1M 2c, 2d is NMF and played the same as checkback. (I thought this was called NMF, but found out it isn't) 1D 1M 2D, 3C is the same but requires a better hand. We play 4SF as game forcing