Source: Mr. Bridge
ONE of the problems that the improving player struggles with is when a bid can be passed (non-forcing) and when it can’t be
passed (forcing). In general, ‘new’ suits are forcing and ‘old’ suits (support, or preference) are limit bids showing the strength of the hand. Also, there are some situations where you mustn’t pass, otherwise a game or slam will be missed.
This is a situation I see people get wrong quite often:
You have:
K J 8 7 
Q 3 2 
7 6 5 4 
J 7
Partner opens 1 and you respond 1, (ignoring the poor diamond suit); partner rebids 2; what now?
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