Responses to 2

2 GIR, weaker than 2NT 2/ To play - no interest in further competition. 2NT GF (13+ HCPs) with responses: 　 3/ = Maximum + Singleton-/ 　 4/ = Maximum + Void-/ 　 3 = Minimum with 55-shape 　 3 = Maximum with 65-Spades 　 4 = Maximum with 65-Hearts 3/ NNF 3/ Pre-emptive

Interference over 2

All Major suit bids (except 4) are correctable

Double shows a good defensive hand and invites Opener to cooperate in further bidding.