AUCTIONS AFTER A WEAK JUMP OVERCALL

New suit bidForcing, unless the opponents have intervened or unless opener's Weak Two was in third seat after two passes.
Any raiseTo play, possibly pre-emptive. It's never Minorwood.
2NTnatural and strong, inviting 3NT
Unnecessary jump shift up to Splinter LevelSplinter, agreeing partner's trump suit and showing a small singleton or void. Splinters are normally game-forcing, but if two of them were available then the lower is merely invitational, e.g. 1C 1S 3D/4D are both splinters, since 1C 1S 2D would have been a reverse.
3NTTo play
4NTBlackwood, even if partner's suit's a minor
Jump shift to Blackwood LevelExclusion Blackwood
Jump shift to Grand-Hunting LevelComplete two-suiter. If the partnership had previously bid more than one suit and so there's ambiguity about which suits are being promised, then the other one is the first-bid suit of the player who just jumped.
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Copyright 2015 Finn Clark.