LEARNING CENTER

In #1 and 2, Opener's second bid is invitational. In #3, Opener shows a big hand, but who is to say Responder doesn't also have a big hand with intention to head towards slam? In #4, opener has limited his hand and responder has placed the contract. There is no possible hand opener can have to bid again.

In #1, Responder can have anything and surely might bid again. In #2, 2 is not forcing, but the auction can continue if opener has extras. In #3, opener showed a big hand, but Responder might also have a big hand and certainly can bid again. In #4, the 4 bid has to end the auction; there is no hand responder can have to warrant further action.

In #1, Opener should not bid again. 3 is an absolute signoff (just furthering the preempt). In #2, Responder's 2NT asked for further description. Opener showed a minimum, but Responder could be bidding again anyway. In #3, 2 is forcing (playing standard). The player who bid 2 could have a huge hand and might bid again. In #4, Responder's sequence offers a choice between 3NT and 4.

In #1,Opener shows a big hand and Responder is unlimited and could bid again. In #2, Responder's 3NT after a preempt is a complete signoff (if he wanted to offer a choice, he needs to bis 2NT first). In #3, Responder's sequence shows game interest; Opener could bid again. Opener's 3 in #4 is invitational with at least 5-5 in the red suits.

In #1, Opener can take a preference back to spades. In #2, Opener has shown 12-14 balanced and Responder has placed the contract in 2S (Opener must pass). In #3, Opener can have a nice hand with extras, maybe 3=1=5=4 and bid 3S. In #4, Opener's jumpshift is GF, so responder's 3S can't be passed.