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Was West's raise a mistake? **
W/All   
Q J 10 8
windroos7 2
A J
K Q 7 3 2
A J 7
4
A 8 7 3
K Q 9 6 2

WestNorthEastSouth
1NTpass2pass
2pass3pass
4pass5pass
passpass  

Playing matchpoint pairs EW end up in the wrong game.

East makes 11 tricks in his 5 contract (NS start off cashing the AK) but +600 gives EW a bottom. Virtually all other EW-pairs bid 3NT and effortlessly they make 11 tricks as well, scoring +660. Even if NS had not started cashing the AK against 5 — East would have made 12 tricks then, scoring +620 — EW would have had a bottom.

East: 'Why didn't you bid 3NT over 3? After all, you have guards in diamonds and spades.'
West: 'I thought you were interested in a club slam, that's why I raised your suit.'
Who was wrong?

Solution

One could say that this is a matter of agreement.
But practice shows that in most cases it is pointless to introduce a minor suit opposite a notrump opening as a possible trump suit for game (but: if responder considers a slam there's nothing wrong with a minor suit!). In the great majority of cases 3NT is a better game than five in a minor.
A club bid like East's should be reserved for slam purposes, therefore. East bids like this if he thinks a slam might be on opposite a fit in West's hand.
West's raise to 4 was correct, since in view of the bidding he has got about the best hand he can have.
(Aside: interchange West's diamonds and spades: 6 is on despite East being too weak for his slam try. This brings us to West's pass over East's inconsistent 5 bid (inconsistent since he first tried for a slam with 3 and then, after West's positive 4 bid, signs-off in game). In view of his superhand to West an undisciplined raise to 6 was certainly an option. After all, East did make a slam try. If NS fail to take their two spade tricks, EW will score very well, whereas in playing 5 they usually will not. And if NS do take their spade tricks, down one in 6 will not score much worse than making eleven tricks in 5...) 

East would have done better by bidding 3NT instead of 3, giving West a choice between passing and bidding 4.

PS: Some will disagree; they want to be able to bid 3 on a hand without slam potential (for it is true: once in a while 5 is better than 3NT and somewhat more often 4 in a 5-2 fit is superior to 3NT). They should agree that if East was only interested in finding the best game, he should be able to bid 4NT over West's 4 as the final contract. So 4NT is not Blackwood then. If East is interested in a club slam, he should, over 4, show a control with 4, 4 or 4.

 

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