ArcLight, on Aug 22 2007, 11:16 AM, said:
Something like: (give or take a heart, and maybe add the club Q, with enough clubs, you can play for the drop)
♠ x
♥ x x x x x
♦ x x x
♣ K x x x
It will certainly miss some slams to overcall 4♠, no one denies that. But the examples of partner having Kxxx of clubs and out are silly. Apart from the fact that slam isn't even cold, and apart from the fact that it is only one out of millions of hands partner can have, how is anyone bidding slam anyway? Even if the auction is just at 3♦ when it comes back, which is hardly unlikely, now you want to bid 4♣? Doesn't this sort of leave 7 solid spades on the shelf, especially when now they are very likely to bid to 5♦ and you haven't got a clue whether or not to bid 5♠. And even if partner raises your club bid you haven't got a clue whether to go on to slam or not. Meanwhile if the auction is at something more like 5♦ when it comes back, you are the one with the major guess instead of the opponents. I still think it is wishful thinking to ever hope to get the chance to describe this hand.
All that being said, if I had overcalled 1♠ anyway and been fortunate enough to see the auction go X p 1NT back to me (as in real life) it is clear to me the best rebid isn't 4♣ (a bid which totally under-emphasizes the spades - partner will pass with 1552), it is 2♣. There is a 0% chance the auction will end, and now we have real hopes of finding out what we need if we leave ourselves the room. It may also let the opponents get their bids off their chest at a lower level and let us buy it in 4♠.

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