Posted 2019-October-20, 10:29
Honestly, I think a lot of the criticism of a 4♠ bid here is rather unreasonable. Partner doesn't need to hold 5 spades, 3 will suffice. Your spades are sitting behind the A♠ or opposite the A♠ 90% of the time, possibly more if your opponents religiously don't preempt with an Ace. And, in fact, you just make 4♠ opposite KQ♦ and a singleton club when your partner holds a few spades and the A♠ is onside.
Contrary to some of the cherry-picking in this thread, I don't think that hand would bid over 3♣, and yet it still makes. Our singleton heart is valuable, and JTXX of diamonds is an asset on this auction. The A♣ is most likely going to earn us control of the hand at Trick 1, and if a heart lead comes at Trick 1, that's pretty good too!
The real concern with bidding 4♠ here, even though I advocate for it, is the singleton diamond lead that will come more often than we'd like. Small diamond to the A♦ and a ruff is breaking our back here a lot. That being said, down 1 is a good save, as long as partner does have a hand that can keep it to down 1.
Partner figures for some amount of spade and diamond length, and probably a doubleton club. We can count at least 8 hearts, and 9 (turns out it's 10) clubs between our hand and the bidding of EW. And, there's no reason to suppose that either of EW have a void in their partner's suit. Partner really just figures for a pointy suit holding here, but, if they're holding 6 diamonds and 2 spades? That diamond ruff looks pretty likely now. That being said, the odds of holding 5 points in spades also go down dramatically, leaving increased odds of the A♦ being in partner's hand.
Lastly, if you had X, AKQXXXX, AX, XXX, you would totally prefer 4♥ over 5♣ as a contract. So, I disagree with you on that one Cyber, I don't think it shows club shortness. But, I do think the hand that bids 4♥ will often have club shortness. I don't think this bid definitively promises nor denies clubs, it just says, I have good hearts and this contract is better.