[calm01]

http://tinyurl.com/6qj4kar

[manudude03]

calm01, on 2011-December-12, 06:58, said:

http://tinyurl.com/6qj4kar

I guess it knew it had a natural trump trick lol. Meanwhile, declarer butchered the hand too (just win the ace, ♥KA and run the ♣Q, surely that lead was singleton....)

[barmar]

That play doesn't work, although I didn't see it myself, either. I asked a better player, and he saw why.

South doesn't cover the ♣Q, and North ruffs. There's now only 1 dummy entry, but clubs aren't good yet, so there's still a spade loser in hand.

DD analysis says it's always down 1 on a ♣ lead.

[barmar]

However, I agree that that would be the correct way to play the hand. If South has the long trump along with the ♣K, the contract makes with an overtrick, while ducking goes down 2.

Was this MP or IMP? I did some tests, and it seems to play A at IMP, Q at MP. The basic problem is that it doesn't make the inference that the lead is a singleton.

[Bbradley62]

IMPs.

This failure to ruff is more bizarre and more costly:

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