[couchbaron]

On Hand 8 from ACBL Robot Duplicate #5866, I held:

AK2 53 AK43 9865. The auction went 2H on my left, around to me. I doubled, and partner left it in, but RHO ran to 3C. I hit that and led the diamond ace. Dummy was 87 KJT974 J865 K. For reference, my robot partner's hand was T9543 AQ862 9 Q7. I led the diamond ace. I could have beaten the contract 2 very quickly by continuing diamonds, but I shifted to a trump. Declarer won in dummy, played a *low* heart, covered with the 8 and ruffed, then drew trumps before playing on diamonds. I won the third round and exited with a fourth to dummy, so declarer had no play -- except my partner pitched the 10 AND 9 of spades. No bridge reason; no earthly reason. and it was the difference between +100 and -470.