[gjfeldman]

I was playing in a 3-robot, best hand tournament and ended up in a 6NT contract. When the dummy came down I could see that I had 2 potential problems: I was missing the K♦ and the A♥. If the ♦ fineness succeeded, I could make the contract without playing any hearts, but if it failed, I needed either the Q♥ or K♥ to make the contract. The fineness failed. So I was left with the heart Qx in the dummy and the K in my hand. I led low from the dummy. Almost every human player would gleefully slam down the ace, defeating the contract. Bit the robot was well taught to not play an ace ahead of a K or Q. The robot ducked and I cashed the K and discarded the Q on a diamond to make the slam and a 95% rated hand.