[shyams]

http://tinyurl.com/y37kegrq
The situation after trick 8 was

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I (South) led ♥3, dummy played ♥J and North played ♥8 instead of ♥Q. Result: -3 doubled instead of -4 doubled.

This post is not about the so-called stupid play by North. As South, I defended it very badly as well. The GIB's play begins to make sense because from North's perspective all plays are equal; it expects me to hold ♥43 ♦2 ♣JX and declarer to hold ♠KQ84 ♣X.

My suggestion is simply whether GIB can be trained to play the highest affordable card when it knows all plays are equal. Here the play of ♥Q is zero cost if the layout is as the North GIB expects it to be but with positive payoff if I really held a doubleton ♥. This becomes especially relevant when partner may have been squeezed for options in the bidding due to the opening preempt by opponent.

[shyams]

PS: This was Board 2 of the "Free Daylong tournament (MP) - 2019-03-14"

[johnu]

I see no point in trying to invent a reason to give credit to GIB for making a hopeless blunder.