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A GIB inference?


Antrax

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[hv=pc=n&w=sat92hakt83da3cqj&e=skj854hq74djt7c62&d=w&v=b&b=4&a=1hp2hp4hppp]266|200[/hv]

North leads a trump. S has J962. If S produces the J on trick 1, declarer wins, plays two more rounds ending in dummy, crosses to the A, draws the last trump and finesses N successfully for the queen, making +1.

If S ducks the heart or plays the 9, declarer again draws 3 rounds ending in dummy, now crosses with the A, draws the last trump and plays a spade to the K and finesses S for the Q, down 1.

Basic GIB which explains why it touches the diamond A at all instead of finessing some way and ensuring a make (it assumes it will always pick up the Q) but I can't figure out why South's play to trick 1 is relevant, I'd think once the trump situation is known it doesn't change declarer's play what S did in the past.

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