gnasher's explanation is the best I've seen. Treat the cards that opps knew would never matter (below the low card in dummy) as a different suit than the ones above it. So for the original post, you're evaluating the cards being 3-3 or 4-2. Those are your only options. There are 20 possible 3-3 splits and 15 4-2 splits, so the final higher card being on our right is favourite - 20 of (20+15) times.
gnasher's explanation is the best I've seen. Treat the cards that opps knew would never matter (below the low card in dummy) as a different suit than the ones above it. So for the original post, you're evaluating the cards being 3-3 or 4-2. Those are your only options. There are 20 possible 3-3 splits and 15 4-2 splits, so the final higher card being on our right is favourite - 20 of (20+15) times.
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