Author: GuyHaworth
Date: 17:39:47 07/03/02
Go up one level in this thread
Let us suppose you are trying to pick up the (depth of) wins for White. a) you are looking at a btm loss for Black: backing this up to a wtm position, you must be looking at a win for White. You can give it a 'provisional' depth of d+1 - but be prepared to reduce this depth if one of its successors turns out to be a quicker win ... later in the algorithm. This is possible with DTM(ate) EGTs but not DTC. b) you are looking at a wtm win for White. Backing this up to a btm position is fine - but you now _must_ check all successors of that btm position to make sure it is a forced loss for Black. Ken Thompson had a 'counting down the number of successors' idea - but found it was not efficient. g
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