Author: Robert Hyatt
Date: 18:34:17 01/23/01
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On January 23, 2001 at 14:59:40, Severi Salminen wrote: >Hi! > >I want my engine to also solve these mate in 3871 positions fast :) So: how do >you guys extend if there is only one legal reply in node. Obviously you have to >check the legality before trying that move. So do you allways when the king is >in check check the legality of all moves and if that results one legal move you >extend? Are there another ways to do this? > >Severi I do this, yes. Because if you know you are in check, most of the moves a normal move generator will produce are illegal. It is faster to simply not generate them. This has the added convenience of giving you a real easy way of detecting the case where you have only one legal move so you can extend. I didn't do this in Cray Blitz so there is an alternative. Do the normal search, but each time you search a legal move, inc a counter. When you are done searching all moves, if the counter == 1, there was only one legal one to search. Search it _again_ but one ply deeper...
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