Author: David B Weller
Date: 13:51:05 01/30/06
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When a move fails high, check the null-move search on that same position to see if it fails low (using a lowered window for safety). If it fails low, something is up here as playing move X fails high, standing pat fails low, so probably move X is holding off some serious threat by the opponent. Extend and search again to see if you can now see what is happening with the increased depth. So, set flag if NM fails low by a certain margin then later, while searching real moves, if *any* one fails high && flag was set by NM earlier, research node with extended depth Have I understood this correctly? If this is correct, I am still a little unsure of what this actually describes in a game tree. What does the fail high prove/indicate? BTW, where might I find older Crafty Sources?
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