Author: Joachim Rang
Date: 05:16:21 04/17/04
This position is an easy mate in 4: [D]6Q1/8/8/7k/8/8/3p1pp1/3Kbrrb w - - 0 1 Certain engines however have problems to see the mate and return instead a draw score. So ie Crafty. I think it is related to nullmove, since the solution involves a zugzwang for the black side and since it's so many material on board most engines will use nullmove in this position. However I thought Nullmove will produce a reduction rathern than a complete cutt-off and hence the solution should be found a few plies later. Or did I understand the mechanism of Nullmove wrong? I know that this position is not of any interest if it comes to playing strength, but it is rather funny to watch certain engines reach depth 20 quickly while being unable to spot the mate. regards Joachim
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