Author: Andrew Platt
Date: 06:19:00 09/03/04
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On September 03, 2004 at 08:46:08, Uri Blass wrote: >>It would be too expensive for me to really deal with checks in qsearch because I >>don't want to have to generate the legal capture modes. All I do is bomb out of >>it if I see the King being captured. However, it might not be too expensive to >>generate the legal moves at the first ply of qsearch if we're in check to catch >>these conditions. I might try that and see if it causes testsuites to slow down >>much. >> >>Andy. > >You do not need to do it. >If you extend every check by 1 ply in correct way there is 0 chance to get >position when the king is in check in the first ply of the qsearch. You're right. Late nights analyzing plies of trace data do strange things to the mind! The real situation I was seeing was a standard horizon effect exacerbated by null move. With null move I don't see Rh8# and extend for a mate threat if I don't have enough depth to call alpha-beta from the null move since the qsearch doesn't generate non-capturing checking moves. Andy. Andy.
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