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Prune evasions when we can castle 

A minor simplification.

STC:

LLR: 2.95 (-2.94,2.94) [-3.50,0.50]
Total: 67877 W: 12882 L: 12904 D: 42091

STC:

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 20677 W: 4023 L: 3901 D: 12753

LTC:

LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 12221 W: 2022 L: 1888 D: 8311

Bench: 7911336

Resolves #326
pull/327/merge
lucasart 2015-04-04 08:00:15 +08:00 committed by Joona Kiiski
parent 2ca142a5b4
commit aaf17326e2
1 changed files with 1 additions and 2 deletions
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3
src/search.cpp
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@ -1302,8 +1302,7 @@ moves_loop: // When in check and at SpNode search starts from here
// Detect non-capture evasions that are candidates to be pruned
evasionPrunable = InCheck
&& bestValue > VALUE_MATED_IN_MAX_PLY
&& !pos.capture(move)
&& !pos.can_castle(pos.side_to_move());
&& !pos.capture(move);
// Don't search moves with negative SEE values
if ( (!InCheck || evasionPrunable)