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Simplify pruning moves with negative SEE

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This patch simplifies pruning moves with negative SEE values.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 18847 W: 4211 L: 4084 D: 10552
http://tests.stockfishchess.org/tests/view/5de983f2caa7c610e4d1866e

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 25556 W: 4200 L: 4087 D: 17269
http://tests.stockfishchess.org/tests/view/5de99e21caa7c610e4d18676

Bench 5390930
This commit is contained in:
protonspring 2019-12-06 08:56:17 -07:00 • committed by Stéphane Nicolet
parent a6b5ba1b64
commit 78eeba29a2
1 changed files with 1 additions and 3 deletions
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4
src/search.cpp
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@ -1478,9 +1478,7 @@ moves_loop: // When in check, search starts from here
&& !pos.capture(move);
// Don't search moves with negative SEE values
if ( (!inCheck || evasionPrunable)
&& !(givesCheck && pos.is_discovery_check_on_king(~pos.side_to_move(), move))
&& !pos.see_ge(move))
if ( (!inCheck || evasionPrunable) && !pos.see_ge(move))
continue;
// Speculative prefetch as early as possible