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SEE Pruning Tweak (#2183)

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Don't SEE prune any check extensions

STC (yellow):
LLR: -2.96 (-2.94,2.94) [0.50,4.50]
Total: 129934 W: 29390 L: 28905 D: 71639
http://tests.stockfishchess.org/tests/view/5cf6b1a70ebc5925cf08dedb

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 102115 W: 17692 L: 17224 D: 67199
http://tests.stockfishchess.org/tests/view/5cf830710ebc5925cf090331
This commit is contained in:
VoyagerOne 2019-06-09 08:27:50 -04:00 • committed by Marco Costalba
parent 2d06d659c0
commit 6ed81f09ff
1 changed files with 2 additions and 1 deletions
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3
src/search.cpp
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@ -984,7 +984,8 @@ moves_loop: // When in check, search starts from here
if (!pos.see_ge(move, Value(-29 * lmrDepth * lmrDepth)))
continue;
}
else if (!pos.see_ge(move, -PawnValueEg * (depth / ONE_PLY))) // (~20 Elo)
else if ((!givesCheck || !(pos.blockers_for_king(~us) & from_sq(move)))
&& !pos.see_ge(move, -PawnValueEg * (depth / ONE_PLY))) // (~20 Elo)
continue;
}