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Simplify SEE Pruning (#2191)

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Simplify SEE Pruning
Note this should also be a speedup...
If givesCheck is extended we know (except for DC) that it will have a positive SEE. So this new logic will be triggered before doing another expensive SEE function.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 24429 W: 5484 L: 5368 D: 13577
http://tests.stockfishchess.org/tests/view/5cffbccd0ebc5925cf09a154

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 28428 W: 4873 L: 4765 D: 18790
http://tests.stockfishchess.org/tests/view/5d0015f60ebc5925cf09acb1

Bench: 3897263
This commit is contained in:
VoyagerOne 2019-06-14 13:59:17 -04:00 • committed by Marco Costalba
parent 8cfe27b765
commit 46ce245763
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -980,7 +980,7 @@ moves_loop: // When in check, search starts from here
if (!pos.see_ge(move, Value(-29 * lmrDepth * lmrDepth)))
continue;
}
else if ((!givesCheck || !(pos.blockers_for_king(~us) & from_sq(move)))
else if ((!givesCheck || !extension)
&& !pos.see_ge(move, -PawnValueEg * (depth / ONE_PLY))) // (~20 Elo)
continue;
}