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Tweak of SEE pruning condition

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passed STC
http://tests.stockfishchess.org/tests/view/5d386bda0ebc5925cf0ef49a
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 56874 W: 12820 L: 12373 D: 31681

passed LTC
http://tests.stockfishchess.org/tests/view/5d38873a0ebc5925cf0ef86e
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 43512 W: 7547 L: 7247 D: 28718

Additional thanks to @locutus2 , @miguel-l and @xoto10 for fruitful discussion.
There may be some more elo there since this tweak was the first one and numbers
are more or less arbitrary.

Closes https://github.com/official-stockfish/Stockfish/pull/2256

Bench 3935523
This commit is contained in:
Vizvezdenec 2019-07-24 17:30:59 +03:00 • committed by Stéphane Nicolet
parent 33c3a04653
commit acdda38b93
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1041,7 +1041,7 @@ moves_loop: // When in check, search starts from here
continue; continue;
// Prune moves with negative SEE (~10 Elo) // Prune moves with negative SEE (~10 Elo)
if (!pos.see_ge(move, Value(-29 * lmrDepth * lmrDepth))) if (!pos.see_ge(move, Value(-(31 - std::min(lmrDepth, 18)) * lmrDepth * lmrDepth)))
continue; continue;
} }
else if ( (!givesCheck || !extension) else if ( (!givesCheck || !extension)