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Simplify endgame factor for opposite colored bishops

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Stockfish is continually improving. Patches that gain elo in the past may
no longer be needed as stockfish improved elsewhere. This patch removes
passed pawns count dependence in opposite colored bishops scale factor.
We used the mean of passed count pawns (~1.4) to compensate, and changed
the base value from 16 to 22.

Passed STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 57879 W: 12657 L: 12607 D: 32615
http://tests.stockfishchess.org/tests/view/5dd1644f42928ff08153dc1e

Passed LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 121648 W: 19622 L: 19659 D: 82367
http://tests.stockfishchess.org/tests/view/5dd24572ccb823d41d4b47bb

Closes https://github.com/official-stockfish/Stockfish/pull/2419

Bench: 5067864
This commit is contained in:
SFisGOD 2019-11-21 03:31:23 +08:00 • committed by Stéphane Nicolet
parent 3f4191392c
commit 1fdf1f1ff5
1 changed files with 1 additions and 1 deletions
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2
src/evaluate.cpp
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@ -748,7 +748,7 @@ namespace {
{
if ( pos.opposite_bishops()
&& pos.non_pawn_material() == 2 * BishopValueMg)
sf = 16 + 4 * pe->passed_count();
sf = 22 ;
else
sf = std::min(sf, 36 + (pos.opposite_bishops() ? 2 : 7) * pos.count<PAWN>(strongSide));