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Refine scale factor of opposite colored bishops endgames.

Browse source 
This patch makes it dependant on the count of passed pawns of
the strong side instead of 22/64 in every case.

passed STC
https://tests.stockfishchess.org/tests/view/5ead60966ffeed51f6e32591
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 50336 W: 9473 L: 9241 D: 31622
Ptnml(0-2): 570, 5371, 13098, 5515, 614

passed LTC
https://tests.stockfishchess.org/tests/view/5ead6d3b6ffeed51f6e325b0
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 21952 W: 2810 L: 2603 D: 16539
Ptnml(0-2): 101, 1791, 7005, 1958, 121

closes https://github.com/official-stockfish/Stockfish/pull/2658

bench 4247490
This commit is contained in:
Vizvezdenec 2020-05-02 16:45:20 +03:00 • committed by Joost VandeVondele
parent 7f8166db89
commit eb4a124b88
1 changed files with 1 additions and 1 deletions
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2
src/evaluate.cpp
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@ -768,7 +768,7 @@ namespace {
{
if ( pos.non_pawn_material(WHITE) == BishopValueMg
&& pos.non_pawn_material(BLACK) == BishopValueMg)
sf = 22;
sf = 18 + 4 * popcount(pe->passed_pawns(strongSide));
else
sf = 22 + 3 * pos.count<ALL_PIECES>(strongSide);
}