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Re-introduce "keep pawns on both flanks"

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Re-introduce the "keep pawns on both flanks" idea.

STC yellow:
LLR: -2.95 (-2.94,2.94) [0.00,5.00]
Total: 93279 W: 20175 L: 19853 D: 53251
http://tests.stockfishchess.org/tests/view/5b8a00370ebc592cf274916a

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 11440 W: 1960 L: 1792 D: 7688
http://tests.stockfishchess.org/tests/view/5b8a329f0ebc592cf2749615

Closes https://github.com/official-stockfish/Stockfish/pull/1761

Bench: 4609645
This commit is contained in:
Stéphane Nicolet 2018-09-01 10:39:29 +02:00 • committed by Stéphane Nicolet
parent f923dc0fe5
commit 2bfaf45455
1 changed files with 5 additions and 1 deletions
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6
src/evaluate.cpp
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@ -758,12 +758,16 @@ namespace {
int outflanking = distance<File>(pos.square<KING>(WHITE), pos.square<KING>(BLACK))
- distance<Rank>(pos.square<KING>(WHITE), pos.square<KING>(BLACK));
bool pawnsOnBothFlanks = (pos.pieces(PAWN) & QueenSide)
&& (pos.pieces(PAWN) & KingSide);
// Compute the initiative bonus for the attacking side
int complexity = 8 * pe->pawn_asymmetry()
+ 12 * pos.count<PAWN>()
+ 12 * outflanking
+ 16 * pawnsOnBothFlanks
+ 48 * !pos.non_pawn_material()
-110 ;
-118 ;
// Now apply the bonus: note that we find the attacking side by extracting
// the sign of the endgame value, and that we carefully cap the bonus so