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Retire pawn span

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Retire pawn span and replace with pawn count in evaluate_scale_factor.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 26482 W: 4929 L: 4818 D: 16735

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 61938 W: 8400 L: 8335 D: 45203

Bench: 7662861
This commit is contained in:
Stefano80 2016-08-15 12:24:48 +02:00 • committed by Marco Costalba
parent 7396c08b79
commit 9585f8ef58
3 changed files with 2 additions and 6 deletions
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4
src/evaluate.cpp
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@ -758,9 +758,9 @@ namespace {
// Endings where weaker side can place his king in front of the opponent's
// pawns are drawish.
else if ( abs(eg) <= BishopValueEg
&& ei.pi->pawn_span(strongSide) <= 1
&& pos.count<PAWN>(strongSide) <= 2
&& !pos.pawn_passed(~strongSide, pos.square<KING>(~strongSide)))
sf = ei.pi->pawn_span(strongSide) ? ScaleFactor(51) : ScaleFactor(37);
sf = ScaleFactor(37 + 7 * pos.count<PAWN>(strongSide));
}
return sf;

2
src/pawns.cpp
View file

@ -173,8 +173,6 @@ namespace {
}
b = e->semiopenFiles[Us] ^ 0xFF;
e->pawnSpan[Us] = b ? int(msb(b) - lsb(b)) : 0;
return score;
}

2
src/pawns.h
View file

@ -37,7 +37,6 @@ struct Entry {
Bitboard pawn_attacks(Color c) const { return pawnAttacks[c]; }
Bitboard passed_pawns(Color c) const { return passedPawns[c]; }
Bitboard pawn_attacks_span(Color c) const { return pawnAttacksSpan[c]; }
int pawn_span(Color c) const { return pawnSpan[c]; }
int pawn_asymmetry() const { return asymmetry; }
int semiopen_file(Color c, File f) const {
@ -73,7 +72,6 @@ struct Entry {
Score kingSafety[COLOR_NB];
int castlingRights[COLOR_NB];
int semiopenFiles[COLOR_NB];
int pawnSpan[COLOR_NB];
int pawnsOnSquares[COLOR_NB][COLOR_NB]; // [color][light/dark squares]
int asymmetry;
};