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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;