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Scales the endgame score by the number of pawns.

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Credits goes also to Stephane Nicolet for his great idea of scaling by pawns.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 9994 W: 1929 L: 1760 D: 6305

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 11240 W: 1789 L: 1626 D: 7825

bench 7298564

Resolves #423
This commit is contained in:
Stefan Geschwentner 2015-09-15 05:55:09 -07:00 • committed by Joona Kiiski
parent 613dc66c12
commit 660c38f781
1 changed files with 5 additions and 0 deletions
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5
src/evaluate.cpp
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@ -796,6 +796,11 @@ Value Eval::evaluate(const Position& pos) {
sf = ei.pi->pawn_span(strongSide) ? ScaleFactor(56) : ScaleFactor(38); sf = ei.pi->pawn_span(strongSide) ? ScaleFactor(56) : ScaleFactor(38);
} }
// Scale endgame by number of pawns
int p = pos.count<PAWN>(WHITE) + pos.count<PAWN>(BLACK);
int v_eg = 1 + abs(int(eg_value(score)));
sf = ScaleFactor(std::max(sf / 2, sf - 7 * SCALE_FACTOR_NORMAL * (14 - p) / v_eg));
// Interpolate between a middlegame and a (scaled by 'sf') endgame score // Interpolate between a middlegame and a (scaled by 'sf') endgame score
Value v = mg_value(score) * int(me->game_phase()) Value v = mg_value(score) * int(me->game_phase())
+ eg_value(score) * int(PHASE_MIDGAME - me->game_phase()) * sf / SCALE_FACTOR_NORMAL; + eg_value(score) * int(PHASE_MIDGAME - me->game_phase()) * sf / SCALE_FACTOR_NORMAL;