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Introduce scale factor in pawn evaluation

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The idea is to reduce the score if we have many
pawns opposing an enemy pawn so that the draw
possibility increases.

Just introduced the logic, but no functional change.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-04-18 10:25:59 +01:00
parent c23cd4d90a
commit 6b7efa0cd1
5 changed files with 33 additions and 6 deletions
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7
src/evaluate.cpp
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@@ -430,6 +430,13 @@ Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID) {
factor[BLACK] = sf;
}
// If we don't already have an unusual scale factor, use pawn
// evaluation ones.
if (factor[WHITE] == SCALE_FACTOR_NORMAL)
factor[WHITE] = ei.pi->scale_factor(WHITE);
if (factor[BLACK] == SCALE_FACTOR_NORMAL)
factor[BLACK] = ei.pi->scale_factor(BLACK);
// Interpolate between the middle game and the endgame score
Color stm = pos.side_to_move();