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Use gain table to order non-captures

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Gain value is multiplied by 16 to be of comparable magnitudo
of negative history, on average.

This patch shows very good results in tactical tests, but
started very bad in real games, so I have run two test matches.

After 896 games at 1+0
Mod vs Orig +187 =525 -184 +1 ELO

After 999 games at 1+0
Mod vs Orig +223 =590 -186 +13 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2010-02-04 19:24:41 +01:00
parent 9429d2d028
commit 2e70a2873f
1 changed files with 9 additions and 1 deletions
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10
src/movepick.cpp
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@@ -213,6 +213,7 @@ void MovePicker::score_noncaptures() {
Move m;
Piece piece;
Square from, to;
int hs;
for (MoveStack* cur = moves; cur != lastMove; cur++)
{
@@ -220,7 +221,14 @@ void MovePicker::score_noncaptures() {
from = move_from(m);
to = move_to(m);
piece = pos.piece_on(from);
cur->score = H.move_ordering_score(piece, to);
hs = H.move_ordering_score(piece, to);
// Ensure history has always highest priority
if (hs > 0)
hs += 10000;
// Gain table based scoring
cur->score = hs + 16 * H.gain(piece, to);
}
}