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Reorder evasions

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Always try ttMove as first. Then try good captures ordered
by MVV/LVA, then non-captures if destination square is not
under attack, ordered by history value, and at the end
bad-captures and non-captures with a negative SEE. This
last group is ordered by the SEE score.

After 999 games at 1+0
Mod vs Orig +254 =546 -199 +19 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2009-10-31 10:51:04 +01:00
parent dddaeff7d8
commit 70b7404a63
1 changed files with 14 additions and 8 deletions
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22
src/movepick.cpp
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@ -197,8 +197,8 @@ void MovePicker::score_captures() {
if (move_is_promotion(m))
cur->score = QueenValueMidgame;
else
cur->score = int(pos.midgame_value_of_piece_on(move_to(m)))
-int(pos.type_of_piece_on(move_from(m)));
cur->score = pos.midgame_value_of_piece_on(move_to(m))
- pos.type_of_piece_on(move_from(m));
}
}
@ -229,19 +229,25 @@ void MovePicker::score_noncaptures() {
}
void MovePicker::score_evasions() {
// Always try ttMove as first. Then try good captures ordered
// by MVV/LVA, then non-captures if destination square is not
// under attack, ordered by history value, and at the end
// bad-captures and non-captures with a negative SEE. This
// last group is ordered by the SEE score.
Move m;
int seeScore;
for (MoveStack* cur = moves; cur != lastMove; cur++)
{
m = cur->move;
if (m == ttMoves[0].move)
cur->score = 2 * HistoryMax;
else if (!pos.square_is_empty(move_to(m)))
{
int seeScore = pos.see(m);
cur->score = seeScore + (seeScore >= 0 ? HistoryMax : 0);
} else
else if ((seeScore = pos.see_sign(m)) < 0)
cur->score = seeScore;
else if (pos.move_is_capture(m))
cur->score = pos.midgame_value_of_piece_on(move_to(m))
- pos.type_of_piece_on(move_from(m)) + HistoryMax;
else
cur->score = H.move_ordering_score(pos.piece_on(move_from(m)), move_to(m));
}
}