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Reintroduce piece/square tables to score non-captures

Browse source 
Was removed after original movepick restore. But proved
to be useful.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-10-26 13:44:34 +01:00
parent a5c1b3e8f6
commit 88885399f4
1 changed files with 22 additions and 10 deletions
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32
src/movepick.cpp
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@ -226,16 +226,28 @@ void MovePicker::score_captures() {
}
void MovePicker::score_noncaptures() {
for (int i = 0; i < numOfMoves; i++)
{
Move m = moves[i].move;
if (m == killer1)
moves[i].score = HistoryMax + 2;
else if (m == killer2)
moves[i].score = HistoryMax + 1;
else
moves[i].score = H.move_ordering_score(pos.piece_on(move_from(m)), m);
// First score by history, when no history is available then use
// piece/square tables values. This seems to be better then a
// random choice when we don't have an history for any move.
Move m;
int hs;
for (int i = 0; i < numOfMoves; i++)
{
m = moves[i].move;
if (m == killer1)
hs = HistoryMax + 2;
else if (m == killer2)
hs = HistoryMax + 1;
else
hs = H.move_ordering_score(pos.piece_on(move_from(m)), m);
// Ensure moves in history are always sorted as first
if (hs > 0)
hs += 1000;
moves[i].score = hs + pos.mg_pst_delta(m);
}
}