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Score non-captures only by history

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Now that history can go negative and is almost alwyas
non zero we have no more reasons to use also psqt term.

After 994 games at 1+0
Mod vs Orig +204 =597 -193 +4 ELO

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2010-02-03 19:36:53 +01:00
parent 5b1043ee11
commit 337ec0f3d0
1 changed files with 1 additions and 9 deletions
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10
src/movepick.cpp
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@ -213,7 +213,6 @@ void MovePicker::score_noncaptures() {
Move m; Move m;
Piece piece; Piece piece;
Square from, to; Square from, to;
int hs;
for (MoveStack* cur = moves; cur != lastMove; cur++) for (MoveStack* cur = moves; cur != lastMove; cur++)
{ {
@ -221,14 +220,7 @@ void MovePicker::score_noncaptures() {
from = move_from(m); from = move_from(m);
to = move_to(m); to = move_to(m);
piece = pos.piece_on(from); piece = pos.piece_on(from);
hs = H.move_ordering_score(piece, to); cur->score = H.move_ordering_score(piece, to);
// Ensure history is always preferred to pst
if (hs > 0)
hs += 1000;
// pst based scoring
cur->score = hs + mg_value(pos.pst_delta(piece, from, to));
} }
} }