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Trigger of PawnEndgameExtension if capture is not a pawn

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Instead of a rook.

This gives an unexpected graeat increase!

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-12-17 19:36:51 +01:00
parent b09cbaebb9
commit 17000d1ea0
1 changed files with 7 additions and 3 deletions
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10
src/search.cpp
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@ -2170,6 +2170,8 @@ namespace {
Depth extension(const Position &pos, Move m, bool pvNode, bool check,
bool singleReply, bool mateThreat, bool* dangerous) {
assert(m != MOVE_NONE);
Depth result = Depth(0);
*dangerous = check || singleReply || mateThreat;
@ -2193,10 +2195,12 @@ namespace {
*dangerous = true;
}
if ( pos.midgame_value_of_piece_on(move_to(m)) >= RookValueMidgame
if ( pos.move_is_capture(m)
&& pos.type_of_piece_on(move_to(m)) != PAWN
&& ( pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK)
- pos.midgame_value_of_piece_on(move_to(m)) == Value(0))
&& !move_promotion(m))
&& !move_promotion(m)
&& !move_is_ep(m))
{
result += PawnEndgameExtension[pvNode];
*dangerous = true;
@ -2262,7 +2266,7 @@ namespace {
// value of the threatening piece, don't prune move which defend it.
if ( !PruneDefendingMoves
&& threat != MOVE_NONE
&& pos.type_of_piece_on(tto) != NO_PIECE_TYPE
&& pos.move_is_capture(threat)
&& ( pos.midgame_value_of_piece_on(tfrom) >= pos.midgame_value_of_piece_on(tto)
|| pos.type_of_piece_on(tfrom) == KING)
&& pos.move_attacks_square(m, tto))