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Refine "few moves" in "last minute surprise"

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It seems that "few moves" works because we extend the good
captures at the last ply of PV, so code it directly.

This version seems defenitly stronger then previous one.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2008-10-27 09:28:14 +01:00
parent 74f1efee26
commit 74fd57220e
2 changed files with 3 additions and 7 deletions
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src/search.cpp
+2 -2
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@@ -931,7 +931,7 @@ namespace {
{
assert(move_is_ok(move));
bool fewMoves = (depth <= OnePly && mp.number_of_moves() < 4);
bool lastMinuteSurprise = (depth <= OnePly && mp.current_move_type() == MovePicker::PH_GOOD_CAPTURES);
bool singleReply = (pos.is_check() && mp.number_of_moves() == 1);
bool moveIsCheck = pos.move_is_check(move, dcCandidates);
bool moveIsCapture = pos.move_is_capture(move);
@@ -943,7 +943,7 @@ namespace {
PawnValueMidgame : pos.midgame_value_of_piece_on(move_to(move));
// Decide the new search depth
Depth ext = extension(pos, move, true, moveIsCheck, singleReply || fewMoves, mateThreat);
Depth ext = extension(pos, move, true, moveIsCheck, singleReply || lastMinuteSurprise, mateThreat);
Depth newDepth = depth - OnePly + ext;
// Make and search the move