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LMR dynamic reduction

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Reduce of two plies near the leafs and when we still
have enough depth to go so to limit horizon effects.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-03-20 12:33:30 +01:00
parent 0ff3bf34cd
commit 24b7ad54c7
2 changed files with 7 additions and 4 deletions
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4
src/movepick.cpp
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@@ -141,8 +141,8 @@ Move MovePicker::get_next_move() {
assert(move_is_ok(mateKiller)); assert(move_is_ok(mateKiller));
if (move_is_legal(pos, mateKiller, pinned)) if (move_is_legal(pos, mateKiller, pinned))
return mateKiller; return mateKiller;
} }
break; break;
case PH_GOOD_CAPTURES: case PH_GOOD_CAPTURES:
numOfMoves = generate_captures(pos, moves); numOfMoves = generate_captures(pos, moves);

7
src/search.cpp
View File

@@ -1332,8 +1332,11 @@ namespace {
&& !move_is_castle(move) && !move_is_castle(move)
&& !move_is_killer(move, ss[ply])) && !move_is_killer(move, ss[ply]))
{ {
ss[ply].reduction = OnePly; // LMR dynamic reduction
value = -search(pos, ss, -(beta-1), newDepth-OnePly, ply+1, true, threadID); Depth R = (moveCount >= 3 * LMRNonPVMoves && depth >= 7*OnePly ? 2*OnePly : OnePly);
ss[ply].reduction = R;
value = -search(pos, ss, -(beta-1), newDepth-R, ply+1, true, threadID);
} }
else else
value = beta; // Just to trigger next condition value = beta; // Just to trigger next condition