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Revert dynamic LMR

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It doesn't seem to work against Toga. After more then 400 games
we are at -13 ELO while, without it we are at + 5 ELO after 1000
games.

So revert for now to keep code simple.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba
2009-04-03 20:34:22 +01:00
parent 7b05b83bf2
commit 8590a6f3b7
1 changed files with 2 additions and 10 deletions
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12
src/search.cpp
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@@ -121,9 +121,6 @@ namespace {
// Depth limit for selective search:
Depth SelectiveDepth = 7*OnePly;
// Use dynamic LMR?
const bool UseDynamicLMR = false;
// Use internal iterative deepening?
const bool UseIIDAtPVNodes = true;
const bool UseIIDAtNonPVNodes = false;
@@ -1335,13 +1332,8 @@ namespace {
&& !move_is_castle(move)
&& !move_is_killer(move, ss[ply]))
{
// LMR dynamic reduction
Depth R = UseDynamicLMR
&& moveCount >= 2 * LMRNonPVMoves
&& depth > 7*OnePly ? 2*OnePly : OnePly;
ss[ply].reduction = R;
value = -search(pos, ss, -(beta-1), newDepth-R, ply+1, true, threadID);
ss[ply].reduction = OnePly;
value = -search(pos, ss, -(beta-1), newDepth-OnePly, ply+1, true, threadID);
}
else
value = beta; // Just to trigger next condition