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Revert last Only move extensions tweaks

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They gave bad results:

Mod - Orig: 361 - 404

Master is now verified to be functional equivalent with F_63

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2009-11-25 15:15:47 +02:00 • committed by Marco Costalba
parent 55b5b03273
commit 5ea8167921
1 changed files with 5 additions and 7 deletions
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12
src/search.cpp
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@ -1158,7 +1158,7 @@ namespace {
// To verify this we do a reduced search on all the other moves but the ttMove,
// if result is lower then TT value minus a margin then we assume ttMove is the
// only one playable. It is a kind of relaxed single reply extension.
if ( depth >= 4 * OnePly
if ( depth >= 8 * OnePly
&& move == ttMove
&& ext < OnePly
&& is_lower_bound(tte->type())
@ -1168,8 +1168,7 @@ namespace {
if (abs(ttValue) < VALUE_KNOWN_WIN)
{
Depth d = Max(Min(depth / 2, depth - 4 * OnePly), OnePly);
Value excValue = search(pos, ss, ttValue - SingleReplyMargin, d, ply, false, threadID, ttMove);
Value excValue = search(pos, ss, ttValue - SingleReplyMargin, depth / 2, ply, false, threadID, ttMove);
// If search result is well below the foreseen score of the ttMove then we
// assume ttMove is the only one realistically playable and we extend it.
@ -1461,7 +1460,7 @@ namespace {
// To verify this we do a reduced search on all the other moves but the ttMove,
// if result is lower then TT value minus a margin then we assume ttMove is the
// only one playable. It is a kind of relaxed single reply extension.
if ( depth >= 4 * OnePly
if ( depth >= 8 * OnePly
&& !excludedMove // do not allow recursive single-reply search
&& move == ttMove
&& ext < OnePly
@ -1472,13 +1471,12 @@ namespace {
if (abs(ttValue) < VALUE_KNOWN_WIN)
{
Depth d = Max(Min(depth / 2, depth - 4 * OnePly), OnePly);
Value excValue = search(pos, ss, ttValue - SingleReplyMargin, d, ply, false, threadID, ttMove);
Value excValue = search(pos, ss, ttValue - SingleReplyMargin, depth / 2, ply, false, threadID, ttMove);
// If search result is well below the foreseen score of the ttMove then we
// assume ttMove is the only one realistically playable and we extend it.
if (excValue < ttValue - SingleReplyMargin)
ext = (depth >= 8 * OnePly) ? OnePly : ext + OnePly / 2;
ext = OnePly;
}
}