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Add mild extension in low depths

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski
2009-11-22 14:58:07 +02:00
committed by Marco Costalba
parent 93c9f342ca
commit 58452de86d
1 changed files with 6 additions and 6 deletions
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12
src/search.cpp
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@@ -1143,7 +1143,7 @@ namespace {
// Only move extension // Only move extension
if ( moveCount == 1 if ( moveCount == 1
&& ext < OnePly && ext < OnePly
&& depth >= 8 * OnePly && depth >= 4 * OnePly
&& tte && tte
&& (tte->type() & VALUE_TYPE_LOWER) && (tte->type() & VALUE_TYPE_LOWER)
&& tte->move() != MOVE_NONE && tte->move() != MOVE_NONE
@@ -1152,9 +1152,9 @@ namespace {
Value ttValue = value_from_tt(tte->value(), ply); Value ttValue = value_from_tt(tte->value(), ply);
if (abs(ttValue) < VALUE_KNOWN_WIN) if (abs(ttValue) < VALUE_KNOWN_WIN)
{ {
Value excValue = search(pos, ss, ttValue - OnlyMoveMargin, depth / 2, ply, false, threadID, tte->move()); Value excValue = search(pos, ss, ttValue - OnlyMoveMargin, Max(Min(depth / 2, depth - 4 * OnePly), OnePly), ply, false, threadID, tte->move());
if (excValue < ttValue - OnlyMoveMargin) if (excValue < ttValue - OnlyMoveMargin)
ext = OnePly; ext = (depth >= 8 * OnePly)? OnePly : ext + OnePly / 2;
} }
} }
@@ -1446,7 +1446,7 @@ namespace {
if ( forbiddenMove == MOVE_NONE if ( forbiddenMove == MOVE_NONE
&& moveCount == 1 && moveCount == 1
&& ext < OnePly && ext < OnePly
&& depth >= 8 * OnePly && depth >= 4 * OnePly
&& tte && tte
&& (tte->type() & VALUE_TYPE_LOWER) && (tte->type() & VALUE_TYPE_LOWER)
&& tte->move() != MOVE_NONE && tte->move() != MOVE_NONE
@@ -1455,9 +1455,9 @@ namespace {
Value ttValue = value_from_tt(tte->value(), ply); Value ttValue = value_from_tt(tte->value(), ply);
if (abs(ttValue) < VALUE_KNOWN_WIN) if (abs(ttValue) < VALUE_KNOWN_WIN)
{ {
Value excValue = search(pos, ss, ttValue - OnlyMoveMargin, depth / 2, ply, false, threadID, tte->move()); Value excValue = search(pos, ss, ttValue - OnlyMoveMargin, Max(Min(depth / 2, depth - 4 * OnePly), OnePly), ply, false, threadID, tte->move());
if (excValue < ttValue - OnlyMoveMargin) if (excValue < ttValue - OnlyMoveMargin)
ext = OnePly; ext = (depth >= 8 * OnePly)? OnePly : ext + OnePly / 2;
} }
} }