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Collect MaxGain statistics

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Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Joona Kiiski 2010-01-21 17:58:00 +02:00 • committed by Marco Costalba
parent cfe59de27d
commit 22b8dc8c98
1 changed files with 46 additions and 1 deletions
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47
src/search.cpp
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@ -894,6 +894,14 @@ namespace {
Value oldAlpha = alpha; Value oldAlpha = alpha;
Value value = -VALUE_INFINITE; Value value = -VALUE_INFINITE;
CheckInfo ci(pos); CheckInfo ci(pos);
bool isCheck = pos.is_check();
// Evaluate the position statically
EvalInfo ei;
if (!isCheck)
ss[0].eval = evaluate(pos, ei, 0);
else
ss[0].eval = VALUE_NONE;
// Loop through all the moves in the root move list // Loop through all the moves in the root move list
for (int i = 0; i < rml.move_count() && !AbortSearch; i++) for (int i = 0; i < rml.move_count() && !AbortSearch; i++)
@ -1156,9 +1164,25 @@ namespace {
tte = TT.retrieve(pos.get_key()); tte = TT.retrieve(pos.get_key());
} }
// Evaluate the position statically
isCheck = pos.is_check();
EvalInfo ei;
if (!isCheck)
{
ss[ply].eval = evaluate(pos, ei, threadID);
// Store gain statistics
Move m = ss[ply - 1].currentMove;
if ( m != MOVE_NULL
&& pos.captured_piece() == NO_PIECE_TYPE
&& !move_is_castle(m)
&& !move_is_promotion(m))
MG.store(pos.piece_on(move_to(m)), move_from(m), move_to(m), ss[ply - 1].eval, -ss[ply].eval);
}
// Initialize a MovePicker object for the current position, and prepare // Initialize a MovePicker object for the current position, and prepare
// to search all moves // to search all moves
isCheck = pos.is_check();
mateThreat = pos.has_mate_threat(opposite_color(pos.side_to_move())); mateThreat = pos.has_mate_threat(opposite_color(pos.side_to_move()));
CheckInfo ci(pos); CheckInfo ci(pos);
MovePicker mp = MovePicker(pos, ttMove, depth, H, &ss[ply]); MovePicker mp = MovePicker(pos, ttMove, depth, H, &ss[ply]);
@ -1394,6 +1418,14 @@ namespace {
ss[ply].eval = staticValue; ss[ply].eval = staticValue;
futilityValue = staticValue + FutilityValueMargin; futilityValue = staticValue + FutilityValueMargin;
staticValue = refine_eval(tte, staticValue, ply); // Enhance accuracy with TT value if possible staticValue = refine_eval(tte, staticValue, ply); // Enhance accuracy with TT value if possible
// Store gain statistics
Move m = ss[ply - 1].currentMove;
if ( m != MOVE_NULL
&& pos.captured_piece() == NO_PIECE_TYPE
&& !move_is_castle(m)
&& !move_is_promotion(m))
MG.store(pos.piece_on(move_to(m)), move_from(m), move_to(m), ss[ply - 1].eval, -ss[ply].eval);
} }
// Null move search // Null move search
@ -1685,6 +1717,19 @@ namespace {
else else
staticValue = evaluate(pos, ei, threadID); staticValue = evaluate(pos, ei, threadID);
if (!isCheck)
{
ss[ply].eval = staticValue;
// Store gain statistics
Move m = ss[ply - 1].currentMove;
if ( m != MOVE_NULL
&& pos.captured_piece() == NO_PIECE_TYPE
&& !move_is_castle(m)
&& !move_is_promotion(m))
MG.store(pos.piece_on(move_to(m)), move_from(m), move_to(m), ss[ply - 1].eval, -ss[ply].eval);
}
// Initialize "stand pat score", and return it immediately if it is // Initialize "stand pat score", and return it immediately if it is
// at least beta. // at least beta.
bestValue = staticValue; bestValue = staticValue;