};
size_t PVIdx;
- TimeManagement Time;
EasyMoveManager EasyMove;
double BestMoveChanges;
Value DrawValue[COLOR_NB];
void Search::think() {
- Time.init(Limits, RootPos.side_to_move(), RootPos.game_ply(), now());
+ Color us = RootPos.side_to_move();
+ Time.init(Limits, us, RootPos.game_ply(), now());
int contempt = Options["Contempt"] * PawnValueEg / 100; // From centipawns
- DrawValue[ RootPos.side_to_move()] = VALUE_DRAW - Value(contempt);
- DrawValue[~RootPos.side_to_move()] = VALUE_DRAW + Value(contempt);
+ DrawValue[ us] = VALUE_DRAW - Value(contempt);
+ DrawValue[~us] = VALUE_DRAW + Value(contempt);
TB::Hits = 0;
TB::RootInTB = false;
Threads.timer->run = false;
}
+ // When playing in 'nodes as time' mode, subtract the searched nodes from
+ // the available ones before to exit.
+ if (Limits.npmsec)
+ Time.availableNodes += Limits.inc[us] - RootPos.nodes_searched();
+
// When we reach the maximum depth, we can arrive here without a raise of
// Signals.stop. However, if we are pondering or in an infinite search,
// the UCI protocol states that we shouldn't print the best move before the
ss->currentMove = ttMove; // Can be MOVE_NONE
// If ttMove is quiet, update killers, history, counter move on TT hit
- if (ttValue >= beta && ttMove && !pos.capture_or_promotion(ttMove) && !inCheck)
+ if (ttValue >= beta && ttMove && !pos.capture_or_promotion(ttMove))
update_stats(pos, ss, ttMove, depth, nullptr, 0);
return ttValue;
}
ss->currentMove = move;
- if (!SpNode && !captureOrPromotion && quietCount < 64)
- quietsSearched[quietCount++] = move;
// Step 14. Make the move
pos.do_move(move, st, givesCheck);
rm.score = -VALUE_INFINITE;
}
+ bool newBestMove = false;
if (value > bestValue)
{
bestValue = SpNode ? splitPoint->bestValue = value : value;
&& (move != EasyMove.get(pos.key()) || moveCount > 1))
EasyMove.clear();
+ newBestMove = true;
bestMove = SpNode ? splitPoint->bestMove = move : move;
if (PvNode && !RootNode) // Update pv even in fail-high case
}
}
+ if (!SpNode && !captureOrPromotion && !newBestMove && quietCount < 64)
+ quietsSearched[quietCount++] = move;
+
// Step 19. Check for splitting the search
if ( !SpNode
&& Threads.size() >= 2
: inCheck ? mated_in(ss->ply) : DrawValue[pos.side_to_move()];
// Quiet best move: update killers, history and countermoves
- else if (bestValue >= beta && !pos.capture_or_promotion(bestMove) && !inCheck)
- update_stats(pos, ss, bestMove, depth, quietsSearched, quietCount - 1);
+ else if (bestMove != MOVE_NONE && !pos.capture_or_promotion(bestMove))
+ update_stats(pos, ss, bestMove, depth, quietsSearched, quietCount);
tte->save(posKey, value_to_tt(bestValue, ss->ply),
bestValue >= beta ? BOUND_LOWER :
// Detect non-capture evasions that are candidates to be pruned
evasionPrunable = InCheck
&& bestValue > VALUE_MATED_IN_MAX_PLY
- && !pos.capture(move)
- && !pos.can_castle(pos.side_to_move());
+ && !pos.capture(move);
// Don't search moves with negative SEE values
if ( (!InCheck || evasionPrunable)
*pv = MOVE_NONE;
}
- // update_stats() updates killers, history and countermoves stats after a fail-high
- // of a quiet move.
+ // update_stats() updates killers, history, countermove history and countermoves stats for a quiet best move.
void update_stats(const Position& pos, Stack* ss, Move move, Depth depth, Move* quiets, int quietsCnt) {