LimitsType Limits;
RootMoveVector RootMoves;
Position RootPos;
- TimePoint SearchTime;
StateStackPtr SetupStates;
}
HistoryStats History;
CounterMovesHistoryStats CounterMovesHistory;
GainsStats Gains;
- MovesStats Countermoves, Followupmoves;
+ MovesStats Countermoves;
template <NodeType NT, bool SpNode>
Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, bool cutNode);
void Search::think() {
- TimeMgr.init(Limits, RootPos.side_to_move(), RootPos.game_ply());
+ TimeMgr.init(Limits, RootPos.side_to_move(), RootPos.game_ply(), now());
int contempt = Options["Contempt"] * PawnValueEg / 100; // From centipawns
DrawValue[ RootPos.side_to_move()] = VALUE_DRAW - Value(contempt);
CounterMovesHistory.clear();
Gains.clear();
Countermoves.clear();
- Followupmoves.clear();
size_t multiPV = Options["MultiPV"];
Skill skill(Options["Skill Level"]);
// the UI) before a re-search.
if ( multiPV == 1
&& (bestValue <= alpha || bestValue >= beta)
- && now() - SearchTime > 3000)
+ && TimeMgr.elapsed_time() > 3000)
sync_cout << UCI::pv(pos, depth, alpha, beta) << sync_endl;
// In case of failing low/high increase aspiration window and
if (Signals.stop)
sync_cout << "info nodes " << RootPos.nodes_searched()
- << " time " << now() - SearchTime << sync_endl;
+ << " time " << TimeMgr.elapsed_time() << sync_endl;
- else if (PVIdx + 1 == multiPV || now() - SearchTime > 3000)
+ else if (PVIdx + 1 == multiPV || TimeMgr.elapsed_time() > 3000)
sync_cout << UCI::pv(pos, depth, alpha, beta) << sync_endl;
}
// of the available time has been used or we matched an easyMove
// from the previous search and just did a fast verification.
if ( RootMoves.size() == 1
- || now() - SearchTime > TimeMgr.available_time()
+ || TimeMgr.elapsed_time() > TimeMgr.available_time()
|| ( RootMoves[0].pv[0] == easyMove
&& BestMoveChanges < 0.03
- && now() - SearchTime > TimeMgr.available_time() / 10))
+ && TimeMgr.elapsed_time() > TimeMgr.available_time() / 10))
{
// If we are allowed to ponder do not stop the search now but
// keep pondering until the GUI sends "ponderhit" or "stop".
// Clear any candidate easy move that wasn't stable for the last search
// iterations; the second condition prevents consecutive fast moves.
- if (EasyMove.stableCnt < 6 || now() - SearchTime < TimeMgr.available_time())
+ if (EasyMove.stableCnt < 6 || TimeMgr.elapsed_time() < TimeMgr.available_time())
EasyMove.clear();
// If skill level is enabled, swap best PV line with the sub-optimal one
{
ss->currentMove = ttMove; // Can be MOVE_NONE
- // If ttMove is quiet, update killers, history, counter move and followup move on TT hit
+ // If ttMove is quiet, update killers, history, counter move on TT hit
if (ttValue >= beta && ttMove && !pos.capture_or_promotion(ttMove) && !inCheck)
update_stats(pos, ss, ttMove, depth, nullptr, 0);
moves_loop: // When in check and at SpNode search starts from here
Square prevMoveSq = to_sq((ss-1)->currentMove);
- Move countermoves[] = { Countermoves[pos.piece_on(prevMoveSq)][prevMoveSq].first,
- Countermoves[pos.piece_on(prevMoveSq)][prevMoveSq].second };
+ Move countermove = Countermoves[pos.piece_on(prevMoveSq)][prevMoveSq];
- Square prevOwnMoveSq = to_sq((ss-2)->currentMove);
- Move followupmoves[] = { Followupmoves[pos.piece_on(prevOwnMoveSq)][prevOwnMoveSq].first,
- Followupmoves[pos.piece_on(prevOwnMoveSq)][prevOwnMoveSq].second };
-
- MovePicker mp(pos, ttMove, depth, History, CounterMovesHistory, countermoves, followupmoves, ss);
+ MovePicker mp(pos, ttMove, depth, History, CounterMovesHistory, countermove, ss);
CheckInfo ci(pos);
value = bestValue; // Workaround a bogus 'uninitialized' warning under gcc
improving = ss->staticEval >= (ss-2)->staticEval
{
Signals.firstRootMove = (moveCount == 1);
- if (thisThread == Threads.main() && now() - SearchTime > 3000)
+ if (thisThread == Threads.main() && TimeMgr.elapsed_time() > 3000)
sync_cout << "info depth " << depth / ONE_PLY
<< " currmove " << UCI::move(move, pos.is_chess960())
<< " currmovenumber " << moveCount + PVIdx << sync_endl;
ss->reduction = reduction<PvNode>(improving, depth, moveCount);
if ( (!PvNode && cutNode)
- || History[pos.piece_on(to_sq(move))][to_sq(move)] < VALUE_ZERO)
+ || History[pos.piece_on(to_sq(move))][to_sq(move)] < VALUE_ZERO
+ || ( History[pos.piece_on(to_sq(move))][to_sq(move)]
+ + CounterMovesHistory[pos.piece_on(prevMoveSq)][prevMoveSq]
+ [pos.piece_on(to_sq(move))][to_sq(move)] < VALUE_ZERO))
ss->reduction += ONE_PLY;
- if (move == countermoves[0] || move == countermoves[1])
+ if (move == countermove)
ss->reduction = std::max(DEPTH_ZERO, ss->reduction - ONE_PLY);
// Decrease reduction for moves that escape a capture
bestValue = excludedMove ? alpha
: inCheck ? mated_in(ss->ply) : DrawValue[pos.side_to_move()];
- // Quiet best move: update killers, history, countermoves and followupmoves
+ // 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);
*pv = MOVE_NONE;
}
- // update_stats() updates killers, history, countermoves and followupmoves
- // stats after a fail-high of a quiet move.
+ // update_stats() updates killers, history and countermoves stats after a fail-high
+ // of a quiet move.
void update_stats(const Position& pos, Stack* ss, Move move, Depth depth, Move* quiets, int quietsCnt) {
cmh.update(pos.moved_piece(quiets[i]), to_sq(quiets[i]), -bonus);
}
+ // Extra penalty for TT move in previous ply when it gets refuted
if (is_ok((ss-2)->currentMove) && (ss-1)->currentMove == (ss-1)->ttMove)
{
Square prevPrevSq = to_sq((ss-2)->currentMove);
- Followupmoves.update(pos.piece_on(prevPrevSq), prevPrevSq, move);
+ HistoryStats& ttMoveCmh = CounterMovesHistory[pos.piece_on(prevPrevSq)][prevPrevSq];
+ ttMoveCmh.update(pos.piece_on(prevSq), prevSq, -bonus - 2 * depth / ONE_PLY - 1);
}
}
string UCI::pv(const Position& pos, Depth depth, Value alpha, Value beta) {
std::stringstream ss;
- TimePoint elapsed = now() - SearchTime + 1;
+ TimePoint elapsed = TimeMgr.elapsed_time() + 1;
size_t multiPV = std::min((size_t)Options["MultiPV"], RootMoves.size());
int selDepth = 0;
void check_time() {
static TimePoint lastInfoTime = now();
- TimePoint elapsed = now() - SearchTime;
+ TimePoint elapsed = TimeMgr.elapsed_time();
if (now() - lastInfoTime >= 1000)
{
projects / stockfish / blobdiff