Value id_loop(const Position& pos, Move searchMoves[]);
Value root_search(Position& pos, SearchStack* ss, Move* pv, RootMoveList& rml, Value* alphaPtr, Value* betaPtr);
- template <NodeType PvNode>
+ template <NodeType PvNode, bool SplitPoint>
Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply);
+ template <NodeType PvNode>
+ inline Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply) {
+ return search<PvNode, false>(pos, ss, alpha, beta, depth, ply);
+ }
+
+ template <NodeType PvNode>
+ void sp_search(Position& pos, SearchStack* ss, Value dumy, Value beta, Depth depth, int ply);
+
template <NodeType PvNode>
Value qsearch(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply);
template <NodeType PvNode>
- void sp_search(SplitPoint* sp, int threadID);
+ void do_sp_search(SplitPoint* sp, int threadID);
template <NodeType PvNode>
Depth extension(const Position& pos, Move m, bool captureOrPromotion, bool moveIsCheck, bool singleEvasion, bool mateThreat, bool* dangerous);
// search<>() is the main search function for both PV and non-PV nodes
- template <NodeType PvNode>
+ template <NodeType PvNode, bool SplitPoint>
Value search(Position& pos, SearchStack* ss, Value alpha, Value beta, Depth depth, int ply) {
assert(alpha >= -VALUE_INFINITE && alpha <= VALUE_INFINITE);
int threadID = pos.thread();
refinedValue = bestValue = value = -VALUE_INFINITE;
oldAlpha = alpha;
+ isCheck = pos.is_check();
+
+ if (SplitPoint)
+ {
+ tte = NULL;
+ ttMove = excludedMove = MOVE_NONE;
+ threatMove = ss->sp->threatMove;
+ mateThreat = ss->sp->mateThreat;
+ goto split_start;
+ }
// Step 1. Initialize node and poll. Polling can abort search
ThreadsMgr.incrementNodeCounter(threadID);
// Step 5. Evaluate the position statically and
// update gain statistics of parent move.
- isCheck = pos.is_check();
if (isCheck)
ss->eval = evalMargin = VALUE_NONE;
else if (tte)
if (PvNode)
mateThreat = pos.has_mate_threat();
+split_start:
+
// Initialize a MovePicker object for the current position
- MovePicker mp = MovePicker(pos, ttMove, depth, H, ss, (PvNode ? -VALUE_INFINITE : beta));
+ MovePicker mpBase = MovePicker(pos, ttMove, depth, H, ss, (PvNode ? -VALUE_INFINITE : beta));
+ MovePicker& mp = SplitPoint ? *ss->sp->mp : mpBase;
CheckInfo ci(pos);
ss->bestMove = MOVE_NONE;
- singleEvasion = isCheck && mp.number_of_evasions() == 1;
- futilityBase = ss->eval + evalMargin;
- singularExtensionNode = depth >= SingularExtensionDepth[PvNode]
+ singleEvasion = SplitPoint ? false : isCheck && mp.number_of_evasions() == 1;
+ futilityBase = SplitPoint ? ss->eval : ss->eval + evalMargin;
+ singularExtensionNode = !SplitPoint
+ && depth >= SingularExtensionDepth[PvNode]
&& tte
&& tte->move()
&& !excludedMove // Do not allow recursive singular extension search
// Step 10. Loop through moves
// Loop through all legal moves until no moves remain or a beta cutoff occurs
+ if (SplitPoint)
+ {
+ lock_grab(&(ss->sp->lock));
+ bestValue = ss->sp->bestValue;
+ }
+
while ( bestValue < beta
&& (move = mp.get_next_move()) != MOVE_NONE
&& !ThreadsMgr.thread_should_stop(threadID))
{
+ if (SplitPoint)
+ {
+ moveCount = ++ss->sp->moveCount;
+ lock_release(&(ss->sp->lock));
+ }
+
assert(move_is_ok(move));
if (move == excludedMove)
// Move count based pruning
if ( moveCount >= futility_move_count(depth)
&& !(threatMove && connected_threat(pos, move, threatMove))
- && bestValue > value_mated_in(PLY_MAX))
+ && bestValue > value_mated_in(PLY_MAX)) // FIXME bestValue is racy
+ {
+ if (SplitPoint)
+ lock_grab(&(ss->sp->lock));
continue;
+ }
// Value based pruning
// We illogically ignore reduction condition depth >= 3*ONE_PLY for predicted depth,
if (futilityValueScaled < beta)
{
- if (futilityValueScaled > bestValue)
+ if (SplitPoint)
+ {
+ lock_grab(&(ss->sp->lock));
+ if (futilityValueScaled > ss->sp->bestValue)
+ ss->sp->bestValue = futilityValueScaled;
+ }
+ else if (futilityValueScaled > bestValue)
bestValue = futilityValueScaled;
continue;
}
// Step extra. pv search (only in PV nodes)
// The first move in list is the expected PV
- if (PvNode && moveCount == 1)
+ if (!SplitPoint && PvNode && moveCount == 1)
value = newDepth < ONE_PLY ? -qsearch<PV>(pos, ss+1, -beta, -alpha, DEPTH_ZERO, ply+1)
: - search<PV>(pos, ss+1, -beta, -alpha, newDepth, ply+1);
else
ss->reduction = reduction<PvNode>(depth, moveCount);
if (ss->reduction)
{
+ alpha = SplitPoint ? ss->sp->alpha : alpha;
Depth d = newDepth - ss->reduction;
value = d < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, DEPTH_ZERO, ply+1)
: - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, ply+1);
assert(newDepth - ONE_PLY >= ONE_PLY);
ss->reduction = ONE_PLY;
+ alpha = SplitPoint ? ss->sp->alpha : alpha;
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth-ss->reduction, ply+1);
doFullDepthSearch = (value > alpha);
}
// Step 15. Full depth search
if (doFullDepthSearch)
{
+ alpha = SplitPoint ? ss->sp->alpha : alpha;
value = newDepth < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha, DEPTH_ZERO, ply+1)
: - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, ply+1);
assert(value > -VALUE_INFINITE && value < VALUE_INFINITE);
// Step 17. Check for new best move
- if (value > bestValue)
+ if (SplitPoint)
+ {
+ lock_grab(&(ss->sp->lock));
+ bestValue = ss->sp->bestValue;
+ alpha = ss->sp->alpha;
+ }
+
+ if (value > bestValue && !(SplitPoint && ThreadsMgr.thread_should_stop(threadID)))
{
bestValue = value;
if (value > alpha)
{
+ if (SplitPoint && (!PvNode || value >= beta))
+ ss->sp->stopRequest = true;
+
if (PvNode && value < beta) // We want always alpha < beta
alpha = value;
ss->bestMove = move;
}
+ if (SplitPoint)
+ {
+ ss->sp->bestValue = bestValue;
+ ss->sp->alpha = alpha;
+ ss->sp->parentSstack->bestMove = ss->bestMove;
+ }
}
// Step 18. Check for split
- if ( depth >= MinimumSplitDepth
+ if ( !SplitPoint
+ && depth >= MinimumSplitDepth
&& ThreadsMgr.active_threads() > 1
&& bestValue < beta
&& ThreadsMgr.available_thread_exists(threadID)
threatMove, mateThreat, moveCount, &mp, PvNode);
}
+ if (SplitPoint)
+ {
+ /* Here we have the lock still grabbed */
+ ss->sp->slaves[threadID] = 0;
+ lock_release(&(ss->sp->lock));
+ return bestValue;
+ }
+
// Step 19. Check for mate and stalemate
// All legal moves have been searched and if there are
// no legal moves, it must be mate or stalemate.
// care of after we return from the split point.
template <NodeType PvNode>
- void sp_search(SplitPoint* sp, int threadID) {
+ void do_sp_search(SplitPoint* sp, int threadID) {
assert(threadID >= 0 && threadID < ThreadsMgr.active_threads());
assert(ThreadsMgr.active_threads() > 1);
+ Position pos(*sp->pos, threadID);
+ SearchStack* ss = sp->sstack[threadID] + 1;
+ ss->sp = sp;
+
+ search<PvNode, true>(pos, ss, sp->alpha, sp->beta, sp->depth, sp->ply);
+ }
+
+ template <NodeType PvNode>
+ void sp_search(Position& pos, SearchStack* ss, Value, Value beta, Depth depth, int ply) {
+
StateInfo st;
Move move;
Depth ext, newDepth;
bool isCheck, moveIsCheck, captureOrPromotion, dangerous;
int moveCount;
value = -VALUE_INFINITE;
+ SplitPoint* sp = ss->sp;
+ Move threatMove = sp->threatMove;
+ MovePicker& mp = *sp->mp;
+ int threadID = pos.thread();
- Position pos(*sp->pos, threadID);
CheckInfo ci(pos);
- SearchStack* ss = sp->sstack[threadID] + 1;
isCheck = pos.is_check();
// Step 10. Loop through moves
// Loop through all legal moves until no moves remain or a beta cutoff occurs
lock_grab(&(sp->lock));
- while ( sp->bestValue < sp->beta
- && (move = sp->mp->get_next_move()) != MOVE_NONE
+ while ( sp->bestValue < beta
+ && (move = mp.get_next_move()) != MOVE_NONE
&& !ThreadsMgr.thread_should_stop(threadID))
{
moveCount = ++sp->moveCount;
// Step 11. Decide the new search depth
ext = extension<PvNode>(pos, move, captureOrPromotion, moveIsCheck, false, sp->mateThreat, &dangerous);
- newDepth = sp->depth - ONE_PLY + ext;
+ newDepth = depth - ONE_PLY + ext;
// Update current move
ss->currentMove = move;
&& !move_is_castle(move))
{
// Move count based pruning
- if ( moveCount >= futility_move_count(sp->depth)
- && !(sp->threatMove && connected_threat(pos, move, sp->threatMove))
+ if ( moveCount >= futility_move_count(depth)
+ && !(threatMove && connected_threat(pos, move, threatMove))
&& sp->bestValue > value_mated_in(PLY_MAX))
{
lock_grab(&(sp->lock));
}
// Value based pruning
- Depth predictedDepth = newDepth - reduction<NonPV>(sp->depth, moveCount);
+ Depth predictedDepth = newDepth - reduction<NonPV>(depth, moveCount);
futilityValueScaled = ss->eval + futility_margin(predictedDepth, moveCount)
+ H.gain(pos.piece_on(move_from(move)), move_to(move));
- if (futilityValueScaled < sp->beta)
+ if (futilityValueScaled < beta)
{
lock_grab(&(sp->lock));
&& !move_is_castle(move)
&& !move_is_killer(move, ss))
{
- ss->reduction = reduction<PvNode>(sp->depth, moveCount);
+ ss->reduction = reduction<PvNode>(depth, moveCount);
if (ss->reduction)
{
Value localAlpha = sp->alpha;
Depth d = newDepth - ss->reduction;
- value = d < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, DEPTH_ZERO, sp->ply+1)
- : - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, d, sp->ply+1);
+ value = d < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, DEPTH_ZERO, ply+1)
+ : - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, d, ply+1);
doFullDepthSearch = (value > localAlpha);
}
ss->reduction = ONE_PLY;
Value localAlpha = sp->alpha;
- value = -search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth-ss->reduction, sp->ply+1);
+ value = -search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth-ss->reduction, ply+1);
doFullDepthSearch = (value > localAlpha);
}
ss->reduction = DEPTH_ZERO; // Restore original reduction
if (doFullDepthSearch)
{
Value localAlpha = sp->alpha;
- value = newDepth < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, DEPTH_ZERO, sp->ply+1)
- : - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth, sp->ply+1);
+ value = newDepth < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, DEPTH_ZERO, ply+1)
+ : - search<NonPV>(pos, ss+1, -(localAlpha+1), -localAlpha, newDepth, ply+1);
// Step extra. pv search (only in PV nodes)
// Search only for possible new PV nodes, if instead value >= beta then
// parent node fails low with value <= alpha and tries another move.
- if (PvNode && value > localAlpha && value < sp->beta)
- value = newDepth < ONE_PLY ? -qsearch<PV>(pos, ss+1, -sp->beta, -sp->alpha, DEPTH_ZERO, sp->ply+1)
- : - search<PV>(pos, ss+1, -sp->beta, -sp->alpha, newDepth, sp->ply+1);
+ if (PvNode && value > localAlpha && value < beta)
+ value = newDepth < ONE_PLY ? -qsearch<PV>(pos, ss+1, -beta, -sp->alpha, DEPTH_ZERO, ply+1)
+ : - search<PV>(pos, ss+1, -beta, -sp->alpha, newDepth, ply+1);
}
// Step 16. Undo move
sp->bestValue = value;
if (value > sp->alpha)
{
- if (!PvNode || value >= sp->beta)
+ if (!PvNode || value >= beta)
sp->stopRequest = true;
- if (PvNode && value < sp->beta) // We want always sp->alpha < sp->beta
+ if (PvNode && value < beta) // We want always sp->alpha < beta
sp->alpha = value;
sp->parentSstack->bestMove = ss->bestMove = move;
ss->excludedMove = MOVE_NONE;
ss->skipNullMove = false;
ss->reduction = DEPTH_ZERO;
+ ss->sp = NULL;
if (i < 3)
ss->killers[0] = ss->killers[1] = ss->mateKiller = MOVE_NONE;
threads[threadID].state = THREAD_SEARCHING;
if (threads[threadID].splitPoint->pvNode)
- sp_search<PV>(threads[threadID].splitPoint, threadID);
+ do_sp_search<PV>(threads[threadID].splitPoint, threadID);
else
- sp_search<NonPV>(threads[threadID].splitPoint, threadID);
+ do_sp_search<NonPV>(threads[threadID].splitPoint, threadID);
assert(threads[threadID].state == THREAD_SEARCHING);