timeReduction *= 1.25;
// Use part of the gained time from a previous stable move for the current move
- double unstablePvFactor = 1.0 + mainThread->bestMoveChanges;
- unstablePvFactor *= std::pow(mainThread->previousTimeReduction, 0.528) / timeReduction;
+ double bestMoveInstability = 1.0 + mainThread->bestMoveChanges;
+ bestMoveInstability *= std::pow(mainThread->previousTimeReduction, 0.528) / timeReduction;
// Stop the search if we have only one legal move, or if available time elapsed
if ( rootMoves.size() == 1
- || Time.elapsed() > Time.optimum() * unstablePvFactor * improvingFactor / 581)
+ || Time.elapsed() > Time.optimum() * bestMoveInstability * improvingFactor / 581)
{
// If we are allowed to ponder do not stop the search now but
// keep pondering until the GUI sends "ponderhit" or "stop".
template <NodeType NT>
Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, bool cutNode, bool skipEarlyPruning) {
- const bool PvNode = NT == PV;
+ // Use quiescence search when needed
+ if (depth < ONE_PLY)
+ return qsearch<NT>(pos, ss, alpha, beta);
+
+ constexpr bool PvNode = NT == PV;
const bool rootNode = PvNode && ss->ply == 0;
assert(-VALUE_INFINITE <= alpha && alpha < beta && beta <= VALUE_INFINITE);
else if (eval + RazorMargin2 <= alpha)
{
Value ralpha = alpha - RazorMargin2;
+
Value v = qsearch<NonPV>(pos, ss, ralpha, ralpha+1);
if (v <= ralpha)
ss->contHistory = thisThread->contHistory[NO_PIECE][0].get();
pos.do_null_move(st);
- Value nullValue = depth-R < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -beta, -beta+1)
- : - search<NonPV>(pos, ss+1, -beta, -beta+1, depth-R, !cutNode, true);
+
+ Value nullValue = -search<NonPV>(pos, ss+1, -beta, -beta+1, depth-R, !cutNode, true);
+
pos.undo_null_move();
if (nullValue >= beta)
thisThread->nmp_ply = ss->ply + 3 * (depth-R) / 4;
thisThread->nmp_odd = ss->ply % 2;
- Value v = depth-R < ONE_PLY ? qsearch<NonPV>(pos, ss, beta-1, beta)
- : search<NonPV>(pos, ss, beta-1, beta, depth-R, false, true);
+ Value v = search<NonPV>(pos, ss, beta-1, beta, depth-R, false, true);
thisThread->nmp_odd = thisThread->nmp_ply = 0;
int probCutCount = 0;
while ( (move = mp.next_move()) != MOVE_NONE
- && probCutCount < depth / ONE_PLY - 3)
+ && probCutCount < 3)
if (pos.legal(move))
{
probCutCount++;
// Step 17. Full depth search when LMR is skipped or fails high
if (doFullDepthSearch)
- value = newDepth < ONE_PLY ? -qsearch<NonPV>(pos, ss+1, -(alpha+1), -alpha)
- : - search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, !cutNode, false);
+ value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, newDepth, !cutNode, false);
// For PV nodes only, do a full PV search on the first move or after a fail
// high (in the latter case search only if value < beta), otherwise let the
(ss+1)->pv = pv;
(ss+1)->pv[0] = MOVE_NONE;
- value = newDepth < ONE_PLY ? -qsearch<PV>(pos, ss+1, -beta, -alpha)
- : - search<PV>(pos, ss+1, -beta, -alpha, newDepth, false, false);
+ value = -search<PV>(pos, ss+1, -beta, -alpha, newDepth, false, false);
}
// Step 18. Undo move
template <NodeType NT>
Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth) {
- const bool PvNode = NT == PV;
+ constexpr bool PvNode = NT == PV;
const bool inCheck = bool(pos.checkers());
assert(alpha >= -VALUE_INFINITE && alpha < beta && beta <= VALUE_INFINITE);
return;
// When using nodes, ensure checking rate is not lower than 0.1% of nodes
- callsCnt = Limits.nodes ? std::min(4096, int(Limits.nodes / 1024)) : 4096;
+ callsCnt = Limits.nodes ? std::min(1024, int(Limits.nodes / 1024)) : 1024;
static TimePoint lastInfoTime = now();