-# List of authors for Stockfish, as of January 7, 2020
+# List of authors for Stockfish, as of March 30, 2020
Tord Romstad (romstad)
Marco Costalba (mcostalba)
Patrick Jansen (mibere)
pellanda
Peter Zsifkovits (CoffeeOne)
+Praveen Kumar Tummala (praveentml)
Rahul Dsilva (silversolver1)
Ralph Stößer (Ralph Stoesser)
Raminder Singh
value = bestValue;
singularLMR = moveCountPruning = false;
ttCapture = ttMove && pos.capture_or_promotion(ttMove);
+ bool formerPv = ttPv && !PvNode;
// Mark this node as being searched
ThreadHolding th(thisThread, posKey, ss->ply);
&& tte->depth() >= depth - 3
&& pos.legal(move))
{
- Value singularBeta = ttValue - (((ttPv && !PvNode) + 4) * depth) / 2;
- Depth singularDepth = (depth - 1 + 3 * (ttPv && !PvNode)) / 2;
+ Value singularBeta = ttValue - ((formerPv + 4) * depth) / 2;
+ Depth singularDepth = (depth - 1 + 3 * formerPv) / 2;
ss->excludedMove = move;
value = search<NonPV>(pos, ss, singularBeta - 1, singularBeta, singularDepth, cutNode);
ss->excludedMove = MOVE_NONE;
if (ttPv)
r -= 2;
+ if (moveCountPruning && !formerPv)
+ r++;
+
// Decrease reduction if opponent's move count is high (~5 Elo)
if ((ss-1)->moveCount > 14)
r--;
// Decrease reduction if ttMove has been singularly extended (~3 Elo)
if (singularLMR)
- r -= 1 + (ttPv && !PvNode);
+ r -= 1 + formerPv;
if (!captureOrPromotion)
{