X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=76653ff99bf5fed6963d13b88a47ea202c17f4a2;hp=b9cbb956d823b9cb7bb30605bdd3524f46d608c2;hb=0e1ad3ad33c65be8cfb2702b3df5500ef9d2f87f;hpb=ea4e22be1da1ccbf316d27f2eb3b14d0e13388e4

diff --git a/src/search.cpp b/src/search.cpp
index b9cbb956..76653ff9 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2013 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -494,7 +494,7 @@ namespace {
     Move movesSearched[64];
     StateInfo st;
     const TTEntry *tte;
-    SplitPoint* sp;
+    SplitPoint* splitPoint;
     Key posKey;
     Move ttMove, move, excludedMove, bestMove, threatMove;
     Depth ext, newDepth;
@@ -511,15 +511,15 @@ namespace {
 
     if (SpNode)
     {
-        sp = ss->sp;
-        bestMove   = sp->bestMove;
-        threatMove = sp->threatMove;
-        bestValue  = sp->bestValue;
+        splitPoint = ss->splitPoint;
+        bestMove   = splitPoint->bestMove;
+        threatMove = splitPoint->threatMove;
+        bestValue  = splitPoint->bestValue;
         tte = NULL;
         ttMove = excludedMove = MOVE_NONE;
         ttValue = VALUE_NONE;
 
-        assert(sp->bestValue > -VALUE_INFINITE && sp->moveCount > 0);
+        assert(splitPoint->bestValue > -VALUE_INFINITE && splitPoint->moveCount > 0);
 
         goto split_point_start;
     }
@@ -794,8 +794,8 @@ split_point_start: // At split points actual search starts from here
           if (!pos.pl_move_is_legal(move, ci.pinned))
               continue;
 
-          moveCount = ++sp->moveCount;
-          sp->mutex.unlock();
+          moveCount = ++splitPoint->moveCount;
+          splitPoint->mutex.unlock();
       }
       else
           moveCount++;
@@ -857,21 +857,19 @@ split_point_start: // At split points actual search starts from here
       newDepth = depth - ONE_PLY + ext;
 
       // Step 13. Futility pruning (is omitted in PV nodes)
-      if (   !PvNode
-          && !captureOrPromotion
+      if (   !captureOrPromotion
           && !inCheck
           && !dangerous
-          &&  move != ttMove
-          && (bestValue > VALUE_MATED_IN_MAX_PLY || (   bestValue == -VALUE_INFINITE
-                                                     && alpha > VALUE_MATED_IN_MAX_PLY)))
+          &&  move != ttMove)
       {
           // Move count based pruning
-          if (   depth < 16 * ONE_PLY
+          if (   !PvNode
+              && depth < 16 * ONE_PLY
               && moveCount >= FutilityMoveCounts[depth]
               && (!threatMove || !refutes(pos, move, threatMove)))
           {
               if (SpNode)
-                  sp->mutex.lock();
+                  splitPoint->mutex.lock();
 
               continue;
           }
@@ -883,10 +881,10 @@ split_point_start: // At split points actual search starts from here
           futilityValue =  ss->staticEval + ss->evalMargin + futility_margin(predictedDepth, moveCount)
                          + Gain[pos.piece_moved(move)][to_sq(move)];
 
-          if (futilityValue < beta)
+          if (!PvNode && futilityValue < beta)
           {
               if (SpNode)
-                  sp->mutex.lock();
+                  splitPoint->mutex.lock();
 
               continue;
           }
@@ -896,7 +894,7 @@ split_point_start: // At split points actual search starts from here
               && pos.see_sign(move) < 0)
           {
               if (SpNode)
-                  sp->mutex.lock();
+                  splitPoint->mutex.lock();
 
               continue;
           }
@@ -929,7 +927,8 @@ split_point_start: // At split points actual search starts from here
       {
           ss->reduction = reduction<PvNode>(depth, moveCount);
           Depth d = std::max(newDepth - ss->reduction, ONE_PLY);
-          alpha = SpNode ? sp->alpha : alpha;
+          if (SpNode)
+              alpha = splitPoint->alpha;
 
           value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d);
 
@@ -942,7 +941,9 @@ split_point_start: // At split points actual search starts from here
       // Step 16. Full depth search, when LMR is skipped or fails high
       if (doFullDepthSearch)
       {
-          alpha = SpNode ? sp->alpha : alpha;
+          if (SpNode)
+              alpha = splitPoint->alpha;
+
           value = newDepth < ONE_PLY ?
                           givesCheck ? -qsearch<NonPV,  true>(pos, ss+1, -(alpha+1), -alpha, DEPTH_ZERO)
                                      : -qsearch<NonPV, false>(pos, ss+1, -(alpha+1), -alpha, DEPTH_ZERO)
@@ -965,9 +966,9 @@ split_point_start: // At split points actual search starts from here
       // Step 18. Check for new best move
       if (SpNode)
       {
-          sp->mutex.lock();
-          bestValue = sp->bestValue;
-          alpha = sp->alpha;
+          splitPoint->mutex.lock();
+          bestValue = splitPoint->bestValue;
+          alpha = splitPoint->alpha;
       }
 
       // Finished searching the move. If Signals.stop is true, the search
@@ -1002,20 +1003,20 @@ split_point_start: // At split points actual search starts from here
 
       if (value > bestValue)
       {
-          bestValue = SpNode ? sp->bestValue = value : value;
+          bestValue = SpNode ? splitPoint->bestValue = value : value;
 
           if (value > alpha)
           {
-              bestMove = SpNode ? sp->bestMove = move : move;
+              bestMove = SpNode ? splitPoint->bestMove = move : move;
 
               if (PvNode && value < beta) // Update alpha! Always alpha < beta
-                  alpha = SpNode ? sp->alpha = value : value;
+                  alpha = SpNode ? splitPoint->alpha = value : value;
               else
               {
                   assert(value >= beta); // Fail high
 
                   if (SpNode)
-                      sp->cutoff = true;
+                      splitPoint->cutoff = true;
 
                   break;
               }
@@ -1668,7 +1669,7 @@ void Thread::idle_loop() {
           Position pos(*sp->pos, this);
 
           memcpy(ss, sp->ss - 1, 4 * sizeof(Stack));
-          (ss+1)->sp = sp;
+          (ss+1)->splitPoint = sp;
 
           sp->mutex.lock();