X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fsearch.cpp;h=6d332c5ecc24fd867654679ae070267abf07d899;hp=03d05796ae69bd2df092183764604e9ac7f1d85d;hb=55df3fa2d7631ed67e46f9433aa7f3a71c18e5e7;hpb=dd5b3086f5f10819c527aa6276ca7a0c54e47900

diff --git a/src/search.cpp b/src/search.cpp
index 03d05796..6d332c5e 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -218,7 +218,7 @@ void Search::think() {
   if (Options["Use Search Log"])
   {
       Log log(Options["Search Log Filename"]);
-      log << "\nSearching: "  << RootPos.to_fen()
+      log << "\nSearching: "  << RootPos.fen()
           << "\ninfinite: "   << Limits.infinite
           << " ponder: "      << Limits.ponder
           << " time: "        << Limits.time[RootColor]
@@ -391,7 +391,8 @@ namespace {
 
             // Sort the PV lines searched so far and update the GUI
             sort<RootMove>(RootMoves.begin(), RootMoves.begin() + PVIdx + 1);
-            sync_cout << uci_pv(pos, depth, alpha, beta) << sync_endl;
+            if (PVIdx + 1 == PVSize || Time::now() - SearchTime > 3000)
+                sync_cout << uci_pv(pos, depth, alpha, beta) << sync_endl;
         }
 
         // Do we need to pick now the sub-optimal best move ?
@@ -793,7 +794,7 @@ split_point_start: // At split points actual search starts from here
       {
           Signals.firstRootMove = (moveCount == 1);
 
-          if (thisThread == Threads.main_thread() && Time::now() - SearchTime > 2000)
+          if (thisThread == Threads.main_thread() && Time::now() - SearchTime > 3000)
               sync_cout << "info depth " << depth / ONE_PLY
                         << " currmove " << move_to_uci(move, pos.is_chess960())
                         << " currmovenumber " << moveCount + PVIdx << sync_endl;
@@ -1003,8 +1004,10 @@ split_point_start: // At split points actual search starts from here
                   alpha = value; // Update alpha here! Always alpha < beta
                   if (SpNode) sp->alpha = value;
               }
-              else // Fail high
+              else
               {
+                  assert(value >= beta); // Fail high
+
                   if (SpNode) sp->cutoff = true;
                   break;
               }
@@ -1016,8 +1019,12 @@ split_point_start: // At split points actual search starts from here
           &&  depth >= Threads.min_split_depth()
           &&  bestValue < beta
           &&  Threads.available_slave_exists(thisThread))
+      {
           bestValue = Threads.split<FakeSplit>(pos, ss, alpha, beta, bestValue, &bestMove,
                                                depth, threatMove, moveCount, mp, NT);
+          if (bestValue >= beta)
+              break;
+      }
     }
 
     if (SpNode)
@@ -1097,12 +1104,17 @@ split_point_start: // At split points actual search starts from here
     const TTEntry* tte;
     Key posKey;
     Move ttMove, move, bestMove;
-    Value bestValue, value, ttValue, futilityValue, futilityBase;
-    bool givesCheck, enoughMaterial, evasionPrunable;
+    Value bestValue, value, ttValue, futilityValue, futilityBase, oldAlpha;
+    bool givesCheck, enoughMaterial, evasionPrunable, fromNull;
     Depth ttDepth;
 
+    // To flag BOUND_EXACT a node with eval above alpha and no available moves
+    if (PvNode)
+        oldAlpha = alpha;
+
     ss->currentMove = bestMove = MOVE_NONE;
     ss->ply = (ss-1)->ply + 1;
+    fromNull = (ss-1)->currentMove == MOVE_NULL;
 
     // Check for an instant draw or maximum ply reached
     if (pos.is_draw<false, false>() || ss->ply > MAX_PLY)
@@ -1140,7 +1152,12 @@ split_point_start: // At split points actual search starts from here
     }
     else
     {
-        if (tte)
+        if (fromNull)
+        {
+            ss->staticEval = bestValue = -(ss-1)->staticEval;
+            ss->evalMargin = VALUE_ZERO;
+        }
+        else if (tte)
         {
             assert(tte->static_value() != VALUE_NONE || Threads.size() > 1);
 
@@ -1188,6 +1205,7 @@ split_point_start: // At split points actual search starts from here
       if (   !PvNode
           && !InCheck
           && !givesCheck
+          && !fromNull
           &&  move != ttMove
           &&  enoughMaterial
           &&  type_of(move) != PROMOTION
@@ -1280,7 +1298,7 @@ split_point_start: // At split points actual search starts from here
         return mated_in(ss->ply); // Plies to mate from the root
 
     TT.store(posKey, value_to_tt(bestValue, ss->ply),
-             PvNode && bestMove != MOVE_NONE ? BOUND_EXACT : BOUND_UPPER,
+             PvNode && bestValue > oldAlpha ? BOUND_EXACT : BOUND_UPPER,
              ttDepth, bestMove, ss->staticEval, ss->evalMargin);
 
     assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);