Hardcode depth limit for selective search

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index 4d7195b3e2290905b6d325da28507adcd80ea718..0ac38d0539f6bbc503ea26e5ada4e40c3863e5a9 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -129,18 +129,17 @@ namespace {
   };
 
 
-  /// Constants and variables
+  /// Constants and variables initialized from UCI options
 
   // Minimum number of full depth (i.e. non-reduced) moves at PV and non-PV
-  // nodes:
-  int LMRPVMoves = 15;
-  int LMRNonPVMoves = 4;
+  // nodes
+  int LMRPVMoves, LMRNonPVMoves;
 
-  // Depth limit for use of dynamic threat detection:
-  Depth ThreatDepth = 5*OnePly;
+  // Depth limit for use of dynamic threat detection
+  Depth ThreatDepth;
 
-  // Depth limit for selective search:
-  Depth SelectiveDepth = 7*OnePly;
+  // Depth limit for selective search
+  const Depth SelectiveDepth = 7*OnePly;
 
   // Use internal iterative deepening?
   const bool UseIIDAtPVNodes = true;
@@ -177,33 +176,28 @@ namespace {
   const bool PruneBlockingMoves = false;
 
   // Use futility pruning?
-  bool UseQSearchFutilityPruning = true;
-  bool UseFutilityPruning = true;
+  bool UseQSearchFutilityPruning, UseFutilityPruning;
 
   // Margins for futility pruning in the quiescence search, and at frontier
   // and near frontier nodes
-  Value FutilityMarginQS = Value(0x80);
+  Value FutilityMarginQS;
   Value FutilityMargins[6] = { Value(0x100), Value(0x200), Value(0x250),
                                Value(0x2A0), Value(0x340), Value(0x3A0) };
 
   // Razoring
   const bool RazorAtDepthOne = false;
-  Depth RazorDepth = 4*OnePly;
-  Value RazorMargin = Value(0x300);
+  Depth RazorDepth;
+  Value RazorMargin;
 
   // Last seconds noise filtering (LSN)
-  bool UseLSNFiltering = false;
+  bool UseLSNFiltering;
   bool looseOnTime = false;
-  int LSNTime = 4 * 1000; // In milliseconds
-  Value LSNValue = Value(0x200);
+  int LSNTime; // In milliseconds
+  Value LSNValue;
 
-  // Extensions.  Array index 0 is used at non-PV nodes, index 1 at PV nodes.
-  Depth CheckExtension[2] = {OnePly, OnePly};
-  Depth SingleReplyExtension[2] = {OnePly / 2, OnePly / 2};
-  Depth PawnPushTo7thExtension[2] = {OnePly / 2, OnePly / 2};
-  Depth PassedPawnExtension[2] = {Depth(0), Depth(0)};
-  Depth PawnEndgameExtension[2] = {OnePly, OnePly};
-  Depth MateThreatExtension[2] = {Depth(0), Depth(0)};
+  // Extensions. Array index 0 is used at non-PV nodes, index 1 at PV nodes.
+  Depth CheckExtension[2], SingleReplyExtension[2], PawnPushTo7thExtension[2];
+  Depth PassedPawnExtension[2], PawnEndgameExtension[2], MateThreatExtension[2];
 
   // Search depth at iteration 1
   const Depth InitialDepth = OnePly /*+ OnePly/2*/;
@@ -221,7 +215,7 @@ namespace {
   int BestMoveChangesByIteration[PLY_MAX_PLUS_2];
 
   // MultiPV mode
-  int MultiPV = 1;
+  int MultiPV;
 
   // Time managment variables
   int SearchStartTime;
@@ -241,15 +235,15 @@ namespace {
   int ExactMaxTime;
 
   // Show current line?
-  bool ShowCurrentLine = false;
+  bool ShowCurrentLine;
 
   // Log file
-  bool UseLogFile = false;
+  bool UseLogFile;
   std::ofstream LogFile;
 
   // MP related variables
-  Depth MinimumSplitDepth = 4*OnePly;
-  int MaxThreadsPerSplitPoint = 4;
+  Depth MinimumSplitDepth;
+  int MaxThreadsPerSplitPoint;
   Thread Threads[THREAD_MAX];
   Lock MPLock;
   bool AllThreadsShouldExit = false;
@@ -321,7 +315,7 @@ namespace {
 ////
 
 // The main transposition table
-TranspositionTable TT = TranspositionTable(TTDefaultSize);
+TranspositionTable TT;
 
 
 // Number of active threads:
@@ -432,7 +426,6 @@ void think(const Position &pos, bool infinite, bool ponder, int side_to_move,
   LMRPVMoves     = get_option_value_int("Full Depth Moves (PV nodes)") + 1;
   LMRNonPVMoves  = get_option_value_int("Full Depth Moves (non-PV nodes)") + 1;
   ThreatDepth    = get_option_value_int("Threat Depth") * OnePly;
-  SelectiveDepth = get_option_value_int("Selective Plies") * OnePly;
 
   Chess960 = get_option_value_bool("UCI_Chess960");
   ShowCurrentLine = get_option_value_bool("UCI_ShowCurrLine");
@@ -1197,7 +1190,7 @@ namespace {
         return bestValue;
 
     if (bestValue <= oldAlpha)
-        TT.store(pos, value_to_tt(bestValue, ply), depth, MOVE_NONE, VALUE_TYPE_UPPER);
+        TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_UPPER, depth, MOVE_NONE);
 
     else if (bestValue >= beta)
     {
@@ -1208,10 +1201,10 @@ namespace {
             update_history(pos, m, depth, movesSearched, moveCount);
             update_killers(m, ss[ply]);
         }
-        TT.store(pos, value_to_tt(bestValue, ply), depth, m, VALUE_TYPE_LOWER);
+        TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, depth, m);
     }
     else
-        TT.store(pos, value_to_tt(bestValue, ply), depth, ss[ply].pv[ply], VALUE_TYPE_EXACT);
+        TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_EXACT, depth, ss[ply].pv[ply]);
 
     return bestValue;
   }
@@ -1381,7 +1374,7 @@ namespace {
               continue;
 
           // Value based pruning
-          if (depth < 7 * OnePly && approximateEval < beta)
+          if (approximateEval < beta)
           {
               if (futilityValue == VALUE_NONE)
                   futilityValue =  evaluate(pos, ei, threadID)
@@ -1461,7 +1454,7 @@ namespace {
         return bestValue;
 
     if (bestValue < beta)
-        TT.store(pos, value_to_tt(bestValue, ply), depth, MOVE_NONE, VALUE_TYPE_UPPER);
+        TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_UPPER, depth, MOVE_NONE);
     else
     {
         BetaCounter.add(pos.side_to_move(), depth, threadID);
@@ -1471,7 +1464,7 @@ namespace {
             update_history(pos, m, depth, movesSearched, moveCount);
             update_killers(m, ss[ply]);
         }
-        TT.store(pos, value_to_tt(bestValue, ply), depth, m, VALUE_TYPE_LOWER);
+        TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, depth, m);
     }
 
     assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);
@@ -1550,7 +1543,7 @@ namespace {
     {
         // Store the score to avoid a future costly evaluation() call
         if (!isCheck && !tte && ei.futilityMargin == 0)
-            TT.store(pos, value_to_tt(bestValue, ply), Depth(-127*OnePly), MOVE_NONE, VALUE_TYPE_EVAL);
+            TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_EVAL, Depth(-127*OnePly), MOVE_NONE);
 
         return bestValue;
     }
@@ -1643,9 +1636,9 @@ namespace {
     {
         Depth d = (depth == Depth(0) ? Depth(0) : Depth(-1));
         if (bestValue < beta)
-            TT.store(pos, value_to_tt(bestValue, ply), d, MOVE_NONE, VALUE_TYPE_UPPER);
+            TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_UPPER, d, MOVE_NONE);
         else
-            TT.store(pos, value_to_tt(bestValue, ply), d, m, VALUE_TYPE_LOWER);
+            TT.store(pos, value_to_tt(bestValue, ply), VALUE_TYPE_LOWER, d, m);
     }
 
     // Update killers only for good check moves