Merge branch 'master' of free2.projectlocker.com:sf

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index f1bfa5c6cd867fe55ef3c3a85f1db79ff08d655c..b9f9ff505098acc04f7c221fb46779af34bcd5a1 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -148,10 +148,6 @@ namespace {
 
   #undef S
 
-  // Threats weights indexed by sente (side to move has a bigger weight)
-  const int ConcurrentThreatsWeight[2] = { 3, 15 };
-  const int ThreatsWeight[2] = { 249, 267 };
-
   // Bonus for unstoppable passed pawns
   const Value UnstoppablePawnValue = Value(0x500);
 
@@ -244,7 +240,7 @@ namespace {
 
   // Function prototypes
   template<bool HasPopCnt>
-  Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID);
+  Value do_evaluate(const Position& pos, EvalInfo& ei);
 
   template<Color Us, bool HasPopCnt>
   void init_attack_tables(const Position& pos, EvalInfo& ei);
@@ -281,21 +277,21 @@ namespace {
 /// evaluate() is the main evaluation function. It always computes two
 /// values, an endgame score and a middle game score, and interpolates
 /// between them based on the remaining material.
-Value evaluate(const Position& pos, EvalInfo& ei, int threadID) {
+Value evaluate(const Position& pos, EvalInfo& ei) {
 
-    return CpuHasPOPCNT ? do_evaluate<true>(pos, ei, threadID)
-                        : do_evaluate<false>(pos, ei, threadID);
+    return CpuHasPOPCNT ? do_evaluate<true>(pos, ei)
+                        : do_evaluate<false>(pos, ei);
 }
 
 namespace {
 
 template<bool HasPopCnt>
-Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID) {
+Value do_evaluate(const Position& pos, EvalInfo& ei) {
 
   ScaleFactor factor[2];
 
   assert(pos.is_ok());
-  assert(threadID >= 0 && threadID < MAX_THREADS);
+  assert(pos.thread() >= 0 && pos.thread() < MAX_THREADS);
   assert(!pos.is_check());
 
   memset(&ei, 0, sizeof(EvalInfo));
@@ -305,7 +301,7 @@ Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID) {
   ei.value = pos.value();
 
   // Probe the material hash table
-  ei.mi = MaterialTable[threadID]->get_material_info(pos);
+  ei.mi = MaterialTable[pos.thread()]->get_material_info(pos);
   ei.value += ei.mi->material_value();
 
   // If we have a specialized evaluation function for the current material
@@ -318,7 +314,7 @@ Value do_evaluate(const Position& pos, EvalInfo& ei, int threadID) {
   factor[BLACK] = ei.mi->scale_factor(pos, BLACK);
 
   // Probe the pawn hash table
-  ei.pi = PawnTable[threadID]->get_pawn_info(pos);
+  ei.pi = PawnTable[pos.thread()]->get_pawn_info(pos);
   ei.value += apply_weight(ei.pi->pawns_value(), Weights[PawnStructure]);
 
   // Initialize attack bitboards with pawns evaluation
@@ -640,8 +636,6 @@ namespace {
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
     Bitboard b;
-    Value mg, eg;
-    int sente, threatCount = 0;
     Score bonus = make_score(0, 0);
 
     // Enemy pieces not defended by a pawn and under our attack
@@ -660,20 +654,9 @@ namespace {
         if (b)
             for (PieceType pt2 = PAWN; pt2 < KING; pt2++)
                 if (b & pos.pieces(pt2))
-                {
                     bonus += ThreatBonus[pt1][pt2];
-                    threatCount++;
-                }
     }
-
-    sente = (Us == pos.side_to_move());
-
-    // Non linear threat evaluation. Increase threats score according to the
-    // number of concurrent threats and to the side to move.
-    mg = (mg_value(bonus) + mg_value(bonus) * ConcurrentThreatsWeight[sente] * threatCount / 256) * ThreatsWeight[sente] / 256;
-    eg = (eg_value(bonus) + eg_value(bonus) * ConcurrentThreatsWeight[sente] * threatCount / 256) * ThreatsWeight[sente] / 256;
-
-    ei.value += Sign[Us] * make_score(mg, eg);
+    ei.value += Sign[Us] * bonus;
   }