X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=49dc07fe671ef0885ca9b5fbfd29a8fd2cc885ad;hp=9756add8278d01fd5fece9ac98fe620a255ab2ce;hb=588670e8d2ed5735300c5549ef754ceb09f1f461;hpb=3cf6471738dc704ddf553d5f8d2dc9875c2ccbe7

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 9756add8..49dc07fe 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -75,8 +75,8 @@ namespace {
   const int GrainSize = 8;
 
   // Evaluation weights, initialized from UCI options
-  enum { Mobility, PassedPawns, Space, KingDangerUs, KingDangerThem };
-  Score Weights[6];
+  enum { Mobility, PassedPawns, Space };
+  Score Weights[3];
 
   typedef Value V;
   #define S(mg, eg) make_score(mg, eg)
@@ -88,7 +88,7 @@ namespace {
   //
   // Values modified by Joona Kiiski
   const Score WeightsInternal[] = {
-      S(252, 344), S(216, 266), S(46, 0), S(247, 0), S(259, 0)
+      S(252, 344), S(216, 266), S(46, 0)
   };
 
   // MobilityBonus[PieceType][attacked] contains mobility bonuses for middle and
@@ -195,6 +195,10 @@ namespace {
   // the strength of the enemy attack are added up into an integer, which
   // is used as an index to KingDangerTable[].
   //
+  // King safety evaluation is asymmetrical and different for us (root color)
+  // and for our opponent. These values are used to init KingDangerTable.
+  const int KingDangerWeights[] = { 259, 247 };
+
   // KingAttackWeights[PieceType] contains king attack weights by piece type
   const int KingAttackWeights[] = { 0, 0, 2, 2, 3, 5 };
 
@@ -281,19 +285,16 @@ namespace Eval {
 
   void init() {
 
-    Weights[Mobility]       = weight_option("Mobility (Middle Game)", "Mobility (Endgame)", WeightsInternal[Mobility]);
-    Weights[PassedPawns]    = weight_option("Passed Pawns (Middle Game)", "Passed Pawns (Endgame)", WeightsInternal[PassedPawns]);
-    Weights[Space]          = weight_option("Space", "Space", WeightsInternal[Space]);
-    Weights[KingDangerUs]   = weight_option("Cowardice", "Cowardice", WeightsInternal[KingDangerUs]);
-    Weights[KingDangerThem] = weight_option("Aggressiveness", "Aggressiveness", WeightsInternal[KingDangerThem]);
-
-    // King safety is asymmetrical. Our king danger level is weighted by
-    // "Cowardice" UCI parameter, instead the opponent one by "Aggressiveness".
-    // If running in analysis mode, make sure we use symmetrical king safety. We
-    // do this by replacing both Weights[kingDangerUs] and Weights[kingDangerThem]
-    // by their average.
+    Weights[Mobility]    = weight_option("Mobility (Middle Game)", "Mobility (Endgame)", WeightsInternal[Mobility]);
+    Weights[PassedPawns] = weight_option("Passed Pawns (Middle Game)", "Passed Pawns (Endgame)", WeightsInternal[PassedPawns]);
+    Weights[Space]       = weight_option("Space", "Space", WeightsInternal[Space]);
+
+    int KingDanger[] = { KingDangerWeights[0], KingDangerWeights[1] };
+
+    // If running in analysis mode, make sure we use symmetrical king safety.
+    // We do so by replacing both KingDanger weights by their average.
     if (Options["UCI_AnalyseMode"])
-        Weights[KingDangerUs] = Weights[KingDangerThem] = (Weights[KingDangerUs] + Weights[KingDangerThem]) / 2;
+        KingDanger[0] = KingDanger[1] = (KingDanger[0] + KingDanger[1]) / 2;
 
     const int MaxSlope = 30;
     const int Peak = 1280;
@@ -302,8 +303,8 @@ namespace Eval {
     {
         t = std::min(Peak, std::min(int(0.4 * i * i), t + MaxSlope));
 
-        KingDangerTable[1][i] = apply_weight(make_score(t, 0), Weights[KingDangerUs]);
-        KingDangerTable[0][i] = apply_weight(make_score(t, 0), Weights[KingDangerThem]);
+        KingDangerTable[0][i] = apply_weight(make_score(t, 0), make_score(KingDanger[0], 0));
+        KingDangerTable[1][i] = apply_weight(make_score(t, 0), make_score(KingDanger[1], 0));
     }
   }
 
@@ -1146,7 +1147,11 @@ Value do_evaluate(const Position& pos, Value& margin) {
     behind |= (Us == WHITE ? behind >>  8 : behind <<  8);
     behind |= (Us == WHITE ? behind >> 16 : behind << 16);
 
-    return popcount<Max15>(safe) + popcount<Max15>(behind & safe);
+    // Since SpaceMask[Us] is fully on our half of the board
+    assert(unsigned(safe >> (Us == WHITE ? 32 : 0)) == 0);
+
+    // Count safe + (behind & safe) with a single popcount
+    return popcount<Full>((Us == WHITE ? safe << 32 : safe >> 32) | (behind & safe));
   }