X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=4493d7bcca9771ef05df1295ad0dcdf7b62b2f93;hp=4745da0210a921112852c3a3cb69192200660481;hb=1e4472b65124a2a190eb3c595d3b59ef07e57891;hpb=c8773c720af6fd5c3a8f84550ee36e5eb89f929e

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 4745da02..4493d7bc 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.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 Marco Costalba
+  Copyright (C) 2008-2009 Marco Costalba
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -39,23 +39,20 @@
 
 namespace {
 
-  const int Sign[2] = {1, -1};
+  const int Sign[2] = { 1, -1 };
 
-  // Evaluation grain size, must be a power of 2.
+  // Evaluation grain size, must be a power of 2
   const int GrainSize = 4;
 
-  // Evaluation weights
-  int WeightMobilityMidgame      = 0x100;
-  int WeightMobilityEndgame      = 0x100;
-  int WeightPawnStructureMidgame = 0x100;
-  int WeightPawnStructureEndgame = 0x100;
-  int WeightPassedPawnsMidgame   = 0x100;
-  int WeightPassedPawnsEndgame   = 0x100;
-  int WeightKingSafety[2] = { 0x100, 0x100 };
+  // Evaluation weights, initialized from UCI options
+  int WeightMobilityMidgame, WeightMobilityEndgame;
+  int WeightPawnStructureMidgame, WeightPawnStructureEndgame;
+  int WeightPassedPawnsMidgame, WeightPassedPawnsEndgame;
+  int WeightKingSafety[2];
   int WeightSpace;
 
-  // Internal evaluation weights.  These are applied on top of the evaluation
-  // weights read from UCI parameters.  The purpose is to be able to change
+  // Internal evaluation weights. These are applied on top of the evaluation
+  // weights read from UCI parameters. The purpose is to be able to change
   // the evaluation weights while keeping the default values of the UCI
   // parameters at 100, which looks prettier.
   //
@@ -86,7 +83,7 @@ namespace {
   };
 
   // Bishop mobility bonus in middle game and endgame, indexed by the number
-  // of attacked squares not occupied by friendly pieces.  X-ray attacks through
+  // of attacked squares not occupied by friendly pieces. X-ray attacks through
   // queens are also included.
   const Value MidgameBishopMobilityBonus[] = {
   //    0       1      2      3      4      5      6      7
@@ -103,7 +100,7 @@ namespace {
   };
 
   // Rook mobility bonus in middle game and endgame, indexed by the number
-  // of attacked squares not occupied by friendly pieces.  X-ray attacks through
+  // of attacked squares not occupied by friendly pieces. X-ray attacks through
   // queens and rooks are also included.
   const Value MidgameRookMobilityBonus[] = {
   //    0       1      2      3      4      5      6      7
@@ -178,38 +175,37 @@ namespace {
   const Value MidgameQueenOn7thBonus = Value(27);
   const Value EndgameQueenOn7thBonus = Value(54);
 
-
   // Rooks on open files
   const Value RookOpenFileBonus = Value(43);
   const Value RookHalfOpenFileBonus = Value(19);
 
   // Penalty for rooks trapped inside a friendly king which has lost the
-  // right to castle:
+  // right to castle.
   const Value TrappedRookPenalty = Value(180);
 
   // Penalty for a bishop on a7/h7 (a2/h2 for black) which is trapped by
-  // enemy pawns:
+  // enemy pawns.
   const Value TrappedBishopA7H7Penalty = Value(300);
 
-  // Bitboard masks for detecting trapped bishops on a7/h7 (a2/h2 for black):
+  // Bitboard masks for detecting trapped bishops on a7/h7 (a2/h2 for black)
   const Bitboard MaskA7H7[2] = {
     ((1ULL << SQ_A7) | (1ULL << SQ_H7)),
     ((1ULL << SQ_A2) | (1ULL << SQ_H2))
   };
 
   // Penalty for a bishop on a1/h1 (a8/h8 for black) which is trapped by
-  // a friendly pawn on b2/g2 (b7/g7 for black).  This can obviously only
+  // a friendly pawn on b2/g2 (b7/g7 for black). This can obviously only
   // happen in Chess960 games.
   const Value TrappedBishopA1H1Penalty = Value(100);
 
-  // Bitboard masks for detecting trapped bishops on a1/h1 (a8/h8 for black):
+  // Bitboard masks for detecting trapped bishops on a1/h1 (a8/h8 for black)
   const Bitboard MaskA1H1[2] = {
     ((1ULL << SQ_A1) | (1ULL << SQ_H1)),
     ((1ULL << SQ_A8) | (1ULL << SQ_H8))
   };
 
   // The SpaceMask[color] contains area of the board which is consdered by
-  // the space evaluation.  In the middle game, each side is given a bonus
+  // the space evaluation. In the middle game, each side is given a bonus
   // based on how many squares inside this area are safe and available for
   // friendly minor pieces.
   const Bitboard SpaceMask[2] = {
@@ -221,30 +217,26 @@ namespace {
     (1ULL<<SQ_C5) | (1ULL<<SQ_D5) | (1ULL<<SQ_E5) | (1ULL<<SQ_F5)
   };
 
-  /// King safety constants and variables.  The king safety scores are taken
-  /// from the array SafetyTable[].  Various little "meta-bonuses" measuring
+  /// King safety constants and variables. The king safety scores are taken
+  /// from the array SafetyTable[]. Various little "meta-bonuses" measuring
   /// the strength of the attack are added up into an integer, which is used
   /// as an index to SafetyTable[].
 
-  // Attack weights for each piece type.
+  // Attack weights for each piece type
   const int QueenAttackWeight  = 5;
   const int RookAttackWeight   = 3;
   const int BishopAttackWeight = 2;
   const int KnightAttackWeight = 2;
 
-  // Bonuses for safe checks for each piece type.
-  int QueenContactCheckBonus = 3;
-  int QueenCheckBonus        = 2;
-  int RookCheckBonus         = 1;
-  int BishopCheckBonus       = 1;
-  int KnightCheckBonus       = 1;
-  int DiscoveredCheckBonus   = 3;
+  // Bonuses for safe checks, initialized from UCI options
+  int QueenContactCheckBonus, DiscoveredCheckBonus;
+  int QueenCheckBonus, RookCheckBonus, BishopCheckBonus, KnightCheckBonus;
 
   // Scan for queen contact mates?
   const bool QueenContactMates = true;
 
-  // Bonus for having a mate threat.
-  int MateThreatBonus = 3;
+  // Bonus for having a mate threat, initialized from UCI options
+  int MateThreatBonus;
 
   // InitKingDanger[] contains bonuses based on the position of the defending
   // king.
@@ -259,19 +251,19 @@ namespace {
     15, 15, 15, 15, 15, 15, 15, 15
   };
 
-  // SafetyTable[] contains the actual king safety scores.  It is initialized
+  // SafetyTable[] contains the actual king safety scores. It is initialized
   // in init_safety().
   Value SafetyTable[100];
 
   // Pawn and material hash tables, indexed by the current thread id
-  PawnInfoTable *PawnTable[8] = {0, 0, 0, 0, 0, 0, 0, 0};
-  MaterialInfoTable *MaterialTable[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+  PawnInfoTable* PawnTable[8] = {0, 0, 0, 0, 0, 0, 0, 0};
+  MaterialInfoTable* MaterialTable[8] = {0, 0, 0, 0, 0, 0, 0, 0};
 
   // Sizes of pawn and material hash tables
   const int PawnTableSize = 16384;
   const int MaterialTableSize = 1024;
 
-  // Array which gives the number of nonzero bits in an 8-bit integer:
+  // Array which gives the number of nonzero bits in an 8-bit integer
   uint8_t BitCount8Bit[256];
 
   // Function prototypes
@@ -289,6 +281,7 @@ namespace {
 
   void evaluate_space(const Position &p, Color us, EvalInfo &ei);
   inline Value apply_weight(Value v, int w);
+  Value scale_by_game_phase(Value mv, Value ev, Phase ph, const ScaleFactor sf[]);
 
   int count_1s_8bit(Bitboard b);
 
@@ -489,7 +482,10 @@ void init_eval(int threads) {
   }
 
   for (Bitboard b = 0ULL; b < 256ULL; b++)
-      BitCount8Bit[b] = count_1s(b);
+  {
+      assert(count_1s(b) == int(uint8_t(count_1s(b))));
+      BitCount8Bit[b] = (uint8_t)count_1s(b);
+  }
 }
 
 
@@ -501,6 +497,8 @@ void quit_eval() {
   {
       delete PawnTable[i];
       delete MaterialTable[i];
+      PawnTable[i] = NULL;
+      MaterialTable[i] = NULL;
   }
 }
 
@@ -527,22 +525,6 @@ void read_weights(Color us) {
 }
 
 
-/// scale_by_game_phase() interpolates between a middle game and an endgame
-/// score, based on game phase.  It also scales the return value by a
-/// ScaleFactor array.
-
-Value scale_by_game_phase(Value mv, Value ev, Phase ph, const ScaleFactor sf[]) {
-
-  assert(mv > -VALUE_INFINITE && mv < VALUE_INFINITE);
-  assert(ev > -VALUE_INFINITE && ev < VALUE_INFINITE);
-  assert(ph >= PHASE_ENDGAME && ph <= PHASE_MIDGAME);
-
-  ev = apply_scale_factor(ev, sf[(ev > Value(0) ? WHITE : BLACK)]);
-
-  Value result = Value(int((mv * ph + ev * (128 - ph)) / 128));
-  return Value(int(result) & ~(GrainSize - 1));
-}
-
 namespace {
 
   // evaluate_common() computes terms common to all pieces attack
@@ -581,25 +563,25 @@ namespace {
     ei.egMobility += Sign[us] * EgBonus[Piece][mob];
 
     // Bishop and Knight outposts
-    if (  (Piece != BISHOP && Piece != KNIGHT) // compile time condition
-        || !p.square_is_weak(s, them))
-        return mob;
-
-    // Initial bonus based on square
-    Value v, bonus;
-    v = bonus = OutpostBonus[Piece][relative_square(us, s)];
-
-    // Increase bonus if supported by pawn, especially if the opponent has
-    // no minor piece which can exchange the outpost piece
-    if (v && (p.pawn_attacks(them, s) & p.pawns(us)))
+    if (   (Piece == BISHOP || Piece == KNIGHT) // compile time condition
+        && p.square_is_weak(s, them))
     {
-        bonus += v / 2;
-        if (   p.piece_count(them, KNIGHT) == 0
-            && (SquaresByColorBB[square_color(s)] & p.bishops(them)) == EmptyBoardBB)
-            bonus += v;
+        // Initial bonus based on square
+        Value v, bonus;
+        v = bonus = OutpostBonus[Piece][relative_square(us, s)];
+
+        // Increase bonus if supported by pawn, especially if the opponent has
+        // no minor piece which can exchange the outpost piece
+        if (v && (p.pawn_attacks(them, s) & p.pawns(us)))
+        {
+            bonus += v / 2;
+            if (   p.piece_count(them, KNIGHT) == 0
+                   && (SquaresByColorBB[square_color(s)] & p.bishops(them)) == EmptyBoardBB)
+                bonus += v;
+        }
+        ei.mgValue += Sign[us] * bonus;
+        ei.egValue += Sign[us] * bonus;
     }
-    ei.mgValue += Sign[us] * bonus;
-    ei.egValue += Sign[us] * bonus;
     return mob;
   }
 
@@ -641,63 +623,63 @@ namespace {
                 evaluate_trapped_bishop_a1h1(pos, s, us, ei);
         }
 
-        if (Piece != ROOK && Piece != QUEEN)
-            continue;
-
-        // Queen or rook on 7th rank
-        them = opposite_color(us);
-
-        if (   relative_rank(us, s) == RANK_7
-            && relative_rank(us, pos.king_square(them)) == RANK_8)
+        if (Piece == ROOK || Piece == QUEEN)
         {
-            ei.mgValue += Sign[us] * (Piece == ROOK ? MidgameRookOn7thBonus : MidgameQueenOn7thBonus);
-            ei.egValue += Sign[us] * (Piece == ROOK ? EndgameRookOn7thBonus : EndgameQueenOn7thBonus);
+            // Queen or rook on 7th rank
+            them = opposite_color(us);
+
+            if (   relative_rank(us, s) == RANK_7
+                && relative_rank(us, pos.king_square(them)) == RANK_8)
+            {
+                ei.mgValue += Sign[us] * (Piece == ROOK ? MidgameRookOn7thBonus : MidgameQueenOn7thBonus);
+                ei.egValue += Sign[us] * (Piece == ROOK ? EndgameRookOn7thBonus : EndgameQueenOn7thBonus);
+            }
         }
 
         // Special extra evaluation for rooks
-        if (Piece != ROOK)
-            continue;
-
-        // Open and half-open files
-        f = square_file(s);
-        if (ei.pi->file_is_half_open(us, f))
+        if (Piece == ROOK)
         {
-            if (ei.pi->file_is_half_open(them, f))
-            {
-                ei.mgValue += Sign[us] * RookOpenFileBonus;
-                ei.egValue += Sign[us] * RookOpenFileBonus;
-            }
-            else
+            // Open and half-open files
+            f = square_file(s);
+            if (ei.pi->file_is_half_open(us, f))
             {
-                ei.mgValue += Sign[us] * RookHalfOpenFileBonus;
-                ei.egValue += Sign[us] * RookHalfOpenFileBonus;
+                if (ei.pi->file_is_half_open(them, f))
+                {
+                    ei.mgValue += Sign[us] * RookOpenFileBonus;
+                    ei.egValue += Sign[us] * RookOpenFileBonus;
+                }
+                else
+                {
+                    ei.mgValue += Sign[us] * RookHalfOpenFileBonus;
+                    ei.egValue += Sign[us] * RookHalfOpenFileBonus;
+                }
             }
-        }
 
-        // Penalize rooks which are trapped inside a king. Penalize more if
-        // king has lost right to castle.
-        if (mob > 6 || ei.pi->file_is_half_open(us, f))
-            continue;
+            // Penalize rooks which are trapped inside a king. Penalize more if
+            // king has lost right to castle.
+            if (mob > 6 || ei.pi->file_is_half_open(us, f))
+                continue;
 
-        ksq = pos.king_square(us);
+            ksq = pos.king_square(us);
 
-        if (    square_file(ksq) >= FILE_E
-            &&  square_file(s) > square_file(ksq)
-            && (relative_rank(us, ksq) == RANK_1 || square_rank(ksq) == square_rank(s)))
-        {
-            // Is there a half-open file between the king and the edge of the board?
-            if (!ei.pi->has_open_file_to_right(us, square_file(ksq)))
-                ei.mgValue -= pos.can_castle(us)? Sign[us] * ((TrappedRookPenalty - mob * 16) / 2)
-                                                : Sign[us] *  (TrappedRookPenalty - mob * 16);
-        }
-        else if (    square_file(ksq) <= FILE_D
-                 &&  square_file(s) < square_file(ksq)
-                 && (relative_rank(us, ksq) == RANK_1 || square_rank(ksq) == square_rank(s)))
-        {
-            // Is there a half-open file between the king and the edge of the board?
-            if (!ei.pi->has_open_file_to_left(us, square_file(ksq)))
-                ei.mgValue -= pos.can_castle(us)? Sign[us] * ((TrappedRookPenalty - mob * 16) / 2)
-                                                : Sign[us] * (TrappedRookPenalty - mob * 16);
+            if (    square_file(ksq) >= FILE_E
+                &&  square_file(s) > square_file(ksq)
+                && (relative_rank(us, ksq) == RANK_1 || square_rank(ksq) == square_rank(s)))
+            {
+                // Is there a half-open file between the king and the edge of the board?
+                if (!ei.pi->has_open_file_to_right(us, square_file(ksq)))
+                    ei.mgValue -= pos.can_castle(us)? Sign[us] * ((TrappedRookPenalty - mob * 16) / 2)
+                                                    : Sign[us] *  (TrappedRookPenalty - mob * 16);
+            }
+            else if (    square_file(ksq) <= FILE_D
+                    &&  square_file(s) < square_file(ksq)
+                    && (relative_rank(us, ksq) == RANK_1 || square_rank(ksq) == square_rank(s)))
+            {
+                // Is there a half-open file between the king and the edge of the board?
+                if (!ei.pi->has_open_file_to_left(us, square_file(ksq)))
+                    ei.mgValue -= pos.can_castle(us)? Sign[us] * ((TrappedRookPenalty - mob * 16) / 2)
+                                                    : Sign[us] * (TrappedRookPenalty - mob * 16);
+            }
         }
     }
   }
@@ -719,11 +701,19 @@ namespace {
     // King shelter
     if (relative_rank(us, s) <= RANK_4)
     {
-        Bitboard pawns = p.pawns(us) & this_and_neighboring_files_bb(s);
-        Rank r = square_rank(s);
-        for (int i = 1; i < 4; i++)
-            shelter += count_1s_8bit(shiftRowsDown(pawns, r+i*sign)) * (128>>i);
-
+        // Shelter cache lookup
+        shelter = ei.pi->kingShelter(us, s);
+        if (shelter == -1)
+        {
+            shelter = 0;
+            Bitboard pawns = p.pawns(us) & this_and_neighboring_files_bb(s);
+            Rank r = square_rank(s);
+            for (int i = 1; i < 4; i++)
+                shelter += count_1s_8bit(shiftRowsDown(pawns, r+i*sign)) * (128>>i);
+
+            // Cache shelter value in pawn info
+            ei.pi->setKingShelter(us, s, shelter);
+        }
         ei.mgValue += sign * Value(shelter);
     }
 
@@ -794,7 +784,7 @@ namespace {
                         if (    bit_is_set(p.piece_attacks<QUEEN>(from), to)
                             && !bit_is_set(p.pinned_pieces(them), from)
                             && !(rook_attacks_bb(to, occ & ClearMaskBB[from]) & p.rooks_and_queens(us))
-                            && !(rook_attacks_bb(to, occ & ClearMaskBB[from]) & p.rooks_and_queens(us)))
+                            && !(bishop_attacks_bb(to, occ & ClearMaskBB[from]) & p.bishops_and_queens(us)))
 
                             ei.mateThreat[them] = make_move(from, to);
                     }
@@ -1159,6 +1149,23 @@ namespace {
   }
 
 
+  // scale_by_game_phase() interpolates between a middle game and an endgame
+  // score, based on game phase.  It also scales the return value by a
+  // ScaleFactor array.
+
+  Value scale_by_game_phase(Value mv, Value ev, Phase ph, const ScaleFactor sf[]) {
+
+    assert(mv > -VALUE_INFINITE && mv < VALUE_INFINITE);
+    assert(ev > -VALUE_INFINITE && ev < VALUE_INFINITE);
+    assert(ph >= PHASE_ENDGAME && ph <= PHASE_MIDGAME);
+
+    ev = apply_scale_factor(ev, sf[(ev > Value(0) ? WHITE : BLACK)]);
+
+    Value result = Value(int((mv * ph + ev * (128 - ph)) / 128));
+    return Value(int(result) & ~(GrainSize - 1));
+  }
+
+
   // count_1s_8bit() counts the number of nonzero bits in the 8 least
   // significant bits of a Bitboard. This function is used by the king
   // shield evaluation.