X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fpawns.cpp;h=280c1fd6a99e569bcbb9ac4c633e6fd50a0f088e;hp=c1a93169bd7e394f3b3abffb1234a122864e479d;hb=b6e9d901b0f82e8500acfad590649bdad9a7756f;hpb=57b6df4874228ef6f0fc4d9b98e1db15b57000cf

diff --git a/src/pawns.cpp b/src/pawns.cpp
index c1a93169..280c1fd6 100644
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -30,40 +30,38 @@ namespace {
   #define S(mg, eg) make_score(mg, eg)
 
   // Doubled pawn penalty by opposed flag and file
-  const Score DoubledPawnPenalty[2][FILE_NB] = {
+  const Score Doubled[2][FILE_NB] = {
   { S(13, 43), S(20, 48), S(23, 48), S(23, 48),
     S(23, 48), S(23, 48), S(20, 48), S(13, 43) },
   { S(13, 43), S(20, 48), S(23, 48), S(23, 48),
     S(23, 48), S(23, 48), S(20, 48), S(13, 43) }};
 
   // Isolated pawn penalty by opposed flag and file
-  const Score IsolatedPawnPenalty[2][FILE_NB] = {
+  const Score Isolated[2][FILE_NB] = {
   { S(37, 45), S(54, 52), S(60, 52), S(60, 52),
     S(60, 52), S(60, 52), S(54, 52), S(37, 45) },
   { S(25, 30), S(36, 35), S(40, 35), S(40, 35),
     S(40, 35), S(40, 35), S(36, 35), S(25, 30) }};
 
   // Backward pawn penalty by opposed flag and file
-  const Score BackwardPawnPenalty[2][FILE_NB] = {
+  const Score Backward[2][FILE_NB] = {
   { S(30, 42), S(43, 46), S(49, 46), S(49, 46),
     S(49, 46), S(49, 46), S(43, 46), S(30, 42) },
   { S(20, 28), S(29, 31), S(33, 31), S(33, 31),
     S(33, 31), S(33, 31), S(29, 31), S(20, 28) }};
 
   // Pawn chain membership bonus by file
-  const Score ChainBonus[FILE_NB] = {
+  const Score ChainMember[FILE_NB] = {
     S(11,-1), S(13,-1), S(13,-1), S(14,-1),
     S(14,-1), S(13,-1), S(13,-1), S(11,-1)
   };
 
   // Candidate passed pawn bonus by rank
-  const Score CandidateBonus[RANK_NB] = {
+  const Score CandidatePassed[RANK_NB] = {
     S( 0, 0), S( 6, 13), S(6,13), S(14,29),
     S(34,68), S(83,166), S(0, 0), S( 0, 0)
   };
 
-  const Score PawnStructureWeight = S(233, 201);
-
   // Weakness of our pawn shelter in front of the king indexed by [king pawn][rank]
   const Value ShelterWeakness[2][RANK_NB] =
   { { V(141), V(0), V(38), V(102), V(128), V(141), V(141) },
@@ -103,8 +101,8 @@ namespace {
         f = file_of(s);
         r = rank_of(s);
 
-        // This file cannot be half open
-        e->halfOpenFiles[Us] &= ~(1 << f);
+        // This file cannot be semi-open
+        e->semiopenFiles[Us] &= ~(1 << f);
 
         // Our rank plus previous one. Used for chain detection
         b = rank_bb(r) | rank_bb(Us == WHITE ? r - Rank(1) : r + Rank(1));
@@ -161,21 +159,27 @@ namespace {
 
         // Score this pawn
         if (isolated)
-            value -= IsolatedPawnPenalty[opposed][f];
+            value -= Isolated[opposed][f];
 
         if (doubled)
-            value -= DoubledPawnPenalty[opposed][f];
+            value -= Doubled[opposed][f];
 
         if (backward)
-            value -= BackwardPawnPenalty[opposed][f];
+            value -= Backward[opposed][f];
 
         if (chain)
-            value += ChainBonus[f];
+            value += ChainMember[f];
 
         if (candidate)
-            value += CandidateBonus[relative_rank(Us, s)];
+            value += CandidatePassed[relative_rank(Us, s)];
     }
 
+    e->pawnsOnSquares[Us][BLACK] = popcount<Max15>(ourPawns & BlackSquares);
+    e->pawnsOnSquares[Us][WHITE] = pos.piece_count(Us, PAWN) - e->pawnsOnSquares[Us][BLACK];
+
+    e->pawnsOnSquares[Them][BLACK] = popcount<Max15>(theirPawns & BlackSquares);
+    e->pawnsOnSquares[Them][WHITE] = pos.piece_count(Them, PAWN) - e->pawnsOnSquares[Them][BLACK];
+
     return value;
   }
 }
@@ -200,7 +204,7 @@ Entry* probe(const Position& pos, Table& entries) {
   e->key = key;
   e->passedPawns[WHITE] = e->passedPawns[BLACK] = 0;
   e->kingSquares[WHITE] = e->kingSquares[BLACK] = SQ_NONE;
-  e->halfOpenFiles[WHITE] = e->halfOpenFiles[BLACK] = 0xFF;
+  e->semiopenFiles[WHITE] = e->semiopenFiles[BLACK] = 0xFF;
 
   Bitboard wPawns = pos.pieces(WHITE, PAWN);
   Bitboard bPawns = pos.pieces(BLACK, PAWN);
@@ -209,9 +213,6 @@ Entry* probe(const Position& pos, Table& entries) {
 
   e->value =  evaluate_pawns<WHITE>(pos, wPawns, bPawns, e)
             - evaluate_pawns<BLACK>(pos, bPawns, wPawns, e);
-
-  e->value = apply_weight(e->value, PawnStructureWeight);
-
   return e;
 }