X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fpawns.cpp;h=1ccc0958ca432e870629231b9676651f4765710b;hp=86745924bcfe2f308f04a1f9290a7b22d399f27b;hb=ab0f4c03539b151f07d99a5336e47e8dbdc63c6e;hpb=29b5842da8d5477c0aea924cfd364c9e619456a2

diff --git a/src/pawns.cpp b/src/pawns.cpp
index 86745924..1ccc0958 100644
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -31,12 +31,8 @@ namespace {
   #define V Value
   #define S(mg, eg) make_score(mg, eg)
 
-  // Isolated pawn penalty by opposed flag and file
-  const Score Isolated[2][FILE_NB] = {
-    { S(31, 36), S(45, 41), S(50, 41), S(50, 41),
-      S(50, 41), S(50, 41), S(45, 41), S(31, 36) },
-    { S(21, 24), S(30, 28), S(33, 28), S(33, 28),
-      S(33, 28), S(33, 28), S(30, 28), S(21, 24) } };
+  // Isolated pawn penalty by opposed flag
+  const Score Isolated[2] = { S(45, 40), S(30, 27) };
 
   // Backward pawn penalty by opposed flag
   const Score Backward[2] = { S(56, 33), S(41, 19) };
@@ -48,10 +44,8 @@ namespace {
   // Connected pawn bonus by opposed, phalanx, twice supported and rank
   Score Connected[2][2][2][RANK_NB];
 
-  // Doubled pawn penalty by file
-  const Score Doubled[FILE_NB] = {
-    S(11, 34), S(17, 38), S(19, 38), S(19, 38),
-    S(19, 38), S(19, 38), S(17, 38), S(11, 34) };
+  // Doubled pawn penalty
+  const Score Doubled = S(18,38);
 
   // Lever bonus by rank
   const Score Lever[RANK_NB] = {
@@ -130,7 +124,7 @@ namespace {
         opposed    = theirPawns & forward_bb(Us, s);
         stoppers   = theirPawns & passed_pawn_mask(Us, s);
         lever      = theirPawns & pawnAttacksBB[s];
-        doubled    = ourPawns   & forward_bb(Us, s);
+        doubled    = ourPawns   & (s + Up);
         neighbours = ourPawns   & adjacent_files_bb(f);
         phalanx    = neighbours & rank_bb(s);
         supported  = neighbours & rank_bb(s - Up);
@@ -149,19 +143,19 @@ namespace {
             // either there is a stopper in the way on this rank, or there is a
             // stopper on adjacent file which controls the way to that rank.
             backward = (b | shift_bb<Up>(b & adjacent_files_bb(f))) & stoppers;
-            
+
             assert(!backward || !(pawn_attack_span(Them, s + Up) & neighbours));
         }
 
         // Passed pawns will be properly scored in evaluation because we need
         // full attack info to evaluate them. Only the frontmost passed
         // pawn on each file is considered a true passed pawn.
-        if (!(stoppers | doubled))
+        if (!(stoppers | doubled)) // FIXME this is just doubled by adjacent pawn
             e->passedPawns[Us] |= s;
 
         // Score this pawn
         if (!neighbours)
-            score -= Isolated[opposed][f];
+            score -= Isolated[opposed];
 
         else if (backward)
             score -= Backward[opposed];
@@ -173,7 +167,7 @@ namespace {
             score += Connected[opposed][!!phalanx][more_than_one(supported)][relative_rank(Us, s)];
 
         if (doubled)
-            score -= Doubled[f] / distance<Rank>(s, frontmost_sq(Us, doubled));
+            score -= Doubled;
 
         if (lever)
             score += Lever[relative_rank(Us, s)];