X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fpawns.cpp;h=3ce896309f530f057daeacf6320bb35d9eb26517;hp=7b266e779cc5fb7c76bcd91f28403ff5aeb43aa2;hb=fb8095718bd0789d2743fa6216c6aa522555dc4b;hpb=353e20674b2019094059caaa3567e9a44abe9cd1

diff --git a/src/pawns.cpp b/src/pawns.cpp
index 7b266e77..3ce89630 100644
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -33,12 +33,13 @@ namespace {
 
   // Pawn penalties
   constexpr Score Backward      = S( 9, 24);
-  constexpr Score BlockedStorm  = S(82, 82);
   constexpr Score Doubled       = S(11, 56);
   constexpr Score Isolated      = S( 5, 15);
   constexpr Score WeakLever     = S( 0, 56);
   constexpr Score WeakUnopposed = S(13, 27);
 
+  constexpr Score BlockedStorm[RANK_NB]  = {S( 0, 0), S( 0, 0), S( 76, 78), S(-10, 15), S(-7, 10), S(-4, 6), S(-1, 2)};
+
   // Connected pawn bonus
   constexpr int Connected[RANK_NB] = { 0, 7, 8, 12, 29, 48, 86 };
 
@@ -86,6 +87,7 @@ namespace {
     e->passedPawns[Us] = 0;
     e->kingSquares[Us] = SQ_NONE;
     e->pawnAttacks[Us] = e->pawnAttacksSpan[Us] = pawn_attacks_bb<Us>(ourPawns);
+    e->blockedCount += popcount(shift<Up>(ourPawns) & (theirPawns | doubleAttackThem));
 
     // Loop through all pawns of the current color and score each pawn
     while ((s = *pl++) != SQ_NONE)
@@ -105,8 +107,6 @@ namespace {
         phalanx    = neighbours & rank_bb(s);
         support    = neighbours & rank_bb(s - Up);
 
-        e->blockedCount += blocked || more_than_one(leverPush);
-
         // A pawn is backward when it is behind all pawns of the same color on
         // the adjacent files and cannot safely advance.
         backward =  !(neighbours & forward_ranks_bb(Them, s + Up))
@@ -144,9 +144,16 @@ namespace {
         }
 
         else if (!neighbours)
+        {
             score -=   Isolated
                      + WeakUnopposed * !opposed;
 
+            if (   (ourPawns & forward_file_bb(Them, s))
+                && popcount(opposed) == 1
+                && !(theirPawns & adjacent_files_bb(s)))
+                score -= Doubled;
+        }
+
         else if (backward)
             score -=   Backward
                      + WeakUnopposed * !opposed;
@@ -194,7 +201,7 @@ Score Entry::evaluate_shelter(const Position& pos, Square ksq) {
   constexpr Color Them = ~Us;
 
   Bitboard b = pos.pieces(PAWN) & ~forward_ranks_bb(Them, ksq);
-  Bitboard ourPawns = b & pos.pieces(Us);
+  Bitboard ourPawns = b & pos.pieces(Us) & ~pawnAttacks[Them];
   Bitboard theirPawns = b & pos.pieces(Them);
 
   Score bonus = make_score(5, 5);
@@ -208,11 +215,11 @@ Score Entry::evaluate_shelter(const Position& pos, Square ksq) {
       b = theirPawns & file_bb(f);
       int theirRank = b ? relative_rank(Us, frontmost_sq(Them, b)) : 0;
 
-      File d = File(edge_distance(f));
+      int d = edge_distance(f);
       bonus += make_score(ShelterStrength[d][ourRank], 0);
 
       if (ourRank && (ourRank == theirRank - 1))
-          bonus -= BlockedStorm * int(theirRank == RANK_3);
+          bonus -= BlockedStorm[theirRank];
       else
           bonus -= make_score(UnblockedStorm[d][theirRank], 0);
   }