X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=297d8c65070c0118d71e4a54f819dcf72e19e6d5;hp=6128b45fcad597e7c2ddad68f2ca4b55364f622d;hb=0e508f30bb2129f87b41ab3d721fd0400631f6fc;hpb=68209c9121b54760f03e5f00d6698bca190706ed

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 6128b45f..297d8c65 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -151,9 +151,6 @@ namespace {
     S(-30,-14), S(-9, -8), S( 0,  9), S( -1,  7)
   };
 
-  // PassedDanger[Rank] contains a term to weight the passed score
-  constexpr int PassedDanger[RANK_NB] = { 0, 0, 0, 3, 7, 11, 20 };
-
   // Assorted bonuses and penalties
   constexpr Score BishopPawns        = S(  3,  7);
   constexpr Score CloseEnemies       = S(  6,  0);
@@ -260,6 +257,7 @@ namespace {
     attackedBy[Us][PAWN] = pe->pawn_attacks(Us);
     attackedBy[Us][ALL_PIECES] = attackedBy[Us][KING] | attackedBy[Us][PAWN];
     attackedBy2[Us]            = attackedBy[Us][KING] & attackedBy[Us][PAWN];
+    kingRing[Us] = kingAttackersCount[Them] = 0;
 
     // Init our king safety tables only if we are going to use them
     if (pos.non_pawn_material(Them) >= RookValueMg + KnightValueMg)
@@ -277,8 +275,6 @@ namespace {
         kingAttackersCount[Them] = popcount(kingRing[Us] & pe->pawn_attacks(Them));
         kingAttacksCount[Them] = kingAttackersWeight[Them] = 0;
     }
-    else
-        kingRing[Us] = kingAttackersCount[Them] = 0;
   }
 
 
@@ -418,7 +414,7 @@ namespace {
     Score score = pe->king_safety<Us>(pos);
 
     // Find the squares that opponent attacks in our king flank, and the squares
-    // which are attacked twice in that flank but not defended by our pawns.
+    // which are attacked twice in that flank.
     kingFlank = KingFlank[file_of(ksq)];
     b1 = attackedBy[Them][ALL_PIECES] & kingFlank & Camp;
     b2 = b1 & attackedBy2[Them];
@@ -629,12 +625,12 @@ namespace {
         assert(!(pos.pieces(Them, PAWN) & forward_file_bb(Us, s + Up)));
 
         int r = relative_rank(Us, s);
-        int w = PassedDanger[r];
 
         Score bonus = PassedRank[r];
 
-        if (w)
+        if (r > RANK_3)
         {
+            int w = (r-2) * (r-2) + 2;
             Square blockSq = s + Up;
 
             // Adjust bonus based on the king's proximity
@@ -675,7 +671,7 @@ namespace {
 
                 bonus += make_score(k * w, k * w);
             }
-        } // w != 0
+        } // rank > RANK_3
 
         // Scale down bonus for candidate passers which need more than one
         // pawn push to become passed, or have a pawn in front of them.