Add KnightAttacksRooksBonus

lynx-chess · Nov 22, 2024 · 7a86eec · 7a86eec
1 parent b921c36
commit 7a86eec
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Showing 3 changed files with 5 additions and 7 deletions.
diff --git a/...Lynx/Generated/Lynx.Generator/Lynx.Generator.GeneratedPackGenerator/EvaluationParams.g.cs b/...Lynx/Generated/Lynx.Generator/Lynx.Generator.GeneratedPackGenerator/EvaluationParams.g.cs
@@ -50,6 +50,6 @@ static partial class EvaluationParams
     /// <summary>
     /// <see cref="Utils.Pack(1, 2)"/>
     /// </summary>
-    public const int QueenAttackedByKnightBonus = 131073;
+    public const int KnightAttacksRooksBonus = 131073;
 
 }
diff --git a/src/Lynx/Model/Position.cs b/src/Lynx/Model/Position.cs
@@ -733,11 +733,9 @@ private int KnightAdditionalEvaluation(int squareIndex, int pieceSide, int oppos
         var checks = (attacks & enemyKingCheckThreats).CountBits();
         packedBonus += CheckBonus[(int)Piece.N] * checks;
 
-        // Attacks to enemy queens
-        if ((attacks & PieceBitBoards[(int)Piece.q - Utils.PieceOffset(pieceSide)]) != 0)
-        {
-            packedBonus += KnightAttacksQueenBonus;
-        }
+        // Attacks to enemy rooks
+        var rookAttacksCount = (attacks & PieceBitBoards[(int)Piece.r - Utils.PieceOffset(pieceSide)]).CountBits();
+        packedBonus += KnightAttacksRooksBonus * rookAttacksCount;
 
         return packedBonus;
     }

diff --git a/src/Lynx/TunableEvalParameters.cs b/src/Lynx/TunableEvalParameters.cs
@@ -6044,7 +6044,7 @@ public static partial class EvaluationParams
     private static readonly int _PieceAttackedByPawnPenalty;
 
     [GeneratedPack(1, 2)]
-    private static readonly int _KnightAttacksQueenBonus;
+    private static readonly int _KnightAttacksRooksBonus;
 
 #pragma warning restore IDE0051, IDE0052, CS0169 // Remove unread private members