Add tunable SEE piece values

lynx-chess · Nov 13, 2024 · dcb045a · dcb045a
1 parent c590b71
commit dcb045a
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Showing 3 changed files with 67 additions and 3 deletions.
diff --git a/src/Lynx/Configuration.cs b/src/Lynx/Configuration.cs
@@ -211,6 +211,21 @@ public int TranspositionTableSize
 
     [SPSA<int>(-8192, 0, 512)]
     public int HistoryPrunning_Margin { get; set; } = -1940;
+
+    [SPSA<int>(0, 1500, 50)]
+    public int SEE_Pawn { get; set; } = 100;
+
+    [SPSA<int>(0, 1500, 50)]
+    public int SEE_Knight { get; set; } = 450;
+
+    [SPSA<int>(0, 1500, 50)]
+    public int SEE_Bishop { get; set; } = 450;
+
+    [SPSA<int>(0, 1500, 50)]
+    public int SEE_Rook { get; set; } = 650;
+
+    [SPSA<int>(0, 1500, 50)]
+    public int SEE_Queen { get; set; } = 1250;
 }
 
 [JsonSourceGenerationOptions(

diff --git a/src/Lynx/SEE.cs b/src/Lynx/SEE.cs
@@ -10,10 +10,19 @@ public static class SEE
 {
     #pragma warning disable IDE0055 // Discard formatting in this region
 
-    private static ReadOnlySpan<int> _pieceValues =>
+    private static readonly int[] _pieceValues =
     [
-        100, 450, 450, 650, 1250, 0,
-        100, 450, 450, 650, 1250, 0,
+        Configuration.EngineSettings.SEE_Pawn,
+        Configuration.EngineSettings.SEE_Knight,
+        Configuration.EngineSettings.SEE_Bishop,
+        Configuration.EngineSettings.SEE_Rook,
+        Configuration.EngineSettings.SEE_Queen,
+        0,
+        Configuration.EngineSettings.SEE_Pawn,
+        Configuration.EngineSettings.SEE_Knight,
+        Configuration.EngineSettings.SEE_Bishop,
+        Configuration.EngineSettings.SEE_Rook,
+        Configuration.EngineSettings.SEE_Queen,
         0
     ];
 

diff --git a/src/Lynx/UCIHandler.cs b/src/Lynx/UCIHandler.cs
@@ -525,6 +525,46 @@ private void HandleSetOption(ReadOnlySpan<char> command)
                     }
                     break;
                 }
+            case "see_pawn":
+                {
+                    if (length > 4 && int.TryParse(command[commandItems[4]], out var value))
+                    {
+                        Configuration.EngineSettings.SEE_Pawn = value;
+                    }
+                    break;
+                }
+            case "see_knight":
+                {
+                    if (length > 4 && int.TryParse(command[commandItems[4]], out var value))
+                    {
+                        Configuration.EngineSettings.SEE_Knight = value;
+                    }
+                    break;
+                }
+            case "see_bishop":
+                {
+                    if (length > 4 && int.TryParse(command[commandItems[4]], out var value))
+                    {
+                        Configuration.EngineSettings.SEE_Bishop = value;
+                    }
+                    break;
+                }
+            case "see_rook":
+                {
+                    if (length > 4 && int.TryParse(command[commandItems[4]], out var value))
+                    {
+                        Configuration.EngineSettings.SEE_Rook = value;
+                    }
+                    break;
+                }
+            case "see_queen":
+                {
+                    if (length > 4 && int.TryParse(command[commandItems[4]], out var value))
+                    {
+                        Configuration.EngineSettings.SEE_Queen = value;
+                    }
+                    break;
+                }
 
             #endregion