🐛 Add support for negative wtime and btime (#556)

lynx-chess · Dec 31, 2023 · 12ece97 · 12ece97
1 parent 1b0da54
commit 12ece97
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Showing 2 changed files with 6 additions and 2 deletions.
diff --git a/src/Lynx/Engine.cs b/src/Lynx/Engine.cs
@@ -93,7 +93,7 @@ public async Task<SearchResult> BestMove(GoCommand goCommand)
             millisecondsIncrement = goCommand.BlackIncrement;
         }
 
-        if (millisecondsLeft > 0)
+        if (millisecondsLeft != 0)  // Cutechess sometimes sends negative wtime/btime
         {
             if (goCommand.MovesToGo == default)
             {

diff --git a/src/Lynx/UCI/Commands/GUI/GoCommand.cs b/src/Lynx/UCI/Commands/GUI/GoCommand.cs
@@ -49,7 +49,11 @@ public sealed partial class GoCommand : GUIBaseCommand
 {
     public const string Id = "go";
 
-    [GeneratedRegex(@"(?<wtime>(?<=wtime\s+)\d+)|(?<btime>(?<=btime\s+)\d+)|(?<winc>(?<=winc\s+)\d+)|(?<binc>(?<=binc\s+)\d+)|(?<movestogo>(?<=movestogo\s+)\d+)|(?<depth>(?<=depth\s+)\d+)|(?<movetime>(?<=movetime\s+)\d+)|(?<infinite>infinite)|(?<ponder>ponder)")]
+    /// <summary>
+    /// Note that wtime and btime need to support negative numbers because of cutechess
+    /// </summary>
+    /// <returns></returns>
+    [GeneratedRegex(@"(?<wtime>(?<=wtime\s+)-?\d+)|(?<btime>(?<=btime\s+)-?\d+)|(?<winc>(?<=winc\s+)\d+)|(?<binc>(?<=binc\s+)\d+)|(?<movestogo>(?<=movestogo\s+)\d+)|(?<depth>(?<=depth\s+)\d+)|(?<movetime>(?<=movetime\s+)\d+)|(?<infinite>infinite)|(?<ponder>ponder)")]
     private static partial Regex Regex();
 
     public int WhiteTime { get; }