fix: getFEN

server/src/chess/engine.ts

@@ -416,6 +416,8 @@ export default class Chess {
       emptySquares = 0;
     }
 
+    if (emptySquares) position += `${emptySquares}`;
+
     let castling = "";
 
     if (this._castling.w & MOVE_FLAGS.K_CASTLE) castling += "K";
@@ -423,6 +425,8 @@ export default class Chess {
     if (this._castling.b & MOVE_FLAGS.K_CASTLE) castling += "k";
     if (this._castling.b & MOVE_FLAGS.Q_CASTLE) castling += "q";
 
+    if (castling == "") castling = "-";
+
     return [
       position.substring(1), // remove first '/'
       this._turn,