chess change

chess_game/static/room.js

@@ -58,8 +58,13 @@
   }
 
   async function init() {
+    if (typeof Chess === 'undefined' || typeof Chessboard === 'undefined') {
+      console.error('Required libraries not loaded: Chess and/or Chessboard');
+      return;
+    }
     chess = new Chess();
-    board = Chessboard(boardEl, {
+    // chessboard.js prefers element id string in many setups
+    board = Chessboard('boardUI', {
       position: 'start', draggable: true, dropOffBoard: 'snapback',
       onDragStart, onDrop, onSnapEnd
     });