Get around an issue with touchmove events failing to fire if you remove the element the touch starts on. When you touch the piece you want to remove, it will be hidden and only actually get deleted when you end the touch. All other pieces deleted during this touch will be deleted normally.

ui/editor/src/chessground.js

@@ -44,11 +44,8 @@ function onMouseEvent(ctrl) {
       ) return;
       var key = ctrl.chessground.getKeyAtDomPos(util.eventPosition(e));
       if (!key) return;
-      var pieces = {};
       if (sel === 'trash') {
-        pieces[key] = false;
-        ctrl.chessground.setPieces(pieces);
-        ctrl.onChange();
+        deleteOrHidePiece(ctrl, key, e);
       } else {
         var existingPiece = ctrl.chessground.state.pieces[key];
         var piece = {};
@@ -61,14 +58,13 @@ function onMouseEvent(ctrl) {
             piece.color === existingPiece.color &&
             piece.role === existingPiece.role
         ) {
-          pieces[key] = false;
-          ctrl.chessground.setPieces(pieces);
-          ctrl.onChange();
+          deleteOrHidePiece(ctrl, key, e);
         } else if (e.type === 'mousedown' || e.type === 'touchstart' || key !== lastKey) {
+          var pieces = {};
           pieces[key] = piece;
-          ctrl.chessground.cancelMove();
           ctrl.chessground.setPieces(pieces);
           ctrl.onChange();
+          ctrl.chessground.cancelMove();
         }
       }
       lastKey = key;
@@ -90,6 +86,37 @@ function onMouseEvent(ctrl) {
   };
 }
 
+var firstDelete;
+
+function deleteOrHidePiece(ctrl, key, e) {
+  if (e.type === 'touchstart' || e.type === 'touchmove') {
+    if (!firstDelete) {
+      if (ctrl.chessground.state.pieces[key]) {
+        ctrl.chessground.cancelMove();
+        e.srcElement.style.display = 'none';
+      }
+
+      document.addEventListener('touchend', function() {
+        deletePiece(ctrl, key);
+        firstDelete = null;
+      }, {once: true});
+
+      firstDelete = key;
+    } else if (key !== firstDelete) {
+      deletePiece(ctrl, key);
+    }
+  } else {
+    deletePiece(ctrl, key);
+  }
+}
+
+function deletePiece(ctrl, key) {
+  var pieces = {};
+  pieces[key] = false;
+  ctrl.chessground.setPieces(pieces);
+  ctrl.onChange();
+}
+
 function makeConfig(ctrl) {
   return {
     fen: ctrl.cfg.fen,