diff --git a/src/ui/flutter/lib/mill/position.dart b/src/ui/flutter/lib/mill/position.dart
index ece7e740..97ba28f5 100644
--- a/src/ui/flutter/lib/mill/position.dart
+++ b/src/ui/flutter/lib/mill/position.dart
@@ -157,6 +157,8 @@ class Position {
 
   bool empty(int sq) => pieceOn(sq) == Piece.noPiece;
 
+  String sideToMove() => _sideToMove;
+
   void updateScore() {}
 
   void setSideToMove(String color) {
@@ -171,7 +173,7 @@ class Position {
     return selectPieceSQ(makeSquare(file, rank));
   }
 
-  bool putPiece(var pt, int sq) {
+  bool putPiece(int sq) {
     var index = squareToIndex[sq];
 
     if (sq == null) {
@@ -179,6 +181,8 @@ class Position {
       return false;
     }
 
+    String pt = _sideToMove;
+
     _grid[index] = pt;
     _board[sq] = pt;
 
diff --git a/src/ui/flutter/lib/routes/battle_page.dart b/src/ui/flutter/lib/routes/battle_page.dart
index e7d64eff..7e7916d9 100644
--- a/src/ui/flutter/lib/routes/battle_page.dart
+++ b/src/ui/flutter/lib/routes/battle_page.dart
@@ -73,7 +73,7 @@ class _BattlePageState extends State<BattlePage> {
     //position
     //flag++;
     //position.putPiece(flag % 2 == 0 ? '@' : 'O', index);
-    if (position.putPiece('@', indexToSquare[index]) == false) {
+    if (position.putPiece(indexToSquare[index]) == false) {
       return;
     }