lib/chess/chess_board.dart

@@ -22,8 +22,9 @@ class ChessBoard extends StatelessWidget {
       final piece = boardState.position[ChessCoordinate(column, row)];
 
       bool squareWasPartOfLastMove = false;
-      if (boardState.lastMove.to == ChessCoordinate(column, row) ||
-          boardState.lastMove.from == ChessCoordinate(column, row)) {
+      if ((boardState.lastMove.to == ChessCoordinate(column, row) ||
+              boardState.lastMove.from == ChessCoordinate(column, row)) &&
+          boardState.positionAckd) {
         squareWasPartOfLastMove = true;
       }
 

lib/chess_bloc/chess_bloc.dart

@@ -43,6 +43,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
         ChessColor.white,
         ChessPositionManager.getInstance().currentPosition,
         ChessMove.none(),
+        false,
       ),
     );
   }
@@ -56,6 +57,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
         state.newTurnColor,
         state.position,
         ChessMove.none(),
+        false,
       ),
     );
   }
@@ -76,6 +78,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
         turnColor,
         event.position,
         ChessMove(from: event.startSquare, to: event.endSquare),
+        true,
       ),
     );
   }
@@ -101,12 +104,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
     tempPosition[move.from] = const ChessPiece.none();
 
     emit(
-      ChessBoardState(
-        state.bottomColor,
-        turnColor,
-        tempPosition,
-        move
-      ),
+      ChessBoardState(state.bottomColor, turnColor, tempPosition, move, false),
     );
   }
 
@@ -131,7 +129,7 @@ class ChessBloc extends Bloc<ChessEvent, ChessBoardState> {
       InvalidMovePlayed event, Emitter<ChessBoardState> emit) {
     emit(
       ChessBoardState(state.bottomColor, turnColor,
-          ChessPositionManager.getInstance().currentPosition, ChessMove.none()),
+          ChessPositionManager.getInstance().currentPosition, ChessMove.none(), false),
     );
   }
 }
@@ -141,17 +139,19 @@ class ChessBoardState {
   final ChessColor newTurnColor;
   final ChessPosition position;
   final ChessMove lastMove;
+  final bool positionAckd;
 
   ChessBoardState._(
-      this.bottomColor, this.newTurnColor, this.position, this.lastMove);
+      this.bottomColor, this.newTurnColor, this.position, this.lastMove, this.positionAckd);
 
   factory ChessBoardState(
     ChessColor bottomColor,
     ChessColor turnColor,
     ChessPosition position,
     ChessMove lastMove,
+    bool positionAckd,
   ) {
-    return ChessBoardState._(bottomColor, turnColor, position, lastMove);
+    return ChessBoardState._(bottomColor, turnColor, position, lastMove, positionAckd);
   }
 
   factory ChessBoardState.init() {
@@ -165,6 +165,7 @@ class ChessBoardState {
       turnColor,
       ChessPositionManager.getInstance().currentPosition,
       ChessMove.none(),
+      false,
     );
   }