diff --git a/lib/board/pedax_board.dart b/lib/board/pedax_board.dart
index 65b01f1bc..2ee816137 100644
--- a/lib/board/pedax_board.dart
+++ b/lib/board/pedax_board.dart
@@ -212,9 +212,15 @@ class PedaxBoardState extends State<PedaxBoard> {
 
   int? _bestpathCount(final int color, final CountBestpathResultWithMove? countBestpathResultWithMove) {
     if (countBestpathResultWithMove == null) return null;
-    return countBestpathResultWithMove.countBestpathList.playerColor == color
-        ? countBestpathResultWithMove.countBestpathList.position.nPlayerBestpaths
-        : countBestpathResultWithMove.countBestpathList.position.nOpponentBestpaths;
+    final currentColor = context.select<BoardNotifier, int>((final notifier) => notifier.value.currentColor);
+    final isYourTurn = currentColor == color;
+
+    /// NOTE:
+    /// Why "when isYourTurn == true, show opponent value" ?
+    /// -> See: [CountBestpathResponse] class in lib/engine/api/count_bestpath.dart.
+    return isYourTurn
+        ? countBestpathResultWithMove.countBestpathList.position.nOpponentBestpaths
+        : countBestpathResultWithMove.countBestpathList.position.nPlayerBestpaths;
   }
 
   Color? _scoreColor({
diff --git a/lib/engine/api/count_bestpath.dart b/lib/engine/api/count_bestpath.dart
index 943e11e8e..1123aa285 100644
--- a/lib/engine/api/count_bestpath.dart
+++ b/lib/engine/api/count_bestpath.dart
@@ -32,6 +32,9 @@ class CountBestpathResponse implements ResponseSchema<CountBestpathRequest> {
   final CountBestpathRequest request;
   final String rootMove;
 
+  /// NOTE:
+  /// The color of the position in this result is the opposite of that in the request.
+  /// It's due to executeCountBestpath algorism and book/position structure.
   final CountBestpathResult countBestpathResult;
 }
 
@@ -53,20 +56,10 @@ Stream<CountBestpathResponse> executeCountBestpath(
     edax.edaxBookStopCountBestpath();
     final moves = request.movesAtRequest + move.moveString;
     final bookMoveListWithPosition = edax.edaxGetBookMoveWithPositionByMoves(moves);
-    final board = bookMoveListWithPosition.position.board;
-
-    final symetryMoveX = symetryMove(move.x, bookMoveListWithPosition.symetry);
-    final lastMoveSquarePlayer = edax.edaxBoardGetSquareColor(board, symetryMoveX);
-    int positionPlayerColor = -1; // empty.
-    if (lastMoveSquarePlayer == 0) {
-      positionPlayerColor = edax.edaxGetCurrentPlayer();
-    } else if (lastMoveSquarePlayer == 1) {
-      positionPlayerColor = edax.edaxGetOpponentPlayer();
-    }
 
     final result = edax.edaxBookCountBoardBestpath(
-      board,
-      playerColor: positionPlayerColor,
+      bookMoveListWithPosition.position.board,
+      playerColor: edax.edaxGetCurrentPlayer(),
       playerLowerLimit: request.playerLowerLimit,
       opponentLowerLimit: request.opponentLowerLimit,
     );