private void processMoveToKingPile(MouseEvent e) {
        int index = (int) (e.getY() / (CARD_Y_GAP + CARD_HEIGHT));
        if (index < 4) {
            activeMove.cardReleased(index, CardMoveImpl.MOVE_TYPE_TO.TO_KING_PILES);
            String result = activeMove.makeMove(game, this);
            processMoveResult(result, activeMove);
        }
    }