private String makeBoardMove(CardGame game) {
        switch (moveTypeTo) {
            case TO_ACE_PILES:
                return game.moveCardOntoAceFromBoard(indexFrom, indexTo);

            case TO_KING_PILES:
                return game.moveCardOntoKingFromBoard(indexFrom, indexTo);

            case TO_HAND:
                return "Cannot move to hand.";

            case TO_DECK:
                return game.addToDeck(indexFrom);
        }
        return "ERROR";
    }