private Tile[] nakedPair(Board board) {
		boolean found = false;
		Tile[] pair = null;
		Tile tile;

		for(int y = 0; (y < BOARD_SIZE && !found); y++) {
			for(int x = 0; (x < BOARD_SIZE && !found); x++) {
				if(board.getTile(x,y).getValue() == 0) {
					if(board.getTile(x,y).getPossible().size() == 2) {
						if((tile = nakedPairAll(board, x, y)) != null) {
							pair = new Tile[]{board.getTile(x,y),tile};
							found = true;
						}
					}

				}

			}
		}
		return pair;
	}