private int checkOnePair(int player) {
		int[] hand = new int[players[player].cards.size()];
		int i = 0;
		for (int card : players[player].cards) {
			hand[i++] = card % 13;
		}
		
		for (int j = 0; j < hand.length; j++) {
			for (int k = 0; k < hand.length; k++) {
				
				if (j != k) {
					if (hand[j] == hand[k]) return hand[j];
				}
			}
		}
		return -1;
	}