public short computeScore() {
		FieldModel f;
		short score = 0;
		for(int y=0; y < board.getSize(); y++)
			for(int x=0; x < board.getSize(); x++) {
				f = board.getField(x, y);
				if(f.isFlagged() && f.isBomb())
					score++;
				else if(f.isFlagged())
					score -= 2;
			}
		return score;
	}