bool function always seems to return true

Greetings, you may know me from my posting in the C Forums.

Having basic knowledge in Java, and thus a basic knowledge in Object Orientation, I decided to give C++ a go.

I decided to make a console-based tic-tac-toe game.

I'm having fun at it so far, but I have run up to a problem. I have a pointer to a Grid class (made by myself) called grid.

Whenever I call grid->isMoreMoves() , it seems to return true, as I am stuck in a loop dependent on it eventually becoming false.

I can't work out what I'm doing wrong? Any ideas?

Code:

//boxes (class field) is an array of 9 characters that represent each
//"box" of the grid.

//mark (class field) is an array of 2 characters" ( 'X' or 'O'), one for
 //each player.

//This function is contained in the public section of the class.
        bool isMoreMoves()
        {
            bool moreMoves = false;

            for ( int i = 0; i < 9; i++)
            {
                if ( (boxes[i] != mark[0]) || (boxes[i] != mark[1]) )
                {
                    moreMoves = true;
                }
                cout << boxes[i] << " "; //This line was to determine whether or not I was getting all values
            }
            cout << endl;

            return moreMoves;
        }

I'm testing out as only player 1, as I have not implemented switching players yet.

Oh man, I feel so stupid!

I just realized that I should have been &&'ing rather than ||'ing on line 14. *FACEPALM*