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If it is modal then the play() method would not return until the dialog exited.

Can the human's interface be made modal?

Is the problem that the play() method for the human returns before the human has made his play? If the human's play was controlled by a modal dialog that didn't return until the human made his play,...

Where in the program is the code for that?

Where is the logic that controls the order of plays that you are having problems with?

Where is the logic that controls the order of plays that you are having problems with?