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Actually it wouldn't need to be that hard....
The players used in the last game, lets say the weekend game, U most
probably used your best team. For the traininggame U would want to use
the players that haven't been used in the weekend game. So by simply
excluding the last line up - Macattrick can pick the second string based on
that information and doesn't need 2 processing cycles.
Another way to solve the problem would be to attach categories to every
player. Then you could simply choose what category of players to use for
the next game and calculate the best line up from the chosen categories!

peter@nicolaidis.net