Compute subgame perfect equilibria (spe) in pygambit enumpure #523
Description
Reading gambit-enumpure there is a command line flag -P that can be passed to gambit-enumpure so that it only returns subgame perfect equilibria:
"By default, the program computes all pure-strategy Nash equilibria in an extensive game. This switch instructs the program to find only pure-strategy Nash equilibria which are subgame perfect. (This has no effect for strategic games, since there are no proper subgames of a strategic game.)"
I do not believe that parameter is part of the signature for the pygambit call: https://gambitproject.readthedocs.io/en/stable/api/pygambit.nash.enumpure_solve.html#pygambit.nash.enumpure_solve
If I'm not wrong (delighted if I am) would this be a good modification/contribution? With a pointer in the right direction I'd be happy to open a PR.