Strat.AlgoImplements strategy algorithms on graphs
coherent_player g p returns true iff the completion p is coherent w.r.t. the graph g
coherent_strat g s returns true iff the strategy s is coherent w.r.t. the graph g
game g p a b returns true iff a wins in g given the completion p (i.e. the game goes through a final state).
strategy g p s returns true iff s wins in g given the completion p, whatever strategy plays the other player.