After 58.Cx(6,7)+ Black's move is forced. This is where we are. If I'm mistaken please let me know.
58.Cx(6,7)+...K(7,10)
Chess on an Infinite Plane (gyrados06 - hitthepin)

Ok and I will demonstrate mate!
59.Q(6,11)+ K(8,10)
60.C(6,9)+ K(9,10)
61.Q(9,11)+ K(10,10)
6.Q(10,11)#
Good game

Great game between hitthepin and gyrados. Great tactics, and both players have great sportsmanship. Congratulations to gyrados for the win!

Yes, I'd like to play, but I will have to wait about a month before we start. I'm a little too busy currently. I have three players on my list: (1) Ry in bulldog with hunters (2) JohnHS in some bulldog game, then (3) gyrados in infinite chess. I'll send message to you in January and I hope you can still play at that time.
57.R(11,11)+...K(6,10)