45... Nj5
Bulldog chess - Cat & Mouse - captaintugwash vs Fly-Eagles-Fly

Unfortunately, returning the knight to i7 was a blunder, you had to give up the pawn on h5. I suspect the mistake which caused this problem was Re7, it allowed my pawn to advance with tempo.
49. f7

Resign. Good game. I'm down a knight to a rook and two pawns, one of which is already a passed pawn, and very far away from my king... I liked the Cat and Mouse part a lot. Rematch?

Yes this is a lost cause for you, I simply advance the j-pawn.
Certainly I would be happy to play a rematch, would you be happy to tweak the cat to allow it to jump as a knight as well as its current ability? I think it will make it a much more active piece without it being too brutal in strength.
Also you will be white. I'll set up a thread later.
45. Rf1