XGID=--bcBbBBBB-C-B--a-a-bbb---:1:-1:1:63:0:0:3:0:10
Unlimited Games. How should Red play 63?
Red wants to slow down here as White has a perfectly timed 2-3 back game.
Therefore, White must be made to pay a toll to release a checker. This makes the best play 13/10, 13/7.
Other plays such as 13/4 or 13/7, 11/8 are OK but still small errors. The key here is to compromise White’s timing. Ergo, 13/10, 13/7.