amitparikh·10 か月前·議論Right, and by "reachable" they mean it is theoretically possible to get to this board position through a normal (albeit obviously methodically chosen) series of moves.
amitparikh·2 年前·議論The "projection" can be centered on any arbitrary point, actually. See https://vanderbei.princeton.edu/planets_webgl/GottPlanets.ht...