H. G. Muller wrote on Sat, Mar 3, 2018 04:56 PM UTC:
Yes, I can confirm that (from end-game tables). Champion can force mate only on boards up to 10x10.
Short-range leapers (i.e. up to distance 2) that cannot force mate without King help must in general lose their mating potential when the board is made sufficiently large. For pieces like WFDN it would not be a problem, and even WFvDvN could force mate on any size board. (But not on an infinite quarter plane, as it cannot catch up with a King running sideways.) But less powerful pieces cannot hinder the King enough to allow the other King to catch up with it.
Yes, I can confirm that (from end-game tables). Champion can force mate only on boards up to 10x10.
Short-range leapers (i.e. up to distance 2) that cannot force mate without King help must in general lose their mating potential when the board is made sufficiently large. For pieces like WFDN it would not be a problem, and even WFvDvN could force mate on any size board. (But not on an infinite quarter plane, as it cannot catch up with a King running sideways.) But less powerful pieces cannot hinder the King enough to allow the other King to catch up with it.