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Kevin Pacey wrote on Thu, Oct 15, 2020 05:59 AM UTC:

Long ago I asked H.G. about the ending of K + 2HW vs. K, HW being Horse-Wazir compound. His intuition was that the HWs should be able to force mate (say on 8x8).

Perhaps someone with an engine or database that can include lame leapers (such as the Horse [aka Mao]) might be able to tell if the following position that I came up with has a shorter solution than mate in 4 for White, which I doubt. Another point is that it would seem once the lone king is cornered, the win shouldn't take long, as a rule, for this type of ending:

https://www.chessvariants.com/piececlopedia.dir/mao.html

White to play and mate; one solution I have is:

1.HWd5-c3 check kb1-a1

(if 1...kb1-c1 2.HWe3-e3 mate)

2.HWe3-c2 check ka1-b1 3.HWc2-b2 check kb1-c1

(if 3...kb1-a1 4.HWb2-a2 mate)

4.HWc3-e2 mate.