The Retrograde Analysis Corner
A Mao is a Knight who does not jump over obstacles.
A Mao performs the usual (1,2) knight displacement but decomposes
it into first a 1-square rook move and then a 1-square
bishop move. If the intermediary square is occupied, the Mao is obstructed,
just like other non-leaping units may be.
In many ways, a Mao is not much different from a Knight. But on the
other hand, a Mao can give discovered checks, or pin enemy units. Note
that a Mao comeback uses different routes forward and backward.
The following triple (!!) check is legal:
(White Mao d4, Black Mao d3)
Here White is not in check. The triple check to the Black King is
explained by an en-passant capture. Last moves were -1. c5xd6
ep+++ d7-d5 -2. Mf3xd4++.
Maos are part of the Chinese chessmen family of fairy men
(invented by P. Seyfert in 1936) in which Queens, Rooks and Bishops
are replaced by Leos, Paos and Vaos. This is outside (for now) our RA-centered
scope. So let's rather admire a beautiful retro:
2nd Prize feenschach 1979
12+10. (Maos g1, e7) Both
sides may castle.
The game was played with Maos instead of Knights. (a)
Where have the Bishops been captured?
(b) Least number of moves by Mao b8?