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This item is a piececlopedia entry
It belongs to categories: Orthodox chess, 
It was last modified on: 2001-12-15
 Author: Fergus  Duniho. Pao. Moves like rook, but must jump when taking.[All Comments] [Add Comment or Rating]
Joost Brugh wrote on 2006-04-03 UTC
For two Camels, two Knights or a Wildebeest we can prove that the longest forced mate is one move, because the geometry allows only a few mating patterns. This two-move example with two cannons is not trivial. Is it possible to prove that two moves is the maximum. Known is that the mating patterns is always with the Black King on the side (X1), White's King on X3 or on b3 against when X = a. And White's cannons are at Y1 and Z1 with Y between X and Z and Y not adjacent to Z. The last move is a vertical move by a cannon (C YA-Y1 or C ZA-Z1). Blacks last move is a horizontal King move, which can only be forced if the end file is involved (Second rank squares can only be covered by the White King), so this must be Ka1-b1, which means that X = b. One retromove by a cannon later, c1 must be covered. This is impossible. With two (Cannon + passive Bishop)-pieces (passive Bishop is a Bishop that does not capture), it should work (from: White CmB on c4 and c5, White King King b3, Black King b1, Black to move) 1. ...,Kb1-a1 2. CmB c4-f1, Ka1-b1 3. CmB c5-g1#. Probably (not certainly, it should be possible to force this with two CmB's and a King against a lone King. It would be interesting to prove this (and of course the King+Cannon+Knight against King)