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MatPlus.Net Forum General Zugzwang in the mating move
 
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(1) Posted by Hauke Reddmann [Monday, May 24, 2021 12:53]

Zugzwang in the mating move


(= 4+2 )

=2 v
1.Bxb7+ Ka7 2.? (White zugzwang)
1.cxb7+ Ka7 (same? no:) 2.b8R!

As you see, White can be in zugzwang in the last move if the
stipulation is stalemate.
Obviously, this can only work in a direct mate if
somehow Black is in check and not in check at the
same time, depending who has the right to move.
(I'm fairly sure a respective fairy condition exists.)

Can you think of yet other situations of zugzwang in
the last move?
 
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(2) Posted by Nikola Predrag [Monday, May 24, 2021 15:16]

TransmutedKings + Lortap, for instance. See https://juliasfairies.com/problems/page-19/#No.50 by Peter Harris, twin b).

A simpler illustration shows the side having the move must be in check while the opponent must not be in check, obviously.
W:Kc5,Be3; B:Kg5,Be7
(= 2+2 )
TransmutedKings + Lortap
 
 
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(3) Posted by Jakob Leck [Monday, May 24, 2021 16:53]

"Zugzwang in the last move" shouldn't be that uncommon (?), e.g. in helpmates with tempo tries like https://pdb.dieschwalbe.de/P0533810 with the try 1.Kf8? f5 2.Kg7 Ke7 3.??, or in selfmates where the mating move by black is forced via zugzwang. But maybe you are looking for something more specific?
 
   
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(4) Posted by Hauke Reddmann [Tuesday, May 25, 2021 10:06]

@Jakob: No, nothing specific, just fishing for ideas. :-)
BTW, the helpmate has zugzwang in the last move *pair*.
Should have said ply or halfmove?
Neither the selfmate "counts" in my sense that in that
example the stipulation is fulfilled in the solution by
zugzwang, not averted in the try.
 
 
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MatPlus.Net Forum General Zugzwang in the mating move