3 recent fairy twomovers from The Ural Problemist

During the searches for suitable examples for 6th TT Chess Composition Microweb I browsed through recent issue of The Ural Problemist that contained a few problems with chinese pieces. Yes, I found some antibattery mates, but they by no means were the core of problems. I found them worth showing to the readers. First in single phase shows cute trial avoidance, second lives in tries and analogical variations of the solutions while the last shows complicated change theme.
Anatolij Vasilenko
1344 The Ural Problemist 24 - 2000

1.Nd8! th. 2.Nd4#
1...Nxf3 2.PAxb6# (2.Bf6??, 2.Rg6? Kh7!)
1...Ne4 2.Bf6# (2.Rg6? Kxg6!, 2.PAxb6? Nf6!)
1...Nxe6 2.Rg6# (2.PAxb6??, 2.Bf6? no check)

Very interesting trial avoidance with varied avoidance motivation.

#2 (9+7)
pao e6, a7, vao b1, f1, nightrider a2, d3, f3, g5

Petko A. Petkov
1345 The Ural Problemist 24 - 2000

1.PAd4? PAd5!
1.PAc4? PAc5!
1.PAb4? PAb5!

1.PAa4! th. 2.Be4#,
1...PAd4, PAc4, PAb4 2.Qd3#, Qc2#, Qb1#
(1...PAe4 (PAxe2), Sg4+ 2.Rg5#, Bg4#)

Duel pao vs. pao in tries, duel pao vs. queen in 3 main variations. In these paos on 8th rank are interfered by unlucky PAe4. Interesting idea calls for more complicated rendering.

#2 (12+9)
2+4 pao

Juraj Brabec
1346 The Ural Problemist 24 - 2000

1.PAe4? th. 2.Gxe3#,
1...Ge1, Ga3, Gxa5, Ge3xe5
2.Gd4#, LEh4#, PAgf5#, Bxe5#

1.PAd5? th. 2.Gxc5#,
1...Ge1, Ga3, Gxa5, Gc5xe5
2.LEh4#, Gd4#, PAxf2#, Bxe5#

1.PAd6! th. 2.Gxc7#,
1...Ge1, Ga3, Gxa5, Gc7xe5
2.PAgf5#, PAxf2#, Gd4#, Bxe5#

Z-34-65, but this short code says little about mechanism of this excellent twomover. So let's look at it more deeply. Try 1.PAe4? activates grasshopper lines on e-file, directly covers e6 and indirectly flight e5 (in set play provided by PAd4~#). Battery mate by Ge5 may be defended by 3 grasshopper defences: Ge1 opens Ge2 to e5 and thus allows Somov mate Gd4, Ga3 opens Ga5 to f5 and thus, as both e6 and f5 are well covered, allows LEh4# and Gxa5 unguards f4 allowing PAgf5#. Last variation is finished by the same mate after variaos defences, simply motivated (two captures), but it is integral part of scheme, not artificial addendum. Similar effects occur in two other phases, giving Z-33-34 (carousel change with the same mate on diagonal including 3 reciprocal changes, for the first time shown by duo Brabec&Lehen, another rendering in Circe see here) and added Z-31-31, together already mentioned Z-34-65.

#2 (16+9)
1+0 leo, 4+0 pao, 5+3 grasshopper

Comments to Juraj Lörinc.
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