Juraj Brabec
1346 The Ural Problemist 24 - 2000
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1.PAe4? th. 2.Gxe3#,
1...Ge1, Ga3, Gxa5, Ge3xe5
2.Gd4#, LEh4#, PAgf5#, Bxe5#
1...Gc4!
1.PAd5? th. 2.Gxc5#,
1...Ge1, Ga3, Gxa5, Gc5xe5
2.LEh4#, Gd4#, PAxf2#, Bxe5#
1...Sd6!
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.
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