Chess problem: 8 days ago

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Bruno's Chess Problem: 03/21/2017

M.Keller, 2eme Pr., Idee und Form (Thematic Tourney), 1986

Mate in 2(**)
chess problem diagram
White to play


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1. Rd2! ... 2. Rc7#
  1... Nf5 2. Qc3#
  1... Ne4 2. Qe3#
  1... Ne2 2. Bd6#
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2017-03-21 18:04:09, by problemist
Chlubna comments: "Dualvermeidungs-Zyklus des schwarzen Springers," "Sehr elegant," "In den drei Verführungen fehlt dem Weißen je einer seiner Mattzüge, so daß Schwarz in zyklischer Folge die beiden anderen ausschalten kann."
2017-03-21 17:47:06, by problemist
FIDE Album. Also quoted by David Shire in "The Problemist Supplement," July 2010, as an example for a white Herpai (Definition from the Encyclopedia of Chess Problems: "In defences Black opens two (or more) white lines seemingly allowing two or more mates. However, mates are separated by dual avoidance."): "[After the key] a random move by bNg3 opens two white lines to give an apparent choice of mates 2. Qc3, Qe3, Bd6. Compensating effects ensure that the arrival effects of the bN moves separate the triple. The exciting feature here is that these mates also determine the destination of the key rook!"
2017-03-21 10:12:49, by slowbut2
before my seeing comments: My solution: to rook mate\foresee defenses, white's rdtwo is start before mate with r\b\q\ \etc.
2017-03-21 06:10:10, by problemist
When the wRd7 leaves the 7th rank for the other wR the wNg3 has to move such that wRg7 is pinned. But not 1. Rd8?, Rd4?, Re3? Ne2!, Ne4!, Nf5!, so only the key remains. Reprinted as No. 2 in Chlubna's selection "Michael Keller - Ein Meister der Schachkomposition," 1994.

Michael Keller (*31.5.1949 in Remscheid) German composer and Grandmaster, see wikipedia de, it, lv, "is specialized in two- and threemovers.The Keller paradox is a direct mover theme that requests that "White moves to a square just controlled (or controlled again) by Black."

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