Problème d'il y a 6 jours

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Bruno's Chess Problem: 15/04/2018

F.Giegold, Schach Echo, 1967

Mat en 2(**)
chess problem diagram
Les blancs jouent

Astuce :

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Cacher la solution
1. Bg2! ... 2. Nf3#
  1... Bxd4 2. Bxd4#
  1... Bxg2 2. Nxe2#
  1... Kxg2 2. Rxg7#
  
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2018-04-16 06:36:20, by problemist
Thanks for the correction and your attentive review of the comments.
2018-04-15 19:24:57, by schmerl
There are no duals after a random move by bBg7.
2018-04-15 09:04:42, by problemist
The effective key is sort of a Novotny, but without any threat (as the wBg2 is not guarded) just creating zugzwang. If Black takes with B or R the Novotny mates 2. Nxe2#, Nf3# (also on 1.. PxB) follow. Both are possible on a random move of bBg7 while on 1.. BxN 2. BxB#. Finally 1.. KxN 2. RxB#. A nice chess puzzle that may also appeal to the otb-player as the most problem-like (and least otb-like) move solves.

Fritz Emil Giegold (*2.3.1903 in Leupoldsgrün, +13.11.1978 in Leupoldsgrün) German composer, see wikipedia de. "Leupoldsgrün. That's the place. It became world-famous, at least in the problemists' world, because of one person: Fritz Emil Giegold. His enigmatic, difficult but facetious and ravishing longmovers fascinated and amused solvers of many chess magazines and newspaper columns and owed him the nickname of 'Rätselonkel' (Puzzle Uncle). His specialty consisted in forced black play, but very hidden and counter-intuitive white moves.

Fritz Giegold published his first problem in 1916. He edited the chess column of the Frankenpost newspaper from 1948 until 1978 and also collaborated with other publications. He wrote one book with Walther Horwitz: "Zaubereien auf dem Schachbrett" (1962) and two anthologies were published after his death: Herbert Engel and Karl-D. Schulz's "Fritz Giegold - 200 problematische Einfälle und Ideen." (1982), and Herbert Engel's "Problemsammlung von Fritz Giegold" (1985) which is available online (today's problem is reprinted as No. 65)."
2018-04-15 08:19:03, by slowbut2
before my seeing comments: My easy-come solution: to mate with knight [or rook,bishop] after a move of black bishop [or another piece], white's bgtwo is start

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