Chess problem: 5 days ago

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Bruno's Chess Problem: 06/28/2020

M.Velimirovic, 1st Pr., TT Pozarevac, 1994

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

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Archives of checkmates over the last 10 days can be consulted.

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1. Nd3! ... 2. Ra3#
  1... Na5, Nc5 2. Qc5#
  1... Qxb5 2. Nb2#
  1... Nd4 2. Nb6#
  1... Kxd5 2. Rb4#
  
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2020-06-28 10:45:32, by problemist
1st Place, Yugoslav Championship, 1994. FIDE Album.
2020-06-28 09:42:29, by problemist
The try key 1. Ne2? (threat 2. Rb2#) fails to 1.. Na5! The mates on 1.. Kxd5, Nd4, Qxb5, Nc5 2. Re3#, Qxd4#, Rxb5#, Nb6# are changed in the solution with the key 1. Nd3! to 2. Rb4#, Nb6#, Nb2#, Qxc5# (also on 1.. Na5). Both keys give the flight square d5. The variations on 1.. Nd4, Nc5 show the Bikos theme a reciprocal change of white capture and using the self-block on d4 and c5 respectively in try and solution.
The theme is named after the Greek composer Spyros Bikos (1911-1987): "In one phase, in one variation a self-block is exploited and in another variation the moving piece is captured. In another phase, the same two defenses have reciprocal continuation. For this theme a composition contest was organized in Holland, in 1948, having as judge the Hollander G. Seilberger." (Emmanuel Manolas)

Milan Velimirović (* 21.4.1952 in Niš, † 25.2.2013 in Belgrade) Serbian composer and Grandmaster in both chess composition and solving, see wikipedia de, en, fi, it, lv, sr. He was editor of Mat and Mat Plus. "Milan was also a renowned twomover composer and theoretician, who wrote many reference articles. He composed in other genres too (direct mates, selfmates). He was also the author, with Marjan Kovačević, of "2345 Chess Problems – Anthology of Chess Combinations" (1997)." With Kari Valtonen he published the "Encyclopedia of Chess Problems" (2012).
2020-06-28 09:13:58, by slowbut2
before my seeing others’ comments: My solution [arrived to through the 32-pixel, B&W, restartable-moving-pieces setting]: in view of the following possibility\s::::::::::::: black west knight moves southeast\ black king moves northeast\ ,,,,,,,,,,,,,,,,,,,,, it seems [ reverification is intended later on] that white's ndthree starts

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