Chess problem: 4 days ago

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Bruno's Chess Problem: 09/14/2019

F.Fleck, 4th Pr., Levelezesi Sakkhirado, 1985

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


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1. Nxa3! ... 2. Nb5#
  1... Bxf4 2. Qh8#
  1... Qxd3 2. Qa4#
  1... Qb4, Qa5, Qxf4 2. Nf3#
  1... Nxf4, Nxe1 2. Qxd5#
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2019-09-14 10:21:42, by slowbut2
before my seeing comments: My solution [arrived to through the 32-pixel, B&W, restartable-moving-pieces setting]: in view of the possibility\s: black queen moves north \ , to mate with queen after south-black-knight captures [or to mate with queen\ night\ pawn ], white's nathree starts
2019-09-14 08:42:09, by problemist
Something has to be found against 1.. axb2 opening the flight c3 for the bK. Not 1. Nd6? (threat 2. Nb5#) Bxd6! So the key takes this pawn by the wN again with the threat 2. Nb5#. The main variations are the three captures on f4 giving the flight e5 1.. Bxf4, Qxf4, Bxf4 when the capturing piece is self-pinned and the pin mates 2. Qh8#, Nf3#, Qxd5# follow. Further 1. Qb4(Qa5), Qxd3 (another self-pin), Nxe1 2. Nf3#, Qa4# (pin mate), Qxd5#. Threefold rendering of the black self-pin on f4 and also a good chess puzzle.

Ferenc Fleck (* 17.2.1908 in Budafok, † 25.2.1994 in Budapest) Hungarian composer, Honorary Master and FIDE Master, see wikipedia de, it, lv. The German article is to be recommended as it is particularly comprehensive and contains an extensive discussion of the Fleck theme and its variants. "Ferenc Fleck was Honorary Master in chess composition but also an international judge and left his name to the Fleck theme: "Separation of the threats (at least 3) by an equivalent number of black defences, and there is no dual after each defence" (source: Problemesis)." For more biographical details see also the Hungarian site
From Günter Büsing's 'Kalenderblatt' in 'Die Schwalbe', April 2008: "Mehrfache Drohungen sind in der Regel unerwünscht, doch anders ist es beim Fleck-Thema, wo es darum geht, dieselben durch schwarze Verteidigungszüge zu differenzieren. Wie weit dieses Spiel getrieben werden kann, zeigt die Aufgabe von [Petrus] Overkamp (Niederländisches JT, 1951–52, 2. Preis), in der [...] nicht weniger als sieben Drohungen [...] durch die schwarzen Züge eindeutig separiert werden [...] Den Erfinder dieses Vorwurfs, Ferenc Fleck (17.2.1908-25.2.1994), konnte der Schreiber 1987 bei einem Besuch des Münchner Problemkreises in Budapest noch persönlich kennenlernen."

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