Problème d'il y a 6 jours

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Bruno's Chess Problem: 03/10/2025

L.Makaronez, 1999

Mat en 3(**)
chess problem diagram

Les blancs jouent

Astuce :

La solution du problème de mat du jour est disponible à partir du lendemain.

1. Bg1! ... 2. Qxf4+ Ne4 3. Qxe4#
  1. ... d2 2. Qxf4+ Ne4 3. Qxe4#
     2. ... Kd3 3. Qd4#
  1. ... Qxe7 2. Qxf4+ Ne4 3. Qxe4#
     2. ... Kd5 3. Qd4#
  1. ... Nf5 2. Qxf4+ Nd4 3. Qxd4#
  1. ... Ne2 2. Qe4+ Nd4 3. Qxd4#
  1. ... Qh6 2. Nc6 ... 3. b6#
     2. ... Bxc6 3. bxc6#
     2. ... Ne4 3. Qxe4#
  1. ... Rg4 2. Qc6 ... 3. b6#
     2. ... Bxc6 3. bxc6#
  1. ... f5 2. c6 ... 3. b6#
     2. ... Bxc6 3. bxc6#

2025-10-04 19:55:10, by problemist: For those who are interested in which detail solutions are to be given in a solving tourney, see the rules of the WCSC, 8, a): "in direct mate problems: all moves in all variations of full length which defend against the threat, including the threat if it is of full length, except the last move of Black and the mating move (i.e. in twomovers only the key; in threemovers all three-move variations, including the full length threat, up to the second white move, etc.). If there is no threat at all or an existing threat of full length is not written, all variations of full length are to be given. In a moremover with a threat (at any point) Black may have a defence that leads to a variation with the same next move(s) as in that threat, but a different continuation for White before the mating move; this variation must be written."
So I guess that my solution would be sufficient as in Bruno's additional by-play 2. Qxf4+ from the threat is played, though the mating move may be different. And for 1.. Qh6 2. Nc6 Ne4 3. Qe4# the second White move suffices though mate is not delivered by 3. b6#.
2025-10-04 09:08:36, by problemist: Bruno shows further by-play in his solution. Maybe this was required in the solving competition and the challenge was not to miss any of these side variations.
2025-10-03 08:34:16, by problemist: "Is it not better to be in ignorance than to believe falsely?"
Robert A. Heinlein (1907-1988, under the pseudonym Anson MacDonald) "By His Bootstraps," 1941.

Published in "Troll" 1st Commendation (Judge Mirko Degenkolbe). A logical problem. The idea is to mate with the Ba6, but the immediate 1. b6+ Bb5! does not work yet, also the preparatory 1. c6?, Qc6?, Nc6? (2. b5#) work if Black captures on c6 (bad defenses) but fail to 1.. Rg5!, Bh5+!, Qxc5! The idea is to invalidate these defenses so that only the bad defenses are available ("Beugung" = deflection). Thus the foreplan 1. Bg1 (2. Qxf4+ Ne4 3. Qxe4#) f5, Rg4, Qh6 and now the mainplan 2. c6, Qc6, Nc6 threatening 3. b6# and on the captures on c6 follows 3. bxc6#. By-play 1.. Ne2 2. Qe4+. Posed in the "German Chess Solving Championship," Gera, 17.6.2023, so it should be challenging to solve. Reprinted in "Problemschach-Jahrbuch 1999" (2000).

Leonid Makaronez (* 22.6.1948) Ukrainian-Israeli composer and International Master. "Leonid Makaronez is a well-known direct mate composer. He seems to enjoy composing problems in collaboration, with Semion Shifrin, L. Lyubashevsky, Mikhail Marandyuk." He lived in Львів, Брянск, Haifa, Rishon LeZion.

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