Fairy chess composition
 No.1232 Nicolas Dupont (France) Original Retro & PG problems JF – R2017-18

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 No.1232 Nicolas Dupont France original – 24.06.2017 Solution: (click to show/hide) neutral Ia8c8d8e8f8h8a7b7c7d7e7f7g7h7a1b1c1d1e1f1g1h1a2b2c2f2g2h2 PG 6.5                       (0+0+28)  (C-) Checkmate position Undefined pieces Disparate {no animation for Undefined pieces (JV)} 1.d2-d4 Sb8-c6 2.d4-d5 Sc6-d4 3.d5-d6 Sd4*e2 4.Ke1*e2 Sg8-f6 5.d6*e7 Ke8*e7 6.Qd1-e1 Sf6-e8 7.Ke2-d1 # Symmetric at-home diagram, interchange (Qd1,Ke1), specific mate. Note that the purpose of the 2 waiting moves 4… Sf6 and 6… Se8 is not only to get a nice diagram, but more importantly to avoid any move from the black Queen. Indeed with square e8 free, 7…Qe8 is parrying the check! The stipulation is close to the Quartz TT10 but it is necessary to present this problem after the mating move (and not before) as this move is not unique. The problem is C+ (Popeye 4.77) when the piece types are defined, but it remains C? in full. (Author) No.1232.1 Nicolas Dupont France version of No.1232 – 15.09.2017 Solution: (click to show/hide) neutral Ia8d8e8f8g8h8a7b7c7d7f7g7h7a1c1d1e1f1g1a2b2c2d2e2f2g2h2 PG 7.0                       (0+0+27)  (C+?) Checkmate position Undefined pieces Disparate {no animation for Undefined pieces (JV)} 1.Sc3 d5 2.Sxd5 Bg4 3.Sxe7 Bxe2 4.Sf3 Kxe7 5.Rg1 Sd7 6.Kxe2 Qe8 7.Se1 Kd8 # The diagram position is less harmonious than in the cooked predecessor, but still “at-home”, and the remainder of the content is kept. The novelty is that this problem is correct, according to a non-official solving program by François Labelle! I also thank Paul Raican for valuable discussions. (Author)

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TheoGiakatis
June 25, 2017 13:37

Does the solver have to find the final image only? Or does he have to find the series of movements that lead to it? Is this series of moves unique?

Nikola Predrag
June 25, 2017 16:32

Stipulation asks for any legal play of 6.5 moves ending with mate, where any 28 white or black pieces occupy the 28 squares marked on the diagram.

The final image must be legally achievable, so a solver must provide any proper PG in 6.5 moves.
If there’s more than one PG, the problem is cooked (unless multi-solution was intended and indicated by the author).

TheoGiakatis
June 25, 2017 21:24

A solution can be: 1.d4 Nc6 2.e4 Nd4 3.Qd4 Nf6 4.e5 Ne4 5.e6 Nc3 6.Qg7 Nd1 7.ef7#.
However, it is easy to see that the same position can arise after a different order of these movements.

Nikola Predrag
June 25, 2017 23:15

I’m far from being an expert in that field but this looks as a cook-solution to me. Well found!

dupont
June 25, 2017 23:44

Yes this is a valid cook! François Labelle found almost the same one.

June 26, 2017 11:40

Why cook? The final position in the “cooked” solution is not mat. Any black pawn move is a sufficient defense.
By the way, PG in the author’s solution is correct (I do not mean a diagram with undefined pieces, only PG).

Joost
June 26, 2017 11:55

Since the last white move was a pawn move, black can’t make a pawn move.

June 26, 2017 12:04

Yes, you’re right. My hands were faster than my head.

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