# No.1257 (ND)

 No.1257 Nicolas Dupont (France) Оригинальные Retro & PG задачи JF – R2017-18

Определение: (показать/спрятать)

 No.1257 Nicolas Dupont France original – 03.12.2017 Solution: (click to show/hide) white Bf1c1 Ke1 Qd1 Ph2g2f2e2d2c2b2a2 Sg1b1 Rh1a1 black Bf8c8 Ke8 Qd8 Ph7g7f7e7d7c7b7a7 Sg8b8 Rh8a8 PG 17                                       (14+15) Black reflex # 1.h2-h4 Sg8-h6 2.h4-h5 Sh6-f5 3.h5-h6 g7*h6 4.c2-c4 Bf8-g7 5.c4-c5 Bg7-e5 6.c5-c6 Sf5-g7 { } 7.c6*b7 c7-c5 8.Rh1-h2 Sb8-c6 9.b7-b8=Q Bc8-a6 10.f2-f3 Ba6-d3 11.Ke1-f2 Bd3-g6 12.Kf2-e3 { } f7-f5 13.Ke3-d3 Ke8-f7 14.Kd3-c4 Kf7-f6 15.Kc4-b5 Kf6-g5 16.Kb5-a6 Be5*b8 17.Ka6-b7 Qd8-c8 +{dia (C+ by Jacobi, tested by the author)} As far as I know, this is the first example of a reflex proof game - if true it is therefore a new genre. Note that the condition Black reflex # might be generalized to White reflex and to Reflex when we sum up the 2 possibilities. It might also be generalized to almost any kind of goals (one for the black side and one for the white side, which could be different). Remark that 8.f3 can’t be played instead of 8.Rh2 because of the reflex 8…Bg3#. The move 10.f3 shows that the promoted piece on square b8 is a Bishop or a Queen, as the above diagonal checkmate possibility must be avoided. After 16.Ka6 there is a new orthogonal checkmate possibility 16…Qb6# if the promoted piece on square b8 is a Bishop. As this reflex checkmate is not played but replaced by the capture of the promotion, this latter is necessarily a Queen, and hence a Schnoebelen one as it didn’t move before its capture. This problem is Jacobi C+ according to the next version, to be available soon, which will introduce the possibility to check some new reflex genres. (Author)

### 1 комментарий: No.1257 (ND)

1. Juraj Lörinc пишет:

In PaM 101 (IX 2017), I have published in selections column (“Okienko do sveta”) a selection of various Schnoebelens, with emphasis put on Q-Schnoebelens (3 problems shown), naturally fairy ones. Two of them were by Nicolas :), one using KoBul kings, the other using Back-to-Back.

Well done here too…