Stephen Emmerson (U.K.)


Original Retro & PG problems
JF – R2017-18

Definition: (click to show/hide)

No.1226 Stephen Emmerson

original – 15.06.2017

Solution: (click to show/hide)

white Bf1c1 Ke1 Qd1 Ph2g2f2e2d2c2b2a2 Sg1b1 Rh1a1 black Bf8c8 Ke8 Qd8 Ph7g7f7e7d7c7b7a7 Sg8b8 Rh8a8

PG 6.5                                   (13+13)
Royal Dynasty

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June 16, 2017 17:47

My head went into circles at first, but later saw Stephen’s clever manouvre. White by 5.e:f8=K parries the check(because there are 2 WK’s) and checks Black.
Black similarly parries the check by d:c1=K. Rest is easy to follow.
Now it is upto experts to say if Schnoebelen Kings
has been done before?

June 16, 2017 22:09

Very nice. I suppose the Schnoebelen Kings will be possible ony with this fairy condition. Excellent use of the condition.

Stephen Emmerson
Stephen Emmerson
June 17, 2017 00:09

Bernd Gräfrath has shown a Schnoebelen King before in my column (The Problemist, Nov. 2014; solution May 2015) using Losing Chess. I might hope (but don’t know) if mine is the first instance of 2 such kings, but the condition makes it quite easy.

June 17, 2017 00:48

Problem 760 was an attempt to show 4 Schnoebelen Kings.

Stephen Emmerson
Stephen Emmerson
June 17, 2017 01:10

Ah well! It looks like you achieved two at least (Popeye [4.63,4.77] confirms it sound if after 9.5 moves in your sequence Black plays 10…Rxg8). I identified some improvements to the optimisation in Popeye which helped me test this problem; I’ll have a look to see what can be done in Extinction chess. Were the bugs you discovered just in PGs, as far as you can tell?

June 17, 2017 01:55

What I remember is that in version 4.69 I discovered several bugs (not only in Extinction chess, nor PGs) even with correct problems for version 4.63. I reported this fact to Thomas, who fixed it for version 4.75.

Concerning pb 760 I tried to make it sound after Joost’s cook, but failed… Would be great if you could succeed!

June 17, 2017 07:17

Kindly, Dupont, can you show me the pb 760?

June 17, 2017 08:37
Reply to  Ganapathi
June 17, 2017 09:05

Grafath’s problem also has an interesting motive for King promotion, perhaps more subtle than Extinction chess or Royal Dynasty.
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P.G.9.5 Losing Chess

1.a3 b5 2.c4 b5*c4 3.Qb3 c4*b3 4.Ra2 b3*a2 5.d3 a2*b1=K 6.Bh6 g7*h6 7.b4 h5 8.Sg1-f3 Sh6 9.Sd2 h4 10.Sd2*b1 dia

Joost de Heer
Joost de Heer
June 19, 2017 23:52

The earliest King-Schnoebelen is probably'P1084841

June 21, 2017 17:24

There’s a brilliant double king Ceriani-Frolkin by Michel Caillaud: P1068520. I’m fairly certain Michel published a correction, but I can’t find it at the moment.

Geoff Foster
Geoff Foster
June 22, 2017 02:13

Correction was published p.151, Probleemblad (IX 2011).

Michel Caillaud
1 Place, Nunspeet TT 2005 (v)
PG 29.0
Losing Chess

1.c4 f5 2.g4 fxg4 3.Qc2 h5 4.e4 h4 5.Se2 Rh5 6.Sec3 Rb5 7.cxb5 e5 8.Bc4 Se7 9.Ke2 Sg6 10.Re1 Ke7 11.h3 gxh3 12.Kd3 h2 13.Re2 h1=K 14.a4 Kh2 15.Ra3 Kh3 16.Rb3 Kg4 17.Rb4 h3 18.Bb3 h2 19.Kc4 h1=K 20.Re1 Kh2 21.Se2 Kg5 22.Sbc3 Kgf6 23.Qb1 Kfe6 24.Qa1 Kd5 25.exd5 Kh3 26.Se4 Kg4 27.Sg1 Kf4 28.Sc5 Ke3 29.fxe3 Ke8