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MatPlus.Net Forum General King corner to corner march
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(1) Posted by Hauke Reddmann [Sunday, Nov 26, 2023 15:05]

King corner to corner march

I'm sure I've seen a corner-to-nearest-corner march even in a study.
I tried to show a diagonal march (Schwalbe 1987, K7/8/p6p/p1p4p/8/2N1B2B/P2PP2P/4k3)
but it was hopelessly kaput. Never tried a proper repair (the first attempt
was kaput as well; 9# is way beyond my PC, I estimate a week check time,
and I don't have Gustav).

Can someone check +sPe4 or even +sPe4 +sPe5 (minus 1 pawn tempo anywhere)
or get this nuisance correct otherwise?

Has a diagonal march ever been shown before? (Orthodox, of course.) Later I did one,
but the motivation is just wK racing against bP to get zugzwang, so not exactly
hold-your-breath material. (Lüneburg 1990, K7/6p1/7P/4N3/8/npp5/rkp5/bbn5)
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(2) Posted by Sarah Hornecker [Sunday, Nov 26, 2023 15:48]

I published an endgame study under a pseudonym you will appreciate many years ago where I showed such a march by both players.

S. B. Preuss, MatPlus, issue 35, 2009, study number 1353. White to move and win
(= 7+8 )

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(3) Posted by Dmitri Turevski [Sunday, Nov 26, 2023 17:37]
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(4) Posted by Marcos Roland [Sunday, Nov 26, 2023 22:22]

Also this:
A. Kraemer
Die Welt, 1953
(= 5+11 )

1.Kb2 Rf2+ 2.Kc3 Rf3+ 3.Kd4 Rf4+ 4.Ke5 Re4+ 5.Kf6 Re6+ 6.Kg7 Re7+ 7.Kh8
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(5) Posted by Hauke Reddmann [Monday, Nov 27, 2023 09:24]

@Dmitri and Marcos: THX. There, the motivation obviously also is that the
standing place must be freed (for the mating piece - in my example for
to hide from a check) and that the king afterwards has to run for cover.
Quite a construction feat, but I like my motivation more (it's a bit
more hidden), so I'd *really* would like to see a correction of my
first attempt :-)
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(6) Posted by Joost de Heer [Monday, Nov 27, 2023 10:59]

Something like this? (and yes, I know there are two white-squared black bishops)
(= 6+8 )

(see for the complete thread)
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(7) Posted by Hauke Reddmann [Monday, Nov 27, 2023 17:53]

@Joost: Yeah, NOW I recall the thread, but I *still* like my motivation
somewhat better :-) (And I'd like to have it orthodox and diagonal.)
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(8) Posted by Frank Richter [Monday, Nov 27, 2023 20:46]

Hauke, your initial position from 1987 is even kaput in 8:
1.Bf4 Kf2 2.e4 Kf3 3.Le3 ~ 4.-7.e8Q,R,B and 8.#
With an additional bPe4 only 1.Kb7 solves, but with a lot of variations, most of them (possibly all) with duals.
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(9) Posted by James Malcom [Monday, Nov 27, 2023 21:30]

You'll find a few examples in these SuperProblem articles:

This one is fantastic:

Jacques Rotenberg & Jean-Marc Loustau, Phénix 1993-1994, #34
(= 11+11 )

This one is still my favorite study:

Karen Sumbatyan & Oleg V. Pervakov, Shakhmaty v SSSR 1990, White Wins
(= 12+10 )

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(10) Posted by Hauke Reddmann [Tuesday, Nov 28, 2023 10:34]

@Frank: Aw, bother. (And another Pe5 obviously doesn't work.)
So the strict diagonal march with nontrivial motivation
still is out of reach...

@James: Al-Suli already did one?!? Good grief, is there
anything new under the sun? :-) (Cool articles, BTW.)
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(11) Posted by Frank Richter [Friday, Dec 1, 2023 19:52]

I fear that the impressive concept of P1402334 is cooked.
Let's take the position after move 3:
1.Rb8 h3 2.Kg1 Bc5 3.Kf1 Bb6

(= 11+11 )

Now 4.f4! threatens that the wK goes up. If Black plays like in original solution, then follows
4.- Bc5 5.Kf2 Bb6 (5.- B:e3 6.K:e3 is hopeless) and now #12 according to Gustav: 6.Kf3 h4 7.f5 a5 8.Kf4 a4 9.Kf3 Bc5 10.Rb1 B:e3 11.K:e3 Sb6 12.Kf2 Sd7 13.S:d7 Kg8 14.Rg1+ Kf7 15.Rg7+ Ke8 16.h7 and 17.h8Q# with many variations (output is 380 pages ...).

So Black has to play 4.- B:e3 and therefore opens the b-line. Now 5.Rb4! (6.Re4 ~ 7.Re8#) Se7 (best move) 6.Re4 Bd4 7.R:d4 Sg8 (best move) 8.S:g8 K:g8 9.f5!! Sc8 (the King needs help) 10.Re4 Sb6 11.Re8+ Kh7 12.f6 Kg6 13.Rg8+ Kh7 14.f7 Sd7 15.Kf2 K:h6 16.Ke3 Kh7 17.Kf4 Kh6 18.Ke4 Sf8 19.Kf5 a5 20.R:f8 Kg7 21.Ke6 K:f8 22.Kf6 a4 23.e3 h4 24.e4 c6 25.d:c6 d5 26.c7 dxe4 27.c8=Q# (based on the analysis by The Huntsman 1 by Peter Martan)

I checked some other black moves with Gustav:
after 7.R:d4 Sf5 - #4: 8.Re4 S:h6 9.Re7 Sf7 10.R:f7 and #
after 8.S:g8 Kh7 - #11: 9.f5 Sc8 10.Re4 K:g8 11.f6 h4 12.Re8+ Kf7 13.h7 K:e8 14.h8=Q+ Kd7 15.f7 c5 16.f8=Q Kc7 17.Qd8+ Kb7 18.Qd7+ Kb6 19.Qd8# (first line of 300 pages output)
after 9.f5 Kh7 - #12: 10.f6 Sc6 11.f7 S:d4 12.f8=Q Kg6 13.Qg7+ Kf5 14.Q:d4 Kg6 15.Qg7+ Kf5 16.Qe7 Kf4 17.h7 Kg4 18.h8=Q Kf4 19.Qhf8+ Kg4 20.Qeg7+ Kh4 21.Qg3# (first line of 281 pages output)
after 9.f5 Kf7 - #13: 10.Rf4! Sc6 11.d:c6 Kf6 12.h7 Kg7 13.h8=Q+ K:h8 14.f6 Kg8 15.f7 Kf8 16.e4 h4 17.Rf2 a5 18.Rf6 a4 19.Kg1 d5 20.e:d5 Kg7 21.f8=Q+ Kh7 22.Rh6# (first line of 187 pages output)
after 10.Re4 Kf7 - #13: 11.Kf2 a5 12.Re8 K:e8 13.h7 Sb6 14.h8=Q+ Kd7 15.f6 S:d5 16.f7 Kc6 17.f8=Q Kb6 18.Qd7 a4 19.Qb8+ Kc5 20.Qb5+ Kd4 21.Qd3+ Kc5 22.Qb5# (first line of 419 pages output)
after 11.Re8 Kf7 - #12: 12.h7 K:e8 13.h8=Q+ Kd7 14.f6 S:d5 15.f7 Kc6 16.Kg1 Sf4 17.Qe8+ Kc5 18.f8=Q S:e2+ 19.Q:e2 Kb6 20.Qb8+ Kc6 21.Qc4+ Kd7 22.Q:c7 Ke8 23.Qf7# (first line of 361 pages output)
after 15.Kf2 Sf8 - #8: 16.R:f8 Kg6 17.Kg3 h4 18.Kf4 a5 19.Rg8+ K:f7 20.h7 c6 21.h8=Q c:d5 22.Rg7+ and 23.Qh6# (first line of 24 pages output)

I would ask authors and others to check this.

P.S.: 1.Kg2!? looks very dangerous too.
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MatPlus.Net Forum General King corner to corner march