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MatPlus.Net Forum General Diagonal corner-to-corner knight in a selfmate?
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(21) Posted by Hauke Reddmann [Tuesday, Aug 13, 2019 12:56]

@Juraj: Yes, that counts. (Although I'd prefer a direct march and
the motivation is a bit trivial.)
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(22) Posted by James Malcom [Tuesday, Aug 13, 2019 14:00]; edited by James Malcom [19-08-14]

Hey Hauke, I have created a direct march with a clear motivation!

WTM, #9

(= 8+7 )

It took a few trashy tries, but I eventually got it, legal AND dual-free, along with elagant simplicity.

Also, also, because this topic was originally about selfmates, I created a diagonal corner to corner selfmate. Although, there is a possibility of a dual by forcing the Black king to c8 if such a sequence can be find.

WTM, s#8

(= 11+9 )

EDIT: I've also managed to make this selfmate in which the selfmating side does a direct diagonal corner to corner march.

WTM, s#9

(= 9+8 )

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(23) Posted by Olaf Jenkner [Wednesday, Aug 14, 2019 23:48]

The first problem has a dual, the king does not have to go to the corner:
6. Kd7 Bg8 7. Se8 Bh7 8. Sxc7 ~ 9. Bd6#

Maybe somebody is interested in these problems, none of them appeared in any award.
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(24) Posted by James Malcom [Thursday, Aug 15, 2019 02:35]; edited by James Malcom [19-08-15]

Thanks for those nice problems Olaf!

I believe that this shall do for a correction to my problem. It's even two moves longer.

WTM, #11

(= 7+11 )

The fashion in which Black has two self-smothered knights reminds me of The Treysman Horse. See Tim Krabbe's article kn it here in Dutch (The Google pagetranslator thingy REALLY helps me out here):

Funnily enough, I only remembered it AFTER I had finished my correction.

EDIT: I just realized that, with few pawn rearrangements, I can turn my above #11 into a #12.

WTM, #12

(= 7+11 )

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(25) Posted by seetharaman kalyan [Sunday, Aug 18, 2019 03:48]

Why not give solutions also? Is it some sort of solving contest?
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(26) Posted by James Malcom [Sunday, Aug 18, 2019 04:49]; edited by James Malcom [19-08-18]

It's not a solving contest. And why give the solutions? That would merely ruin the fun of solving it! Besides, given the context of the discussion, the solutions should be obvious and the ideas not to hard to see.

But it doesn't hurt to help those in need. Is there a particular problem of mine that you really want to figure out, but you can't, and thus you want to see the solution?
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(27) Posted by seetharaman kalyan [Sunday, Aug 18, 2019 14:46]; edited by seetharaman kalyan [19-08-18]

I cant figure out if more than two moves !! Anyway it is your choice to give solutions or not. Everybody else seems to manage without solutions.
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(28) Posted by Joost de Heer [Sunday, Aug 18, 2019 15:17]

The WTM #11 is dualistic: 1. Ba7 Ba2 2. Kg2 Bb1 3. Kf3 Ba2 4. Ke2 Bb1 5. Kd2 Ba2 6. Sd3 c1~ 7. Kc1 Bb1 8. Kb1 Sc2 9. Se5 Sa3 10. Kc1 ~ 11. Sf7#
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(29) Posted by James Malcom [Sunday, Aug 18, 2019 20:49]; edited by James Malcom [19-08-18]

Dang Joost, you're good at finding duals. Since my #11 doesn't hold, then neither does my #12.

I'm running out of ideas on how to fix my idea. I'm adamant that this one should hold up. This is because the WN can't move without letting the BK out. Any release on White's hold of the BK immediately destroys the mate. The economy is even better if this ends up being dual-free.

WTM, #12
(= 6+8 )

Third time is the charm?

Using the knight as the piece today be captured is easy as it easily contained. The real challenge for me is to somehow make a direct corner-to-cormer King move to capture a rook, which has far more range, along with making it legal and dual-free.
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(30) Posted by Siegfried Hornecker [Sunday, Aug 18, 2019 21:50]

Cook? 1.Kg2 b5! 2.Ba7 Sb6!
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(31) Posted by James Malcom [Sunday, Aug 18, 2019 22:11]; edited by James Malcom [19-08-18]

Nope!-1. Ba7!

If 1... c6/5? 2. 2. Bb8 Nc7 3. Bxc7 ~ 4. Bd6 ~ 5. Bf8#.

If 1 .. b5? 2. Bc5 ~ 3. Bf8#.

So thus 1... Bh7.

Would you say that BNa8 is an unguarded guard?

Nice try though Siegfred! Some of my problems may contain duals (not counting shorter solutions as those are cooks) but I sure as heck make sure that my soluions work.
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(32) Posted by Joost de Heer [Sunday, Aug 18, 2019 23:15]

(= 6+8 )

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(33) Posted by James Malcom [Monday, Aug 19, 2019 00:24]; edited by James Malcom [19-08-19]

Nice #12 with a bishop, Joost. Although what my problems are going for is a direct corner to corner march.

Also, has anyone ever thought about a bishop going step by step from one corner to the other?

This is the most economical illegal position that I could come up with

WTM, #8

(= 10+18 )

A step-by-step non-diaganol corner to coener rook. Just for fun!

WTM, #7
(= 9+15 )

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(34) Posted by Siegfried Hornecker [Monday, Aug 19, 2019 04:30]; edited by Siegfried Hornecker [19-08-19]

Many years ago I did something similar in a study, but didn't manage to get it fully from corner to corner. But I wanted both kings to march, so I did what I could.

(= 14+12 )

White to move and win
First publication was in my book Weltenfern, 2013:
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(35) Posted by James Malcom [Tuesday, Aug 20, 2019 16:53]

Interestingly, Stockfish declares your position a draw, Siegfried.

Also, if you want to see something funny, to to yacpdb and input "Siegfried" into the key bar. There is actually some results.
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MatPlus.Net Forum General Diagonal corner-to-corner knight in a selfmate?