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MatPlus.Net Forum Promenade Evil spirits
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(1) Posted by Uri Avner [Saturday, Oct 21, 2006 16:03]; edited by Uri Avner [06-11-05]

Evil spirits

Andrey Selivanov's S#3 from the "Show me your problem" section reminds me of the following S#2 which keeps haunting me from its first day of appearance, yowling at me: "unfinished business, am I not?"
To translate this into a concrete question: can the idea be shown without the Zeroposition?
A "normal" twin should do the trick, not to speak of a simple try (or set) & solution.
Could anyone make the evil spirits go away?

Yochanan AFEK
Die Schwalbe 1982
3rd Prize
(= 10+10 )

a) +WPa4
b) +BPb5

1…Kxb6 2.Qc5+ Kxc5# (A)
1…Rxb6 2.Qb5+ Rxb5# (B)
1…axb6 2.Bxa6 b5# (C)
1…Kxb6 2.Qxb5+ Kxb5# (B)
1…Rxb6 2.Ba6 R~# (C)
1…axb6 2.Qc5+ bxc5# (A)

* Order of names above the diagram has been swapped by Administrator after the request by author of this post.
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(2) Posted by Miodrag Mladenović [Sunday, Oct 22, 2006 19:56]; edited by Miodrag Mladenović [06-10-22]

Hi Uri,

Because of the complexity of the scheme it's very hard to imagine that it's possible to find position without zero position. The best position that I found without zero positions is:

(= 9+9 )

a) diagram
b) -bPb5

a) 1.Ng7!
b) 1.Ndc3!

Of course this change a genre I am sure this is not what you expected but anyway I decided to reply. This may help somebody to come up with an ortodox version without zero position twin.

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(3) Posted by Ion Murarasu [Sunday, Oct 22, 2006 22:42]

Miodrag , in diagram position bPf7 is not necessary. In b) works bPb5->f7.
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(4) Posted by Uri Avner [Wednesday, Nov 1, 2006 00:39]

Hi Misha,
Thanks for trying. This, evidently, is not exactly what I had in mind, but it serves to show how close the orthodox position is to the possibility of a "regular" twin. Not much is needed, and yet...
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(5) Posted by Yochanan Afek [Thursday, Apr 12, 2007 23:21]

Sorry for the late response (I have just joined as a member): Another evil spirit should wonder: was it the original order of composers above the diagram? apparently not and not without a good reason.
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(6) Posted by Uri Avner [Friday, Apr 13, 2007 01:38]; edited by Uri Avner [07-04-13]

To shake off at least certain spirits, I have no problem to switch names.
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(7) Posted by Yochanan Afek [Tuesday, Apr 17, 2007 00:15]; edited by Yochanan Afek [07-05-04]

Matter settled
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MatPlus.Net Forum Promenade Evil spirits