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MatPlus.Net Forum Competitions Quick Composing TT-235 (#5-n, h#5-n, s#5-n) C. 31-12-2019
 
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(1) Posted by Aleksey Oganesjan [Wednesday, Nov 20, 2019 12:34]

Quick Composing TT-235 (#5-n, h#5-n, s#5-n) C. 31-12-2019


Editorial board of international web project "SuperProblem" (http://superproblem.ru/index-en.html) announces a quick composing New Year tourney for direct mates, help- and selfmates.

Awards will be published on the website http://superproblem.ru

View the announcement on the link http://superproblem.ru/htm/announcements/our_tourneys-2019.html#TT-235
 
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(2) Posted by Frank Richter [Wednesday, Nov 20, 2019 17:47]

One question: A capture by Black in the last move (mating move) of a s# is also not allowed?
 
 
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(3) Posted by Aleksey Oganesjan [Wednesday, Nov 20, 2019 19:22]

Yes, it's also not allowed.
 
   
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(4) Posted by Joost de Heer [Friday, Nov 22, 2019 07:01]

Castling is also a non-reversible move, but it is allowed?
 
   
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(5) Posted by Aleksey Oganesjan [Friday, Nov 22, 2019 08:35]; edited by Aleksey Oganesjan [19-11-22]

I waited for such question :)

As we know due to some problems (https://www.yacpdb.org/#424634, https://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P1087146%27), a castling is a reversible move - King and Rook can return on its initial squares! :))

But it is a joke, of course - a possibility of castling disappears after such "uncastling". And also this possibility disappears after "usual" reversible moves - as in Petrovic's masterpiece (https://www.yacpdb.org/#67373).

But I decided not to overload the conditions of this "light" New Year tourney by "bulky" formulations about rare cases. So yes, in this TT a castling is allowed.
 
   
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(6) Posted by Olaf Jenkner [Friday, Nov 22, 2019 09:23]

It is not recommended to use castling if you want to compose the longest problem.
 
   
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(7) Posted by Aleksey Oganesjan [Friday, Nov 22, 2019 12:17]

Why, Olaf?
 
   
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(8) Posted by Olaf Jenkner [Friday, Nov 22, 2019 12:46]

The number of possible positions is restricted. Most likely the winning position will not have king and rook on their inital squares.
 
   
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(9) Posted by Frank Richter [Friday, Nov 22, 2019 13:12]; edited by Frank Richter [19-11-22]

Most likely in all genres the best tablebase diggers and users of computer-aided composing will win, so I suggest to split the tourney at least in two sections .... positions with <= 8 pieces and compositions with > 8 pieces.
 
   
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(10) Posted by Aleksey Oganesjan [Friday, Nov 22, 2019 13:24]; edited by Aleksey Oganesjan [19-11-22]

It's interesting suggesting, Frank. I'll think about it.

But you must admit: if an author himself (without tablebases!) composed a long 8 (or less)-pieces-problem then he will be offended to be ranked as "digger" :)
 
   
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(11) Posted by Frank Richter [Friday, Nov 22, 2019 13:34]

We all are "diggers" ... so it would be no problem (at least for me).
 
   
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(12) Posted by Olaf Jenkner [Friday, Nov 22, 2019 18:12]

if an author himself (without tablebases!) composed a long 8 (or less)-pieces-problem then he will ... NOT WIN
 
 
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MatPlus.Net Forum Competitions Quick Composing TT-235 (#5-n, h#5-n, s#5-n) C. 31-12-2019