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MatPlus.Net Forum Competitions Announcement of SCHACH Corona Tourney
 
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(1) Posted by Thomas Brand [Saturday, May 23, 2020 10:07]

Announcement of SCHACH Corona Tourney


German paper SCHACH announces a composition „Corona Tourney" (n#, h#, +-) on physical distancing on board. Closing date is July 10, 2020; the award will be published in the October 2020 issue. Director is Thomas Brand, judge is Hans Gruber.

See detailed English announcement: http://www.zeitschriftschach.de/images/2020/corona-composition.pdf
German announcement: http://www.zeitschriftschach.de/images/2020/coronawettbewerb.pdf
 
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(2) Posted by Jakob Leck [Saturday, May 23, 2020 11:13]

A very nice initiative! And, although physical distancing is actually a quite serious matter, a funny idea to take the distancing to the chess board - mirror mates guaranteed.
 
 
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(3) Posted by Hauke Reddmann [Saturday, May 23, 2020 12:50]; edited by Hauke Reddmann [20-05-23]

Off a tangent (since this isn't included in the genres):

Shortest game (not necessarily SPG, but that would be cooler)
to a non-touching position? Can this one be beat
https://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P0005406%27
since a lot of pieces don't need capture?
 
   
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(4) Posted by Hannu Harkola [Saturday, May 23, 2020 15:52]

The correct English link is: http://www.zeitschriftschach.de/images/2020/corona-competition.pdf
 
 
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(5) Posted by Siegfried Hornecker [Saturday, May 23, 2020 19:51]; edited by Siegfried Hornecker [20-05-23]

Here's a joke:
(= 2+3 )

Helpmate in 4
Corona chess

Under normal rules, there would be many solutions. Under the Corona chess rules, only one: 1.Bf1 e6 2.Ke3 e7 3.Kd2 e8Q 4.Kc1 Qe1 mate (as in the mate move, the "physical distance" can be broken, but not earlier).
Of course, this is not what the tourney asks for. But could this become a new fairy chess variant, a sub-genre of Anti-Köko?
 
   
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(6) Posted by Geir Sune Tallaksen Østmoe [Saturday, May 23, 2020 20:18]

Are you allowed to defend against mate by breaking the distancing rules, though? 1.Rh4 e6 2.Kf2 e7 3.Kg1 e8Q 4.Rh3 Qe1#!?
 
 
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(7) Posted by François Labelle [Wednesday, May 27, 2020 21:01]

About Hauke's challenge, So far I found this:

(= 8+8 )

Non-unique PG in 13.0

Solution: 1.a3 a5 2.e4 h5 3.Qxh5 d5 4.Qxd5 f6 5.g4 Rxh2 6.Qxb7 Rxf2 7.Rh6 Qxd2+ 8.Sxd2 gxh6 9.Sc4 Rxc2 10.Qxc7 Rxc4 11.Qxe7+ Bxe7 12.Bxc4 Bxa3 13.bxa3 Sc6

I found this by computer. In 13.0 moves I also found games with 13,14,15 pieces left, but I suppose that the example above with 16 is more interesting. I found no unique PG in 13.0 moves. The search was not exhaustive, so there's nothing I can say about negative results (a unique PG in 13.0 moves might be possible, and a shorter game might be possible). I'll let my computer run longer and post an update if I find anything new.
 
   
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(8) Posted by Andrew Buchanan [Thursday, May 28, 2020 06:04]

The maximum number of pieces in a safe diagram is 16. Therefore there are at least 16 captures. In addition, there must be 8 moves to empty squares in ranks 3-6. Therefore the number of moves in a proof game (safe or otherwise) must be at least 12.0.
 
   
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(9) Posted by François Labelle [Friday, Jun 26, 2020 19:49]

I found an improvement:

(= 8+8 )

Non-unique PG in 12.5

Solution: 1.e3 a6 2.Bxa6 e5 3.Bxb7 Rxa2 4.Sa3 Rxb2 5.c3 Rxd2 6.g4 Rxf2 7.Qxd7+ Qxd7 8.Bxc8 Rxh2 9.Rxh2 Bxa3 10.Rxh7 c5 11.Rxg7 Sh6 12.Rxf7 Kxf7 13.Ba6

and a unique PG:

(= 6+5 )

PG in 13.5 (C+ Jacobi)

Solution: 1.e4 a6 2.Bxa6 Sh6 3.Bxb7 Rxa2 4.Bxc8 Rxb2 5.Bxd7+ Qxd7 6.g4 Qxd2+ 7.Qxd2 Rxc2 8.Qxh6 Rxf2 9.Qxg7 Rxh2 10.Rxh2 Bxg7 11.Rxh7 Bxa1 12.Rxf7 c6 13.Rxe7+ Kxe7 14.Sc3

Thanks Andrew for calculating the lower bound of 12.0 moves.
 
 
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MatPlus.Net Forum Competitions Announcement of SCHACH Corona Tourney