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MatPlus.Net Forum Misc Perpetual Check
 
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(1) Posted by Hauke Reddmann [Saturday, Jan 19, 2008 19:08]

Perpetual Check


You surely already know that GM Unto Heinonen
has upped the ante for consecutive checks to 49.
(See Tim Krabbe's site.)

It has been proved mathematically that an infinite
series is impossible (somewhen on USENET, I started
the discussion) but it's easy to come up with
fairy pieces or conditions allowing that.

Let's try to collect at least a dozen. (I already
know five offhand :-) Bonus points if the perpetual
is forced!

Hauke
 
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(2) Posted by Siegfried Hornecker [Saturday, Jan 19, 2008 21:46]

Knightriders allow it easily. :-)
 
 
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(3) Posted by Hauke Reddmann [Tuesday, Jan 22, 2008 17:07]

Yeah, that was one of the five
(three others being lions, camels - Elkies' perpetual
cross check - and Circe). Madrasi I managed in
a few minutes, so it's not *completely* trivial :-)

(= 4+4 )

1.Rf1+ Ra6+ 2.Rf8+ Rh6+ etc.

Hey, is everybody still in winter sleep? :-)

Hauke
 
 
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MatPlus.Net Forum Misc Perpetual Check