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MatPlus.Net Forum General twomover : tries ?!
 
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(21) Posted by Hauke Reddmann [Monday, May 5, 2014 11:10]

@Arno: Very neat that there are no double refutations
(and BTW the matrix you stole from me I stole from
Sir Jeremy Morse, so rather credit him :-)

BTW, I also made a "21" (with the trick that e.p.
counts separate) but your position is far superior.

Hauke
 
   
(Read Only)pid=12061
(22) Posted by Jacques Rotenberg [Monday, May 5, 2014 12:57]

22!

(= 15+9 )
2#
 
   
(Read Only)pid=12062
(23) Posted by Jacques Rotenberg [Monday, May 5, 2014 13:09]

But the position of Arno has another positive aspect : all the pieces are "needed" for the actual play, it means that any piece you withdraw will make the problem incorrect. It is not the case here.
 
   
(Read Only)pid=12063
(24) Posted by Kevin Begley [Monday, May 5, 2014 17:18]; edited by Kevin Begley [14-05-06]

I managed more than 22, based upon the same matrix.
I'll post it later, if nobody does better (and Jacques doesn't find an equivalent).
I think much more may be possible, but it seems to become an exercise of proving retro legality.


edit: computer problems... don't hold me to 23, as i cannot verify now.
 
 
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(25) Posted by seetharaman kalyan [Tuesday, May 6, 2014 20:17]; edited by seetharaman kalyan [14-05-06]

@ Geir Sune Tallaksen Østmoe
<<<Oh, wait... with Nb1, 1.Nc3 would not even be a try, since Black also has 1...Rh6! >>>>

Sorry... I missed this simple defect !
 
   
(Read Only)pid=12065
(26) Posted by Hauke Reddmann [Wednesday, May 7, 2014 11:04]

(= 15+9 )

This, for the record (pun unintended) is the "unconditional" record
for different refutations (29) by Morse (#212 in his "Tasks&Records").
It will be interesting how high MPF gets with the additional and very
demanding condition "any move except the solution is a try" or even
"each try has a different refutation" condition.

Hauke
 
 
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MatPlus.Net Forum General twomover : tries ?!