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MatPlus.Net Forum General What does #C mean?
 
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(1) Posted by Andrew Buchanan [Tuesday, Feb 8, 2022 07:58]

What does #C mean?


Hi all,

I found "#C" in the stipulation of a recent Duellantenschach proof game.

I guess it means that a mating unit changes colour. Has the condition got a name?

WinChloe says:
After a mating move, the pieces threatening the King change colour, except if this change leads to a self-check = #Colour
c.f.
After a mating move, the pieces threatening the King disappear, except if these disappearances leads to a self-check = #Removal

Thanks,
Andrew
 
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(2) Posted by Geoff Foster [Wednesday, Feb 9, 2022 00:36]

#C (#Colour) is a form of PAM (Play after Mate): after a checkmate, the colour of the mating piece(s) is changed and the game resumes if a legal position results. The condition was first introduced by Andrey Frolkin and Chris Tylor in feenschach no.212 (2015). You can find examples of proof games with the #C condition in an article by Paul Raican entitled ‘Proof Games #color’ in Quartz 48, Nov. 2019, p.807.
 
 
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(3) Posted by Andrew Buchanan [Wednesday, Feb 9, 2022 17:08]

Thanks Geoff.

I believe that I invented what you problemists now call #R in the 1970s when playing Subbuteo tabletop football with my brothers :-)

See https://www.subbuteo.com/

Any token which scored a goal was removed from play. The winner of the match was the first to lose all 10 non-goalie tokens. This was a very effective handicapping mechanism for older siblings. There was also what you problemists might term a "Rex Inclusiv" form, where the goalkeeper was also a necessary object of self-removal in order to declare victory. I thought this variant was long forgotten, but I guess my brothers must have talked.

#C would have been more difficult because we only had 11 tokens for each team.
 
   
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(4) Posted by seetharaman kalyan [Friday, Feb 11, 2022 18:20]

Funny post from one Mr.Andrew? Is he a Problemist?
 
   
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(5) Posted by Andrew Buchanan [Sunday, Feb 13, 2022 10:24]

Yes it's me :) I just thought the distant way of writing this was more comical :) Subbuteo is a great game "over the pitch", but I know very few Subbuteo compositions
 
   
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(6) Posted by seetharaman kalyan [Monday, Feb 14, 2022 18:36]

So, who are those "You Problemists" ??
 
   
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(7) Posted by Andrew Buchanan [Tuesday, Feb 15, 2022 03:13]

It's *us* including me Seetharaman. It was just an idiom of writing :-)
 
   
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(8) Posted by seetharaman kalyan [Tuesday, Feb 15, 2022 05:19]

:D
 
 
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MatPlus.Net Forum General What does #C mean?