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MatPlus.Net Forum General Consecutive promotions when enforcing stalemate
 
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(1) Posted by Rewan Demontay (Real Name: James Malcom) [Tuesday, Nov 26, 2019 07:40]; edited by Rewan Demontay (Real Name: James Malcom) [19-11-26]

Consecutive promotions when enforcing stalemate


I recently found a nice problem by Mr. Kirtley: https://www.yacpdb.org/#92131

Mark Kirtley
U.S. Problem Bulletin, 1992
=8
(= 13+7 )



8 knight promotions in a row to enforce a stalemate is a record fulfilled of course. But what about for other promotions? I don't know of the right stipulation to search for over at Schwalbe (YACPBD didn't really give anything), so I decided to try to see how far I could go on my own.

=6
(= 8+6 )


This one shouldn't be cooked, and 6 rook promotions in a row was fairly easy.

=4-Cooked?
(= 9+5 )


Bishops promotions are harder, but I managed three in the main line.


=5-Definitely Cooked
(= 8+2 )


Queens are hard to control, so this is probably cooked. But if correct, 4 in a row is not bad.

What are the actual records though?
 
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(2) Posted by Olaf Jenkner [Tuesday, Nov 26, 2019 16:02]; edited by Olaf Jenkner [19-11-26]

The =6 is cooked by sudden stalemate in the 5th move:
1. a8=R+ Kb7 2. cxb8=R+ Kc7 3. dxc8=R+ Kd7 4. exd8=R+ Ke7 5. fxe8=B = !!

The =4 is cooked:
1. fxg8=R+ Kh7 2. Rxg7+ Kh8 3. Qxb7
or
1. fxg8=B+ Rf7 2. Qxe7 Sa5 3. Qb4

The =5 is cooked in 4 moves:
1. a8=Q+ Kb6 2. b8=Q+ Kb5 3. Qa4
 
 
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(3) Posted by Rewan Demontay (Real Name: James Malcom) [Tuesday, Nov 26, 2019 19:24]

Thanks Olaf.

7 rooks is easy enough with a couple of promoted knights.

=8
(= 10+8 )


A piece to capture should fix this.

=5
(= 8+3 )


The queen was too powrful of course. Replacing it should suffice.

=4
(= 10+5 )

 
   
(Read Only)pid=18369
(4) Posted by Olaf Jenkner [Tuesday, Nov 26, 2019 21:01]; edited by Olaf Jenkner [19-11-26]

7 rooks is not easy. The cook has only two rooks:
1. a8=R+ Kb7 2. cxb8=R+ Kc7 3. exd8=Q+ Kxd8 4. dxc8=Q+ Ke7 5. gxf8=Q+ Kxf8 6. fxe8=Q+ Kg7 7. Qg6+ Kh8 8. Sxh3=

The =5 has 6 solutions, for exampple
1. a8=R+ Kb6/Kxb7 2. exf8=Q ...

The =4 has 6 duals, for example
1. fxg8=B+ Rf7 2. Ba1 ...
 
   
(Read Only)pid=18370
(5) Posted by Michael McDowell [Tuesday, Nov 26, 2019 21:38]

James Malcom - Why do you not test positions before you post them? The software (Popeye, Fancy, Teddy) is all downloadable.
 
   
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(6) Posted by Rewan Demontay (Real Name: James Malcom) [Wednesday, Nov 27, 2019 00:13]

I know it exists, I'm just ill-knowing about how to use the stuff. I have downloaded Olive, but all I can ever get to is a sea of random files and folders.
 
   
(Read Only)pid=18372
(7) Posted by Michael McDowell [Wednesday, Nov 27, 2019 11:22]

Download Popeye and the Teddy front end. They come with instructions.
 
 
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MatPlus.Net Forum General Consecutive promotions when enforcing stalemate