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| (1) Posted by James Malcom [Tuesday, Nov 26, 2019 07:40]; edited by 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 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 )
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| (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 ...
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| (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 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.
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| (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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