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| (1) Posted by Eugene Rosner [Thursday, Feb 27, 2014 15:30] |
proof game question
Hi Everyone! I have been asked to judge the outstanding 2005-6 Problemist retros and I have started looking at the problems.Has anyone ever composed a shortest proof game(game score) where in the diagram (position after a certain move) the original 4 knights are standing on what appears to be their game array squares(starting positions) but all 4 knights have, in fact swapped places?
Has this been done with four rooks?
Hope you can help!
Eugene
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| (2) Posted by Joost de Heer [Thursday, Feb 27, 2014 16:03] |
Rooks was done by Unto Heinonen (P0008568). I don't know of a knight example.
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| (3) Posted by Eugene Rosner [Friday, Feb 28, 2014 19:54] |
many thanks Joost! Wonderful game score!!
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| (4) Posted by Dupont Nicolas [Sunday, Mar 2, 2014 23:20] |
Hello Eugene,
The task you mentionned (interchange of the two pairs of Knights) is one of my favourite open problem! A related problem, probably even more complicated, is the double interchange of the same (monocolored) pair of Knights. Paul Raican and I succeded, but in the Circe Cage setting, I'm not aware of another such rendition. I claim it is probably even more complicated as the corresponding problem with Rooks has not been fulfilled yet (to my best knowledge). There is an attempt (by Satoshi Hashimoto if I remember) where Ra1->h1->a1 and Rh1->a1->h1, but without a step where Ra1 stands on h1 and Rh1 stands on a1.
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| (5) Posted by Joost de Heer [Monday, Mar 3, 2014 21:51] |
The Hashimoto proofgame Nicolas refers to is P0009164.
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| (6) Posted by Eugene Rosner [Tuesday, Mar 4, 2014 02:26] |
boy, that's a lot of moves by the white rooks before they settle down and ultimate swap places!
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| (7) Posted by Joost de Heer [Tuesday, Mar 4, 2014 15:16] |
Another composition in which none of the rooks is original: P1000436
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| (8) Posted by Joose Norri [Wednesday, Mar 5, 2014 03:37] |
A similar theme is shown in P0005884.
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