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| (1) Posted by Hauke Reddmann [Tuesday, Jun 4, 2024 10:59] |
Letters (Jurmala made me do it :-)
I daresay for any letter problem you need at least two black moves.
(Otherwise you maximally have the theme of "changed mate".)
Let's also assume that a set, a try and a real phase exists.
(Everything less would be a subset of the following.)
We thus have maximally six possible mating moves UVWXYZ to fill in,
plus - for not relevant and ! if A/B defends.
AB
SUV
TWX
RYZ
I have not computed how many letter themes this will make,
are you sure you already showed each and every of them?
Even only the interesting and the "non-split"? :-)
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| (2) Posted by Joost de Heer [Tuesday, Jun 4, 2024 12:44] |
QUOTE
I daresay for any letter problem you need at least two black moves.
Not really: Key, threat, one variation.
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| (3) Posted by Hauke Reddmann [Tuesday, Jun 4, 2024 17:22] |
So what do you intend to show with only one black move?
Regardless how you permute -!UVW, I don't see anything
else than a changed mate - what do I overlook?
(Unless, of course, you count the threat to the letters,
indeed then there already are 9 entries, 6w, 3b.)
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| (4) Posted by seetharaman kalyan [Wednesday, Jun 5, 2024 19:15] |
Letter H# problems. Is it ok to have one solution?
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| (5) Posted by Joost de Heer [Thursday, Jun 6, 2024 09:17] |
QUOTE
So what do you intend to show with only one black move?
Djurasevic cycle, Ceriani Cycle (and a Reeves cycle doesn't even require a black move, it's a cycle between key and threat).
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| (6) Posted by Hauke Reddmann [Thursday, Jun 6, 2024 09:59] |
Guess I have to buy "Cyclone" somewhen after all :-)
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| (7) Posted by Juraj Lörinc [Thursday, Jun 6, 2024 21:34] |
It is not only about Cyclone.
Juraj Brabec has included in his recent book "Za vsetkym hladaj motiv" the analysis of various non-isomorphic types of Z-xy-zt types. There is just one change of type Z-32-26 (change of 2 mates in three phases), but there are e.g. 26 non-isomorphic changes of type Z-32-44, one of them with phase variations aAbB-aCcB-aDdC, other like aAbB-aBbA-cCdD (with clean radical change in one phase).
In spite of extended formalism (allowing classification of change themes) he underlines throughout the book the following: formal themes can be interesting, but the key interest lies in the underlying motivation.
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