Let me add my 2 cents. There are two different approaches in "classic" retro problems. The first one is "hidden…
White king is under check. Pd7 is the first piece that may defend
And "classic" twins of type b) npc7->b7 c) nPc7->d7 are also possible.
Still imbalanced in another way, but... White : Ka4 Pc6c5 Black : Ka6 Sd5a2 Pa7f5b3h3 MOg6 Zd8 Neutral : Pc7h2…
In the light of current discussion, I can propose the following version. White : Ka4 Pc6c5 Black : Ka6 Sd5a2…
1. Generally, considered OK. 2. OK, if the block is active. And the pin of black piece is OK even…
The experience of 9th WCCT and later tourneys generally shows that _all pieces must be necessary in all phase in…
It is more or less OK, as this piece makes mating move. I much more dislike WSd8 in first solution.
The below #7 is C+ with reasonable key, distorted symmetry and no dabbabas. The key was checked and 7 defences…
This may work. Still, even more symmetry and even longer computer check. I have put 8-mover with dabbabas on WinChloe…