The Olson problem was not published as an "ultra maxi" but as a "logical maxi", in which a check on…
Good that you found a 1951 Maxi Ultra problem. Our fairy chess problem world is best served by using the…
The following example is another good illustration of the fact that Popeye's definition of Max Ultra is not correct regarding…
In the first example above I see I omitted "cond" from the Popeye input for the twin.
There was an article of mine on the Maxi Ultra condition in the May 2012 Problemist in which I gave…
"But I hope, for WiCh, wKa8-b8+ bKc8-d7 is still relevant." True, thanks! This is my mistake - An important bPd7…
To summary, there are 3 kinds of black max, the difference being related to the possibility, for the black side,…
And again, about Ka8-b7, I forgot that White is not constrained. But I hope, for WiCh, wKa8-b8+ bKc8-d7 is still…
Of course, I missed that only Black is affected by the condition. So, the legality of bKc8-d7 is relevant for…
Nicolas wrote "The skeleton of the final mating position..." But the WiCh-legality depends on the block/attack of b7,d7,c7. As long…