Hoping author accepts this correction. Looks sound to me.
The master of the pawn promotion in full form! Great problem using the conditions nicely.
This is C+ WinChoe for a). For b) WinChloe thinks the last move Bxe7 (Be7 -> c1) is illegal.
No.818 is a simplified version of problem 11 in the latest Fairings. Here the idea is to first manoeuvre the…
No.817: Excellent economy, although the bPe5 is not needed in the real solution. The mates are very similar, with the…
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…