Twin is missing. It seems b) Kb5 to h3
Congratulation Alexey for this nice achievement in the honour of the couple Rook/Bishop !
The Qg2 solution feels like a unique cook (different mate, repeated first move).
Nice echo mates.
In Umwandlungen in Märchenfiguren, the difference is under the diagram (Umwandlungen Nur and Umwndlungen Auch). I don't think there's a…
Dear Joost, thank you for the detailed explanation. With respect to the "first and second option", how does a solver…
The default is that one can promote to any non-royal piece present in the default set of the current condition…
A question about promotion to fairy pieces: If there is no Grasshopper in the initial position of a chess problem,…
Czech Republic is the official name, Czechia is used shortened name.
I don't know, if better, but I have different ones for Dawson Triathlon 🙂 Concerning Joost's version, it solves nicely…