It looks like all these complications could be avoided if series play was defined as a fairy condition that modifies…
One may argue that 1.a3? is not a stalemate at all under the series-help rule, where white can (and must)…
I think it is legal. According to most definitions, the aim of (ser-)hs= is not a stalemate position, but a…
(in 2) 1.d1=R 2.Rd3(or Rd5) Q×R# (via d1) But the white queen cannot move because of the check from bPg2,…
But we do not know that the bPg7 is the original bPg7! As the given position is not a result…
There are definitions for legal move and legal position, but what is exactly a legal piece? And why bPg7 is…
The theme now explicitly allows the capture of the pinner by the pinned piece.
Or it may be useful to consider that c8 belongs to the checking line. After all in Anti-Circe bishops don't…
In P0000424 the only missing white piece is wBf1. This means that 1) Last moves could not be dxe3/dxe5 2)…
Are the "rotational" twins (as intended in P0000424) really inferior compared to the twins where thematic pieces (here - both…