Unfortunately I cannot find a "simpler" presentation of the problem as with make&take+AntipodenCirceRI (see also my e-mail of June 5, 2020, and my article in feenschach # 242 "Auffälligkeiten, ...Schema G"). Basically, after a bicolour castling (Laue, make&take) the involved rook moves to the SAME position as in regular castling. The following "twin" seems to prove that PopEye correctly handles the general situation, but doesn't "know" the rook should be there (f8), as follows (in German notation):

in a) PopEye correctly finds the mate h#1, because after 1.f7-f6, and the following capture on e7 by a white bicolour castling move (resulting in legal rebirth of the sK on the FREE square a3), the then required Antipoden re-rebirth squares for the sK (e7, e6, f6) are all occupied, so no free rebirth square after the following second capture means mate. There is nothing the sK or any other black stone can do to prevent the following final capture with white's next move (by wBb3 or wTc1 under make&take) due to all occupied re-rebirth squares.

in b) an ADDITIONAL sHf5 (Heuschrecke) can move instead of the sK and "clear" the re-rebirth square (e7) for rebirth of the sK with the move 2.Hf5-g7×Se7-d7[-], so the following second capture of the sKa3 by wBb3 is no longer a problem, the Antipoden re-rebirth square e7 is now empty! PopEye correctly shows there is NO solution for h#1
(for a different move like 2.Hf5-d6×Se7-d7[-] see following).

in c) replacing sHf5 with sHe4 SHOULD completely change the whole situation! As square e6 is occupied by a sB, the H could - theoretically - only remove the wS with a move 2.sHe4-c5,d6×Se7-f8[-]. PopEye seems to WRONGLY execute this move and shows the same "no solution" as in b), BUT this move is impossible. So, there SHOULD be the same solution like in a), because f8 is actually occupied by the black rook, so the re-rebirth square e7 CANNOT be cleared by the H with this move at all!.

Supposedly PopEye does not respect the shifting of the sT[h8] in a bicolour castling, and executes the indicated 1.f7-f6 Se8×e7[+sKa3]# rather like 1.f7-f6 Se8-g8×e7[+sKa3]#, and NOT like 1.f7-f6 0-0×e7[+sKa3]# (with the involvement of the black rook)...???

--> input was:
anfa
bedi Make&TakeSchach AntipodenCirce RexInklusive
ford H#1
Stei Weis Ke1 Tc1 Se8 Ba4 Bb3 Bb4 Schw Ke7 Th8 Be6 Bf7
Opti vari
Zwilling hinzufuegen schwarz Hf5
Zwilling hinzufuegen schwarz He4
Ende

--> output was:
...diagram...
h#1 6 + 4
Circe Antipoden RexInklusive
Make&TakeSchach

1.f7-f6 Se8*e7[+sKa3] #

b) +sHf5

c) +sHe4

Loesung beendet. Zeit = 0.250 s

Cornered Rook in bicolour castling #291

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