And then an Alice move is legal (as usual) when it does not expose the King to pseudo-legal Alice capture.
. As far as I can tell, this isn't quite true. It must also not expose the King during the intermediate time between the piece making its move and transferring to the other board. This can be seen in this quote from Vernon Parton's work:
Fools Mate in Alician style.
(1)P - K4, P - Q4, (2)B - K2,PxP, (3)B - Q Kt5 and the black monarch is checkmated.
Here it will be seen that the move Q - Q2 (as well as B - Q2) fails to intervene as the
Q (or B) would be transferred to the other board, still leaving their King in check to the White
Bishop.
Naturally, the move K - Q2 is forbidden, because the King would break the Alician
rule that he must make a legal orthodox move before being transferred. (This quick mate was
given by Mr. C. H. O. Alexander on radio.)
You write
. As far as I can tell, this isn't quite true. It must also not expose the King during the intermediate time between the piece making its move and transferring to the other board. This can be seen in this quote from Vernon Parton's work:
.