p.
Any move played should be legal on the board it is done,
and result in a legal situation on the other board. For example
1.Pe4 Pd5 2.Be2!? Sxe4?? 3.Cb5# is checkmate because
3...Kd7 is not valid on board 1.
p.
Any move played should be legal on the board it is done,
and result in a legal situation on the other board. For example
1.Pe4 Pd5 2.Be2!? Sxe4?? 3.Cb5# is checkmate because
3...Kd7 is not valid on board 1.