There's no such thing as "my pawn, my piece" or "your pawn, your piece" in this hall of whimsy. In other words, if I can move a piece or pawn, my opponent can move it too - and vice versa. Ravishankar, who had a particular fondness for the oddities of shared control. Problem 01Mate in 2 (All-in-Chess)S. N. Ravishankar, The Problemist, 2016If this were normal chess, 1.a8=Q+ Kxh2 2.Qg2# would simply solve the problem. Well… if this were normal chess, Black couldn’t have moved last, and the position itself would be illegal with White to play!