2 May
2017
2 May
'17
2:29 p.m.
EA: "In order to forbid Black to short-castle White has to long-castle." The 'mutually exclusive castling' composition by Armand Lapierre appeared in 1959. Miroslav Havel was apparently the first to notice the possibility of such a thing and used it in 1922: http://b3rn0ull1.blogspot.ca/2012/03/unexpected.html RWG's tricky mate is by Samuel Loyd, 1859.