[from Eric Angelini -- Rich] ------------ Date: Tue, 23 May 2017 11:36:01 +0200 Subject: Chess weirdness From: Eric Angelini <Eric.Angelini@kntv.be> Hello math-fun, Here is the chess problem I was mentioning in my last post: +---+---+---+---+---+---+---+---+ | | | | | k | | | r | 8 +---+---+---+---+---+---+---+---+ | | | | | | | | | 7 +---+---+---+---+---+---+---+---+ | | | | | | B | | P | 6 +---+---+---+---+---+---+---+---+ | | | | R | | K | p | P | 5 +---+---+---+---+---+---+---+---+ | | | | | | | | | 4 +---+---+---+---+---+---+---+---+ | | | | | | | | | 3 +---+---+---+---+---+---+---+---+ | | | | | | | | | 2 +---+---+---+---+---+---+---+---+ | | | | | | | | | 1 +---+---+---+---+---+---+---+---+ a b c d e f g h White to move; mate in 2 The "problem" is that there is -- and there is no mate in 2! Kind of a 2-states quantum superposition! If you had the White pieces, what would your first move be? Best, É.