I'm not sure if it's answered before somewhere, but here it comes: What is the purpose of IceAge chess, to mate the King or take the king? It is a difference if you put him checkmate as white in move 20, he makes his 20th move and then the ice stops the mate Eg backrank mate with wRe8, BKg8, Pf7,g7,h7: Blacks 20th move (he is mate) Kh8, and now the ice age comes...