OK, there's a 5 next to this square and also a 4 so ...one, two three, if it's a mine then the one next to isn't, in which case that one is a 3 and that one is a 2 so that one is a mine and that one is either a 2 or a 3, so if it's a 2 then that one must be a 2 as well, but then one can't be a 1 so that one must be a 3 which means this one is a 1 or else if that first one isn't a mine then that one is so that one is a 2 and so is that one, and so that one is a 1 which is impossible so that one is definitely a 1 so this one must be a mine! *click. Oh b*gger.