The position below is taken from S Coughlan - I Gooding (Board 1, Witham A v Colchester A, 2017), black to play. When you put this position into the computer it spots the best move straight away but thinks that there are many other moves that are also winning. It is only when you leave it to think for a while that it realises that there is only one move to win. What is it? Answer in the comments.