Arkell-Osborne, e2e4.org.uk Sunningdale Open, round four, 7 July 2013. Position after 41...Kf8-e8.
It's a tough one, this, but there's no tougher competitor in British chess than Keith Arkell and in the position above, he found the Worst Move On The Board. Can you?
[Thanks to Jack Rudd]
[Worst move index]