Thal Abergel v Oliver Jackson, Isle of Man . Manchester veteran Jackson, the fall guy in yesterday's puzzle, is again the victim of an instant knock-out today. Black is two pawns down, but at first sight his position is not bad. The black army is actively placed, and if he can castle, bringing his second rook into action, White's c1 king would come under pressure. Moreover, White (to play) cannot make the obvious capture 1 Bxb because of his exposed e queen. But all Jackson's neat theoretical dreams collapsed when White's next turn forced him to resign. Can you find White's move which ended the game?