White to play and win
Position after 27… Nd7-b6
Meier G v Kamsky G, Tromsô Olympiad round 9 , 11 August 2014
28 Bf8! 1-0
Yet again confirming that John Nunn's LPDO maxim is so often correct, and CJS Purdy's advice to examine all biffs and to look for jump biffs are true.