David Janowski v Ewfim Bogolyubov, Mannheim 1914. When grandmasters blunder, you can sometimes point to an offboard distraction, and I guess this was so on the present occasion when Bogol (Black, to move) went 1...Bc8? It looks normal, but by elite GM standards it is quite horrific. The Mannheim tournament began in late August 1914, just as Europe was sliding towards war. The event was halted several rounds from the finish, and the Russian players, including Bogol, were interned for the duration. He was not to know then that his imprisonment would become a brilliant stimulus both professionally and personally. The internees had four years to hone their game without interruptions, and after the war Bogol settled in Germany, twice challenged Alexander Alekhine for the world title, and married a girl he met in his new home, Triberg. Though it doesn’t completely excuse his Bc8. How did Janowski force a win after the bishop retreat?