Albert Fox v Emanuel Lasker, Cambridge Springs 1904. Lasker held the world title for a record 27 years, yet remains a controversial and enigmatic personality. Bobby Fischer disparaged him as “just a coffeehouse player”, while Mikhail Tal praised him as “the greatest of all world champions”. In Why Lasker Matters by Andrew Soltis (Batsford, £15.99), a US grandmaster probes the secrets of the legend’s long career and provides in-depth analysis of 100 key games. It’s an instructive and fascinating read. In today’s puzzle material is level, and White was looking forward to half a point. What was Laskers winning black move?