Paul Keres v Giuseppe Stalda, postal game 1934. Estonia's Keres was one of the finest players never to become world champion. His career was blighted when he competed in wartime German tournaments. On his return home Soviet authorities, who favoured Keres's Russian rival Mikhail Botvinnik, coerced him with threats to his family. Though no smoking gun has emerged, suspicions linger that Keres chose to play below form when he lost four straight games to Botvinnik in the 1948 world title event. As a youthful talent, Keres honed his game by postal chess, taking on 150 opponents at once. When he died, thousands attended his funeral and he was honoured with his image on a stamp. Here Keres looks set for victory with his Qg6 mate threat, while the queen also stops Qxe2+. It looks resignable for Stalda, but the Italian produced a surprise resource. What happened?