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    vs.      
Jonas Koestler is tied in the series against Bertil Elfgren, 1-1.

event round table player one result player two
Grand Prix Paris 20117610Koestler, Jonas (1898)Lost 1-2Elfgren, Bertil (1931)
Grand Prix Pittsburgh 2011596Koestler, Jonas (1908)Won 2-1Elfgren, Bertil (1843)