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

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