Duden
Rating table notes
Tournament data
Oldenburg 1912 1st East Frisian and Oldenburg Chess Federation Tournament 3 / 4 Duden - Nagel, B. 0 - 1 Duden - Hartlaub, C.O. 1 - 0 Wilhelmshaven 1913 2nd East Frisian and Oldenburg Chess Federation Tournament 1.5 / 5 Oldenburg 1914 3rd Oldenburg-East Frisian Congress 0 / 4