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was a German born Dutch painter known as '''Boldriaan'''.
=Links=
* [https://www.schaakkunst.nl/Schaakkunst_Boldriaan.htm Schaakkunst van Boldriaan]
* [https://www.schaakkunst.nl/schaakkunst_IM_Boldriaan.htm In Memoriam Rolf Föhe] (Dutch)