Career
In 1999, he tied for second with Vlastimil Jansa in the Donne Haas Memorial in Luxembourg. He transferred from the Swedish Chess Federation to the Luxembourgian Chess Federation in 2010. Wiedenkeller played for Luxembourg in the Chess Olympiads of 2010, 2012 and 2014.
He was knocked out in the first round by Levon Aronian.
According to Chessmetrics, at his peak in October 1984 Wiedenkeller"s play was equivalent to a rating of 2589, and he was ranked number 159 in the world. His best single performance was at Eksjö 1983, where he scored 4.5 of 5 possible points (90%) against 2488-rated opposition, for a performance rating of 2626.