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German Record Holder

06 Mar 1999 - 02 Jun 2003
accuracy : 2,770
time : 1 hour 10 minutes

World Record Holder "The Ultimate Test of Pi"

since 07 September 2002
accuracy : 1,000
time : 51 minutes 40 seconds  

Mental Calculation :

World Record Holder
multiplication of two 8-digit numbers

28 February 2003 - 11 January 2004
time : 50.88 seconds

and again

since 19 March 2004
time : 38.14 seconds

World Record Holder
multiplication of two 5-digit numbers
(10 tasks in a row)

since 25 November 2005
time : 3 minutes 6 seconds