Pähtz was three co-winners at German Chess Championships, twice in the East Germany (1988 with Lutz Espig and 1990 with Raj Tischbierek), most recently in 1993 together with Thomas Luther.

In 1988 Thomas Pähtz belonged to the 28th Chess Olympiad in Thessaloniki to the East Germany team and played at first reserve board (+0 =2 −1).

Pähtz won the East Germany Team Chess Championship in 1973 and 1983 with the Schachgemeinschaft Leipzig, in 1988 with Microelectronics Erfurt and in 1991 with SV Erfurt-West.

[3] From 2003 to 2006 he played for De Sprénger Echternach, with which he won Luxembourg Chess Team Championship in 2005 and 2006.

In May 2002, the German Chess Federation thanked him and acknowledged him in the form of an honorary certificate.