user: Question: What was the maximum round where Marc Lieb Richard Lietz was on the GT2 Winning Team?
Columns: ['Rnd.', 'Circuit', 'LMP1 Winning Team', 'LMP2 Winning Team', 'FLM Winning Team', 'GT1 Winning Team', 'GT2 Winning Team', 'Results']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Paul Ricard', 'No. 7 Audi Sport Team Joest', 'No. 42 Strakka Racing', 'No. 49 Applewood Seven', 'No. 50 Larbre Compétition', 'No. 77 Team Felbermayr-Proton', 'Results']
SQL:

assistant: SELECT MAX("Rnd.") FROM "Table" WHERE "GT2 Winning Team" = 'Marc Lieb Richard Lietz';