Here is a corrected 8-round set of scheduled matches for the mixed doubles problem. Best, Dick Hess Best Known Mixed Doubles Scheduling for 20 Players Court 1 Court 2 Court 3 Court 4 Court 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 10 7 18 3 12 19 4 5 8 13 2 9 16 17 6 11 20 15 14 1 16 19 2 3 6 17 10 5 18 15 12 7 20 11 8 9 14 13 4 1 4 15 6 3 14 5 12 7 16 9 20 11 10 17 2 13 8 19 18 1 20 5 10 3 8 11 16 7 12 15 2 9 6 19 14 13 18 17 4 1 14 17 8 3 2 15 18 5 20 9 4 7 10 19 16 11 6 13 12 1 12 13 20 3 18 7 14 5 4 17 16 9 8 15 10 11 2 19 6 1 8 9 12 3 20 13 6 5 16 11 18 7 2 17 14 15 4 19 10