It is possible to take the standard whist design (15 rounds of 4 games) and transform it so that it is played over 20 rounds with 3 games per round. For example:
round court game
1 1 ( 7 10 v 8 9)
1 2 ( 3 15 v 2 16)
1 3 (11 14 v 12 13)
2 1 (12 16 v 2 11)
2 2 ( 3 10 v 4 9)
2 3 ( 5 8 v 6 7)
3 1 ( 3 6 v 4 5)
3 2 ( 2 14 v 15 16)
3 3 (10 13 v 11 12)
4 1 ( 6 9 v 7 8)
4 2 ( 1 2 v 3 16)
4 3 ( 4 15 v 5 14)
5 1 ( 1 13 v 12 14)
5 2 (11 15 v 10 16)
5 3 ( 4 7 v 5 6)
6 1 ( 1 14 v 13 15)
6 2 ( 8 16 v 2 7)
6 3 ( 9 12 v 10 11)
7 1 ( 1 7 v 6 8)
7 2 ( 5 9 v 4 10)
7 3 ( 3 11 v 2 12)
8 1 ( 1 9 v 8 10)
8 2 ( 7 11 v 6 12)
8 3 ( 5 13 v 4 14)
9 1 (12 15 v 13 14)
9 2 ( 2 6 v 7 16)
9 3 ( 8 11 v 9 10)
10 1 ( 1 16 v 2 15)
10 2 ( 3 14 v 4 13)
10 3 ( 5 12 v 6 11)
11 1 ( 2 9 v 3 8)
11 2 ( 1 11 v 10 12)
11 3 (13 16 v 14 15)
12 1 ( 1 15 v 14 16)
12 2 ( 2 13 v 3 12)
12 3 ( 4 11 v 5 10)
13 1 ( 1 4 v 3 5)
13 2 ( 8 15 v 9 14)
13 3 ( 6 13 v 7 12)
14 1 ( 1 6 v 5 7)
14 2 ( 4 8 v 3 9)
14 3 ( 2 10 v 11 16)
15 1 ( 1 8 v 7 9)
15 2 ( 6 10 v 5 11)
15 3 ( 4 12 v 3 13)
16 1 ( 1 3 v 2 4)
16 2 ( 5 16 v 6 15)
16 3 ( 7 14 v 8 13)
17 1 ( 1 5 v 4 6)
17 2 ( 3 7 v 2 8)
17 3 ( 9 16 v 10 15)
18 1 ( 1 10 v 9 11)
18 2 ( 8 12 v 7 13)
18 3 ( 6 14 v 5 15)
19 1 ( 1 12 v 11 13)
19 2 (10 14 v 9 15)
19 3 ( 4 16 v 2 3)
20 1 ( 9 13 v 8 14)
20 2 ( 7 15 v 6 16)
20 3 ( 2 5 v 3 4)