Uli and Wolfi Finckh
Follow this link to an on-line Sailing Rules Quiz courtesy of Uli and Wolfi Finckh. You can play the game in a number of different ways: by rule number, at different positions around a course, or play it at random but set the difficulty level to suit your needs.
This an excellent site, well worth a visit to learn more about the rules and to test your knowledge. Suitable for both the novice and expert.