Chinese Official Mahjong links

Chinese Official International Mahjong rules is an interesting rule set to Mahjong, sanctioned by Chinese authorities. Seems like a well-rounded set of rules, with a minimum winning score and some rather interesting scoring hands (shifted chows and knitted sets, particularly).

Few relevant links:

• Chinese Official Mahjong rules, a rulebook in PDF
• World-Class Mahjong with World Champion Mai Hatsune is a good strategy guide to the game.

Playing Mahjong might be nice, it's been a while since I've heard the clicking of the tiles. I played few games at MahjongTime yesterday, that seems like a fun site. However, there doesn't seem to be many players playing when I would like to play, that's the problem with sites with lots of US players. Give me Brettspielwelt and European players...