This year, From March 28 Through April 1, 2007, The 2007 World Sudoku Championship will take place in Prague, Czech Republic. This championship is sponsored by the World Puzzle Federation. The World Sudoku Championship competitions consist of individual as well as National Team competitions.
It seems like it would be an interesting way to play along (nearly concurrently) if the puzzles are published on that site during the competition. I’m looking forward to it. I missed the 1st World Sudoku Championship and conference held last March 2006. Twenty-two National Teams were represented there.
By downloading the 2.4 MB pdf file via the Sudoku booklet link, you can see the kinds of Sudoku variants that the contestants were exposed to and can solve separately and check your answers with the solution. The game titles are given in the Schedule page, consistent with the instruction booklet.
It’s an amazing collection of variants. Practicing for speed and correctness must be grueling as much before the matches as during competition play.