Flash is out - entirely too dangerous. I remember 35 years ago a friend using a flash 3 feet outside the ring, just as I put a roundhouse kick upside a guy's head. It's a wonderful photo, but it did almost blind me for a couple seconds.
I'll definitely be using B&W. I learned that lesson back in my daughter's gymnastics days. Color gets too weird and a fld filter takes away another stop or so.
Gymnastics was easy at iso 400 because the real dramatic things happen when they are really not moving very quickly. Photographing a team through a season, I got to know the girls' routines and could focus on certain locations and wait for what I knew they would do there. The test should be pretty similar to that, but the tournament is more unpredictable.
As to lenses, I'd really like to use the 80-200 to frame the action at varying distances, but it's probably too slow. The only prime lenses I have that will go f2 or larger is 50, but that won't get in close enough. I have a 200mm from Goodwill that I haven't even used yet, but that might be to slow and too long.
I just came back from metering the gym. It's an overcast day (hey, we do get 60 of them a year) and the EV came out varying from 9.5 to 10.5. I'll go back again and meter on a sunny day. It looks like it will have to be Delta 3200. Hmm. I've never used diafine. Not sure if it's even available locally.
Have any of you been happy with tmy2 or tri-x at 3200? That Portra example looks great, but I'm resistant to using color.