Yeah, 300 definitely seems a bit sparse.
There are currently ~1200 GMs, 3000 IMs, and countless FIDE, National, regional, district and other masters out there.
I saw something that said there are less than 1300, and I just left out the 1 by accident.
Oh, the title actually asks about chessmasters, not grandmasters. Either way, rubicks cubes are much cheaper and more plentiful.
simple as move the stickers
Solving three Rubik's cubes - while juggling said cubes - and while beating a chessmaster. I'd like to see that.
All you need to do to solve a Rubik's cube is memorize several combinations. It literally takes like 2-3 hours to learn.
Well, technically it is very easy to 'play' a chessmaster. The hard part is winning.
I think one can go to a toy store, buy a cube, and look up the answer on the internet than one can find a master.