[Mike Haven]

If you play one game of 10-20 let's agree you need a 6,000br, or a 300bbbr.

Whether you play this one game fast or slow is irrelevant; you still only need this 6,000br.

However, independently, each game you play needs this 6,000br, so if you played 4 tables at once and kept separate bankrolls for each game, for some strange reason, you would need a 24,000br in case each one of your games hit a major downslide at the same time.

Obviously, you don't really need to keep 4 separate bankrolls, because, in theory, you would have to reduce the number of games you were playing to 3 once your total br reduced to 18,000, and to 2 at 12,000, down to 1 at 6,000, to stay in line with standard br advice.

Working up the other way, as long as you know you should reduce to 1 game once your br has reduced to 6,000, then, in practice, it is alright to "push your luck" a little and play more than one game.

There is an exact mathematical way to work it out, but it is probably reasonable to say that a 100bb downturn on each table at once would be "unlucky", so, if you are playing four tables, with a view to reducing to 1 table in a "br emergency", a 4,000 + (4x2,000) = 12,000br should be safely sufficient.

That's a 600bbbr for a 10-20 4-tabler.

imo