Casinos know their vulnerabilities. That is the reason they set maximum limits. Especially American casinos. If the max. limit on one number is $200 then a split involving that number also has $200 limit. And also a quad that includes that number. And a street also has $200 etc.

They call it $200 limit "in any way" if the bet includes a number that has 200 bet on it.

In European casinos (at least the ones I was visiting), if a bet on a number has 200 € limit, a split has 400 limit, a quad 800 limit, a street 600 limit a DS 1200. ( That is the 200 limit per number multiplied by the number of numbers included in a bet).

Anyway casinos know that even a system can beat them, otherwise they would have no reason to set limits. In fact if they are certain that all systems fail, they would encourage larger and larger bets by having no limits at all.

But the fact is that they are very serious about limits.

I once witnessed a situation where 2 players had 200€ on a number at a table where the max was 100. (2 players 100€ chip each).

When the number came they refused to pay 7,000. They only paid 3500.

They claimed the 2 players were playing together, because they were talking to each other as being part of a team (which was the case).

The funny thing is when they were losing with 200 on a number they did not return the 100€ chip to one of the players.