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I am wondering that, how many BB should I buy-in in this club? I usually buy-in 250bb, lots of fish buy-in 200bb.
With fish you generally want to cover everyone. So if they buy in with 200bb, it's likely the bigger stacks are 400bb+, so you want to buy in at least that much.
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Should I play more tight (my VPIP/PFR is 30/24 now)? But the game includes antes.
Now I find that, the basic open is 7bb, and add 1bb/limper. Therefore I usually raise 100~120 at 5/10(2) stake
I think you need to view it a lot more situational and less global.
In some spots, you need to be very tight:
Open raises in early, forget raising anything speculative, and raise big, 7bb sounds ok
In some spots you you need to be very loose:
3 people limp, you are on CO/BU, with 200bb+ stacks, you can limp behind any nut-potential hand like 54o
For raise sizing, you should absolutely size by hand strength.
You have AK in early position, maybe raise 10bb, as that hand is most powerful with 1-2 opponents and shorter SPR where you can play top pair hard. You have 77 early position, maybe raise 3bb, as that hand doesn't care too much how many people come in and wants a smaller preflop raise to lose less without set but can still win a stack with a set.
You're allowed to play very creatively with these guys. When you raise different sizes with different hands it might seem obvious to you what's going on. But it won't be obvious to them. And even if they notice, they have no idea what to do about it. (In any case you can balance dual sizing too, if you really need to)