[You're No Daisy]

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is it a leak to always bet the same size. IE 3/4 2/3 when cbetting?

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No this is not a leak and neither is mixing it up a little. If you bet 3/4 of the pot when c-betting with air and bet 3/4 of the pot when value betting the flop, it's more difficult to figure out. Same goes with firing a 2nd barrel on the turn. You do 2/3 with air because you think villain is drawing (and he folds) and you do 2/3 with a strong made hand the next time (and he calls) it's more difficult to figure out what you actually have.

OTOH...if you make a 3/4 PSB with air all the time and a full PSB with a made hand all the time, most observant players will figure this out. Same goes with bet sizing on the turn. However, mixing it up on occasion is good too. Most players at the micro stakes are not very observant but it's still very good practice to think about what you bet sizing is on all streets and what your opponents think they know about your bet sizing. If you think they're catching on, you might be very transparent and you should switch things up a little to throw them off.