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I think your assumption that the pot has to be 20BB is roughly correct. That would assume you played any 2-suited cards, regardless of which they were and your position. If thats the case, you would be spending 10-11BB before a 4-card flush draw flops. Afterwards, 2/3 of the time you would be betting flop/turn w/o turning a flush or another 3BB. Total BB before getting a flush (i think) is 26BB.
However, if you play in position, small-suited connectors (in multi-way pots), and large suited-connectors, the amount of money you spend getting a 4-card flush draw should balance-out with the extra strength of straight draws, top-pair draws, and being in-position. Knowing that, if we assume that you started the hand w/ a 4-card flush flop already:
- 2/3 of the time you would pay 4BB (or 8BB) total before making a flush
In this scenario, you would need to win 8BB to break even, or 2 other opps have to play and call your river bet or make profit. If one drops on turn and another drops on river, you break even only if SB/BB money are there too. I guess thats why its a good rule of thumb that if you are drawing to a straight or flush draw that you have at least 3-other opps in. The other rule of thumb you mentioned is if you think the final pot size will be over 20BB, then chasing the flush or straight draw is good. Most HtoH to to river I play are about 75%ish of that.
Hm, maybe another rule of thumb for: Should I call the the bet based on the number of outs in my hand?
1 / [(# of outs (/100)) * 2 * (your bet, e.g. 1BB for flop bet)] should be less than what is in the current pot. Or if you have flush draw, thats 9-outs or 18% -> 1/.18 -> 5.56BB. Thats about the same number if 3-opps call the flop bet (6BB).
Oh, I am not sure what BB is to folks. I am assuming its the amount of the Big Blind, not Big Bet which maybe could be 2x Big Blind
If I am way off base, please let me know.
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