A long time ago I wrote an introductory post addressing some technical aspects of bet-sizing, with an emphasis of betting to get all-in by the river. I introducedÂ alpha, Î±Â as the ratio of the bet-size to the current pot.Â
A quick reminder:
Â A pot-sized bet has an Î± of 1. A half-pot-sized bet has an Î± of 0.5. When theÂ SPRÂ is 13 we can make a series of three bets with an Î± of 1, concluding with a final all-in bet. For example, with a $130 stack and a $10 pot, we can bet pot on the flop, turn and bet all-in for pot on the river ($10, $30 and $100 bets).
CalculatingÂ appropriateÂ bet sizes when the pot-to-stack ratio (PSR) is not 1, 4 or 13 is not simple. For example, with a PSR of 7 it is not immediately obvious what fraction of the pot to bet, given that you want to be all-in in three streets with the sameÂ Î± on each street. In order to assist those who are interested in these calculations, I wrote a little spreadsheet that can instruct you of these "perfectÂ Î±" bet-sizes. You can "Save a Copy" if you want to enter your own values (you will need a Google account).Â
In itself, betting with equalÂ Î± on each street isn't *that* important. However, a few minutes spent with the calculator establishing the SPR that make it awkward to get all-in over 2- or 3- streets can be of great use when planning a hand preflop, or deciding on your bet or raise sizing in general.Â Â One great example would be re-raising an unpaired high-card hand preflop, a situation in which we are deliberately bloating the pot so that if we hit top pair we can get all-in easily with three smallish bets, or, if we choose, two larger ones.Â CertainÂ SPR make this a lot easier than others; there are manyÂ variablesÂ to consider, but these ideas can all be contained within one question, "What will the SPR be if I get called?". It might be worth playing around with the calculator and thinking about your raise sizing, so you can plan your postflop bet sizes in advance.