bjsim

Blackjack odds calculator

See --help for an overview of options.

When printing strategy tables, the columns are the dealer's first card and go 2-9,J,A. Rows are your cards; 1 represents ace and 0 represents 10,J,Q,K (sometimes collectively referred to as Js in the rest of these docs/code).

You may take the rows for (0,*) and (2,*) to represent approximate strategy for any hard (no-A) hand totalling the same amount (e.g. (0,9) = any hand totalling 19); this is not strictly correct but is much much faster to calculate. I may fix this in the future, or at least give the user an option to sacrifice speed for correctness.

Red

Stand

Green

Hit

Yellow

Split

Cyan

Double (double your bet, hit exactly once then stand)

Purple

Surrender (lose half your bet)

Note that in some games, not all of these actions are allowed, and so won't show up in the final table.

Accuracy

This program will undoubtably generate tables that differ from other strategy-tables you might find online. Hopefully these discrepancies are minor; but possible explanations for them are:

• Perhaps you input preconditions into this program that are different from what the other table used.
• This program is not perfect and I did approximate certain things so the computation finishes in a reasonable amount of time.
• The other table is at fault; most online tables just give you a bunch of commands and you have to "trust them" - they could very well be incorrect rather than this program.

Disclaimer

Should you wish to use this program for something stupid such as trying to win any actual games of blackjack, please see LICENSE for a full legal disclaimer.