7 Card Poker Hand Evaluator

Question

Does anyone know a fast algorithm for evaluating 7 card poker hands? Something which is more efficient than simply brute-force checking a every 21 5-card combination of hands fr

Answer 1

Of course, if you want to do it very fast. The algorithm i put before is too slow.

The table7462 shoul be in an array, not in a file.

Then, you should precalculate every different 7cards hands and store it to a database. There are 133.784.560 different 7cards combinations.

You should use this format (alphabeticall order):

"2c2d2h2s3c3d3h" and rank it

Store every 133.784.560 different combinations. You do 52C7 cicles, rank it and store it in a database. Maybe in a few days you have it ready. When you have it ready, you don´t need 21 combinations anymore, just put your hand sorted alphabetically and search for it in your database.

If you do that, you´ll see that you can calculate your odds against your opponents in real time whenever you need.

Believe me. I am not a programmer and i can do it. I know my odds at the flop in 3 seconds.

Answer 2

May I recommend https://github.com/chenosaurus/poker-evaluator/

It is written in JavaScript and uses a 128 MB HandRanks.dat file.

The code is just a few lines and very easy to port to any other language.

Answer 3

I developed an algorithm for 7-card hand evaluation without iterating all 21 combinations.

Basically, it splits the 7-card hand into two categories: flush and not a flush. If it's a flush, it would be easy to look up the value in a table of 8192 entries. If it's not a flush, it'll run a hash function with techniques of dynamic programming, and then look up the value in a hash table of 49205 entries.

If you are interested, please check my work at github.

https://github.com/HenryRLee/PokerHandEvaluator