Common questions
Is this real-money poker?
No. The daily puzzle is education only. There are no bets, no accounts and no real-money gambling.
Why the rule of 2 and 4?
It is a quick, well-known estimate: multiply your outs by 2 with one card to come, or by 4 when you will see two more cards. It is close enough to make good decisions at the table.
What does this have to do with medicine?
I use poker math to teach deciding under pressure with incomplete information, the same skill emergency medicine demands. It is the heart of my decision-making keynote.
Written by Harvey Castro, MD, MBA, board-certified emergency physician. Last reviewed October 25, 2026.