Coinflip and the cruel truth of 1.98×

Flip. 50/50. Win pays 1.98× your bet. Lose, you’re out.

It’s the cleanest fair-game you can imagine, and that’s exactly why it’s a teaching tool. If you martingale (double after every loss), you’ll win most sessions. A long session will eventually show you why most sessions isn’t enough.

With 1.98× payout, nine wins in a row barely outpaces a single 9-loss streak.

The house edge

2% paid out means that over infinite rounds, the casino nets 1% of every dollar wagered. Coinflip shows that edge in the bluntest possible terms.