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It helped me to think of it this way: Alice is guessing that their coins are different (one possibility) and Bob is guessing that their coins are the same (the
by ColinDabritz 11y ago
It helped me to think of it this way: Alice is guessing that their coins are different (one possibility) and Bob is guessing that their coins are the same (the other possibility), so from either direction they are covered.
- yukinon 11y agoThanks. I think this was the reply that actually helped me understand this.
- imdsm 11y agoYeah it still took a minute. The way I realised it was Bob is covering them for the same flips, so if he flips H, he covers if Alice flips a H too. But if she flips a T, Bob is no longer covering her, but she knows when Bob isn't covering her, if she guesses for the opposite, she'll cover them. 100%. The next level is: Eve joins the game, and the coin gets another side.