If you choose your moves randomly in equal proportion, then you will always win 50% of the time no matter what the other player does (not counting ties). But h

If you choose your moves randomly in equal proportion, then you will always win 50% of the time no matter what the other player does (not counting ties). But humans are bad at making truly random choices. If your opponent isn't random, you can exploit what they're actually doing. And if you're exploiting what the opponent is doing, then you're not random anymore and your opponent can exploit what you're doing.