is trading a game of probability?

I agree trading is about probability because no matter how good a strategy is, it can never work all the time.

For me, I try to execute the same strategy over and over again then take note of the number of winners and losers. With that information I can tell the probability that the next time i take the same trade it will go in my favor. You can also back-test the strategy with historical data to see its win-rate.

Not just probabilities, trading is also a game of averages and that is why pivot points are effective.