I know that Technical Analysis works in the sense that it can give reasonably reliable indications that a stock is more likely to move up than down (or vice versa). In other words, systems with relatively high win loss ratio .

This is distinct from TA approaches that rely more heavily on stop-loss/money management aspects to make a system profitable. In other words, systems with a lower win-loss ratio.

So my question is, why/how does TA reveal opportunities that have a relatively high probability of producing a profit?