What can I actually learn by reviewing games I won, not just the ones I lost?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.
Direct answer
A win can hide real mistakes just as easily as a loss reveals them, since your opponent simply failed to find or punish an error you made along the way. Reviewing a won game honestly, looking for moments where the engine or a stronger player would have made things much harder for you, often surfaces problems a pure focus on losses never would.
Why most players skip this entirely
It is natural to file a win away as "that went fine" and move on, since the result already confirms things worked out, but a result only tells you the final outcome, not whether every decision along the way was actually sound. A won game against a weaker or careless opponent can be full of the exact mistakes that will lose you the next game against someone stronger.
What to specifically look for
Points where your opponent had a better move available and simply missed it, moments where your advantage was larger earlier in the game than it was by the end, and any decision you now recognise as risky even though it happened to work. These are the mistakes most likely to resurface and actually cost you against tougher opposition.
Related questions
Should I spend equal time reviewing wins and losses?
Not necessarily equal, but wins deserve a real slice of your review time rather than none at all.
Isn't this the same as reviewing every game generally?
It is part of the same habit, but the specific point here is not skipping wins purely because the result already felt satisfying.