What does understanding how the match went means? Like, what was good and what was bad? Is he trying to understand what were the exact events? Or maybe have a good idea about what happened?
When people talk about how like how work went or an event, they’re asking sometimes if it was good or bad or boring or nothing good happened. If that’s related to Hydramist’s duels then I think it’s his good plays and his bad ones.
Another interpretation of the quote I have is that he’s literally looking over what happened to get an idea of what happened. If he understands how the match went then he could see what he did good or bad or if he made a mistake.