Greasy Fork镜像

What does that mean? percentage of win rate? it also showed me once 10% of win with win but also 50% with lost msg, how does it works

The message starts with the automatic result of the current battle. You can try changing it manually.

The precalculation also runs N test battles (you have 20) with a different random number. The percentage shows the number of victories in test battles.
If it shows 50%, it means that 10 out of 20 test battles resulted in victories.
This parameter can roughly indicate the chance of winning this battle.