Ment
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Well, basically, Relsh needs to land a critical hit on the first turn... and hit often.
There's a chance even after the enemy's counterattack, but there's about a 2/3 chance that at least one of their attacks will hit. And a 63% chance that it will be a critical hit. In short, if you don't kill the enemy on the first turn, there's a little over 50% chance of winning.