Path to menu: Main Menu - Challenge - Computer
With skirmish we mean: a matched AI opponent based on your ELO score.
The name and ELO rating of the AI opponent is listed.
Difficulty currently maps to engine level, where 10% equals 1 level. So a difficulty of 52% would be an AI with level 5.2
The engine is automatically chosen based on level. For the level range 0-20, three distinct engines are used. This is to accommodate beginner, average and advanced players best.
You can not play skirmish AI opponents that are higher AI level than your current board supports.