Beginner: Knowing Your Opponent

From player Enigma's Stratego.com forum post

There's only one statistic I need to look at to figure out my opponent's ability - win percentage. This assumes the player has played at least 100 games (not including quick matches). The random pairing of opponents makes this simplification possible.

< 50% - Beginner 50-70% - Intermediate 70%-80% - Advanced 80-90% - Expert 90% or higher - Elite