The Colle–Koltanowski System - Simon WilliamsThe ColleKoltanowski System by Simon Williams A real favorite among club players. The Colle Koltanowski system is very easy to learn, yet an extremely dangerous opening. White goes for a simple set up, aiming all of his pieces towards Blacks kingside. White doesnt need to rely on learning reams of opening theory to master this opening, therefore suiting players who do not want to spend their entire spare time reading, watching and learning thirty