The Old Benoni – Mujannah Formation arises after 1.d4 c5 2.d5 f5. ECO code: A43.

Overview

With 2...f5, Black creates an unusual hybrid of the Benoni Defence and Dutch Defence structures. The f5-pawn controls e4 and aims for kingside activity.

Strategic Themes & Plans

Black seeks kingside attacking chances while maintaining the Benoni pawn formation on the queenside. However, the early ...f5 weakens the e6-square and the e8–h5 diagonal. White should aim to exploit these weaknesses with e4 or Bg5, targeting the light squares in Black's camp.