Grünfeld Defence: Exchange, Spassky System

A factual read of the position after the main line — the files, the centre, the pawn structure and king safety that decide how the middlegame is played. These are computed from the actual board, not generic advice.

• 1White plays down the b-file — with no White pawn there, a rook lift and pawn lever turn this file into direct pressure on b7.
• 2Black's counterplay runs down the d-file: it is half-open for Black, so the rooks swing there to hit d2 while White is busy elsewhere.
• 3Play around the fixed weaknesses: White's isolated a-pawn can be blockaded, piled on, and won in an endgame — trade pieces if you are attacking it, keep pieces on if you are defending.

• Target the isolated white a-pawn. Blockade the weak pawn on its square, pile pieces against it, and steer toward an endgame where it simply cannot be defended.
• Neutralise the d-file before Black owns it: challenge with your own rook, or close the file with a pawn so the opponent's main artery of play dries up.
• As White, aim first for a healthy structure and finished development — a position with no targets defeats theoretical preparation on its own.

These openings arrive at the very same board position by a different move order — a transposition. Knowing them lets you steer between systems and recognise when your opponent has walked into familiar territory.

Ernst Grünfeld introduced 3...d5 in 1922, beating world championship contender Akiba Rubinstein that same year.

Expert-grade warfare. The forced lines run deep, the evaluations are narrow, and preparation is half the battle — a weapon for Black players who live in the engine age.