Panov Attack

The Panov Attack, often called the Panov–Botvinnik Attack after Vasily Panov and Mikhail Botvinnik, departs from the Exchange Variation by striking at d5 with 4. c4 instead of developing with 4. Bd3. The pawn on d5 comes under immediate pressure, so Black is pushed toward an open game instead of the slow Carlsbad structures of the quieter exchange lines. The position can also be reached from the Accelerated Panov, 1. e4 c6 2. c4 d5 3. exd5 cxd5 4. d4.

The usual outcome is an isolated queen's pawn on d4 once the c-pawns and the d5-pawn have been traded. White gets quick development, control of e5 and chances against the black king. In return the d4-pawn is a lasting liability, and Black, who blockades on d5 and aims for exchanges, hopes to reach an endgame where that weakness is felt. Both sides have to judge accurately when to keep pieces on and when to simplify.

4...Nf6 is the standard reply and is chosen in about half of the games, while 4...Nc6 and 4...e6 are less common. The 4...e6 line once had a poor reputation, but it is now regarded as playable, as is 4...g6. After 4...Nf6 5. Nc3 the Main Line is 5...e6 6. Nf3, where 6...Bb4 frequently transposes into Nimzo-Indian structures and 6...Be7 was formerly the most popular choice. 6...Nc6 is considered imprecise because 7. c5 lets White release the central tension and fight for e5, either by pushing the b-pawn up the board to dislodge the knight or by playing Bb5 and capturing on c6. The Modern Defense, 5...Nc6, puts pressure on d4 at once, and the Fianchetto Defense, 5...g6, develops the bishop to g7, where it bears on the same pawn. The Gunderam Attack, 5. c5, gives up the isolated-pawn plan altogether in favor of a queenside space grab.

The play is theoretical, and its character depends on whether White's piece activity or Black's structural trumps prevail. In the Lichess database White scores slightly better than Black, and draws are uncommon, while the engine assessment is close to level.