Nimzowitsch Defense

In algebraic notation, c6 means column c and row 6. The Nimzowitsch Defense begins when Black moves the b8-knight to c6 against the advance of White's pawn in front of the king. The knight approaches the center but does not attack the e4-pawn immediately. White commonly uses the opportunity to play d4 and control more central squares.

...Nc6 develops first and defines the counterattack later

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StartNc6d4d5e5Bf5

1...Nc6 takes the knight to a square from which it controls d4 and e5. The move does not attack e4.

Black brings a piece toward the center without attacking e4

The Nimzowitsch begins with flexible development but leaves White free to occupy d4.

1. 1...Nc6 takes the knight to a square from which it controls d4 and e5. The move does not attack e4.

Black then chooses how to challenge that center. The characteristic replies are d5, which attacks e4 directly, and e5, which occupies the center and may lead to positions from other openings. When different move orders reach the same position, the result is called a transposition.

...d5, ...e5, and ...c5 do not serve the same function

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...d5 attacks e4 in one sequence and creates immediate pawn tension.

The knight's placement changes Black's pawn options

Black keeps two immediate central responses but has delayed a third.

1. ...d5 attacks e4 in one sequence and creates immediate pawn tension.
2. ...e5 occupies the center and can transpose to another opening family without creating the same structure as ...d5.
3. ...c5 would attack d4, but Black's own knight on c6 physically blocks the advance.

The system is uncommon and flexible, but the knight on c6 temporarily blocks the c7-pawn. That can slow c5, a common pawn advance used to attack White's center. Black must choose whether to move the knight again, rely on d5 or e5, or accept that the c-pawn will take longer to participate.