4Nxd4

4.Nxd4 is a chess move notation indicating that on White's fourth move, a knight captures a piece on the d4 square. In standard algebraic notation, N denotes a knight, x denotes a capture, and d4 is the destination square. The leading 4. specifies move four in the sequence of moves. The capture is typically performed by the knight that White has developed to f3, which can jump to d4 if a Black piece sits there.

Context and openings

The move occurs most often in openings that place White’s knights on f3 and c3 by the third move and contest central squares on move four. The Four Knights Game, arising after 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6, is the best-known family where 4.Nxd4 can appear as part of a centralizing plan. In other lines, 4.Nxd4 may arise when Black places a piece on d4 and White chooses to exploit that central occupation with a knight capture.

Strategic considerations

Landing a knight on d4 centralizes White’s piece activity and increases pressure on key central and queenside squares. Depending on the position, it can open lines for other pieces, provoke exchanges that relieve tension, or create tactical chances. The exact consequences hinge on what piece is captured on d4 and how Black responds next, including possible recaptures or shifts in pawn structure.

See also

Chess notation; Four Knights Game; Knight moves.