Chess forks
Stockfish 16.1 · runs in your browserPlay Nc7+. The knight on c7 attacks both the king on e8 and rook on a8.
Play on the board, or use Type a move below it.
Play a move by typing it, like e4, Nf3 or e7e8q, then press Enter.
Commentary
Move a piece, paste a position, or press the button.
Best move
A fork attacks two or more targets with one piece. A knight can fork a king and rook: the check forces a response while the rook remains attacked. Play Nc7+ and inspect both attacked squares.
Try the moves
Choose an example, play the suggested move, then reset to compare another legal move.
Rules and examples
The board positions are original teaching examples. Rule references and further practice are linked below.
Rules: FIDE Laws of Chess, effective 1 January 2023. https://handbook.fide.com/chapter/E012023
Rule replay: python-chess 1.11.2 (GPL-3.0-or-later). The shared browser engine retains its Stockfish GPL-3.0 notice. No engine score is claimed by these demonstrations.
See the referenceA move on the board
r3k3/8/8/1N6/8/8/8/4K3 w - - 0 1
r3k3/2N5/8/8/8/8/8/4K3 b - - 1 1
- Nc7+The knight on c7 attacks both the king on e8 and rook on a8.
The knight on c7 attacks both the king on e8 and rook on a8.
Original teaching example replayed with python-chess 1.11.2, 2026-10-18.
Analysis runs on Stockfish 16.1 in your browser, compiled to WebAssembly by stockfish.js. Stockfish is free software under the GNU General Public License v3; its source code is on GitHub.