The fifty-move rule
Stockfish 16.1 · runs in your browserFirst drag White's rook from a1 to b2. The board refuses a diagonal rook move. Then play Ra2 to reach 100 halfmoves.
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Best move
A player may claim a draw after fifty moves by each side without a pawn move or capture. A pawn move or capture resets the count. This example starts at 99 halfmoves; Ra2 reaches 100. This claim rule is separate from the automatic seventy-five-move draw.
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The fifty-move rule lets a player claim a draw after fifty moves by each side with no pawn move and no capture. A single move by one player is a halfmove, so the qualifying span contains one hundred halfmoves. This board is an original teaching position whose counter starts at 99. Play White's Ra2: it is a rook move without a capture, so the counter reaches 100. The board demonstrates the threshold; it does not claim that this position came from a recorded fifty-move game.
Before Ra2, try dragging White's rook diagonally from a1 to b2. The board refuses it because a rook moves along a rank or file. An illegal attempt does not advance the halfmove count; play Ra2 to reach 100. Black moves next, so both players' turns belong in the fifty-move span. A pawn move or a capture would reset the count to zero. The rule is about what happened during the preceding moves, so an arrangement of pieces alone cannot establish a valid draw claim without its history.
Under FIDE rules the fifty-move draw is a claim, not an automatic result at the threshold. The related seventy-five-move rule does end the game automatically, except where the last move checkmates. Online chess services may apply claimable draws automatically under their own interface rules. If you are playing over the board, keep the score of moves and verify that no pawn moved and nothing was captured before claiming. If a pawn advances on the next turn, the count restarts, even if the board soon looks much the same.
Rules and examples
FIDE Laws of Chess, Articles 9.3 and 9.6.2, set the claim and automatic-draw thresholds.
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.
Read the rulesA move on the board
7k/8/8/8/8/8/8/R3K3 w - - 99 51
7k/8/8/8/8/8/R7/4K3 b - - 100 51
- Ra2The halfmove counter reaches 100: fifty moves by each side without a pawn move or capture.
The halfmove counter reaches 100: fifty moves by each side without a pawn move or capture.
Original teaching example replayed with python-chess 1.11.2, 2026-10-23.
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.