The 50-Move Rule
The clock that ticks under every long endgame
If 50 consecutive moves are played by each side without any pawn move and without any capture, the game can be claimed as a draw. It exists to stop endless shuffling, and it quietly changes which endgames are actually winnable.
Play this ending (free)How the rule works
A player may claim a draw if the last 50 consecutive moves by each side contain no capture and no pawn move. Any capture or any pawn move resets the counter to zero. The claim is made by the player on move; it is not automatic at 50.
Since 2014, FIDE also has an automatic backstop: at 75 such moves (Article 9.6.2), the arbiter declares the game drawn even if nobody claims. Online, sites typically apply the 50-move draw automatically.
Why 50, and where it bites
Fifty moves is enough for every classical textbook win: king and queen mate takes at most 10 moves, king and rook at most 16, two bishops about 19, and even the notorious bishop and knight mate at most 33. Play any of them accurately and the rule never matters.
It bites in two places. First, in practice: a player who doesn't know the technique burns 20 moves going nowhere, and the defender's draw claim becomes a real threat; defenders absolutely do count. Second, in theory: computer tablebases have found positions (famously some 7-piece endings) that are “won” only with sequences of hundreds of captureless moves, wins that the 50-move rule converts into draws in real play.
Tablebases and the DTZ50 metric
Modern Syzygy tablebases account for the rule directly with DTZ (distance to zeroing), the number of moves until a capture or pawn move resets the counter. A position is only a real win if it can be converted within the 50-move budget at every stage; positions winnable only by ignoring the rule are labeled “cursed wins.”
This is exactly how the opponent works when you practice here: it plays the DTZ50-perfect move, meaning it defends with the 50-move rule as a weapon. If your technique is too slow, it will not blunder to bail you out: the same standard a stubborn human defender holds you to.
Questions
Is the 50-move rule automatic?
Over the board, no: a player must claim the draw at 50 moves. FIDE rules do end the game automatically at 75 moves without a capture or pawn move. Most online platforms apply the 50-move draw automatically.
What is the difference between the 50-move rule and the 75-move rule?
The 50-move draw must be claimed by one of the players. The 75-move rule (FIDE Article 9.6.2) is the automatic backstop: at 75 moves by each side without a capture or pawn move, the game is drawn by rule, no claim needed.
What resets the 50-move counter?
Any capture or any pawn move by either player resets the counter to zero. Checks, castling, and ordinary piece moves do not reset it.
Can you checkmate with bishop and knight within 50 moves?
Yes. From any winning position, king, bishop and knight can force mate in at most 33 moves with correct play. The 50-move rule only becomes a problem if the attacker doesn't know the technique.
Are there endgames that need more than 50 moves to win?
Yes: tablebases have proved that some positions (for example certain 7-piece endings) require far more than 50 captureless moves to convert. Under the 50-move rule those positions are draws in practical play.
Don't just read it, play it
Every position below is playable right now, free, no signup, against a tablebase-perfect opponent that never gives up and explains every mistake.
Follow the full curriculum (free)or sharpen these endings in the Gym