# Questions tagged [50-move-rule]

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### Why is there a 50-move rule and a 75-move rule?

By number theory, if the 75-move rule has been reached, the 50-move rule will also be reached. This has no meaning. It is like saying "I would buy this book if it cost under \$60 and it costs under \$40"...
1k views

### Why was 50 chosen for the 50-move rule?

The reason for the 50-move rule, along with the triple-repetition rule is to make chess definitely finite. How did one arrive at the number 50? What would change if it was 40 or 60? Is the number 50 ...
2k views

### Are there endgames which could be forced wins if not for the 50-move rule?

Wikipedia's article on the fifty-move rule states: In the 20th century it was discovered that some positions of certain endgames can only be won in more than fifty moves (without a capture or a ...
242k views

### With only a king left, how many moves remaining until a draw?

I am a beginner in chess. If I have only a king left, how many moves does my opponent have to mate me?
2k views

### 50-move rule: only the last 50 or any consecutive 50?

Suppose that, as a result of White's move, there have now been 100 single-moves (50 full moves) since the most recent pawn move or capture. White didn't claim a draw because they're going for the win. ...
2k views

### Identify a problem where a potentially winning move draws because of the 50 move rule

I'm trying to recall a particular chess problem. It's related to retrograde analysis. All what I can remember is this: it's an endgame where there is only one way to reach the position, and during ...
921 views

### I'm confused about the 50-move rule

A player may claim a draw after 50 moves-does this mean 25 moves by each player, which results 50, or 50 moves by each player, which results 100?
1k views

### Proof of irreversibility of 50 move rule

I recently edited the Wikipedia article 50 Move Rule as follows: The rationale for this rule is that pawn moves and captures are the only '''irreversible''' types of moves. That is, after ...
809 views

### What is the order of actions in chess under FIDE rules?

Reading some recent posts about the 50 move rule made me realize that I've never seen an explicit order of actions for chess. By way of comparison, the order of actions in Monopoly is given here: (1) ...
664 views

### Why doesn't castling reset 50 moves rule?

Capturing a piece or moving a pawn irreversibly changes the state of the game and thus resets the counter for 50-moves rule. Since castling irreversible changes the state of the game too, it seems to ...
2k views

### Is it OK to look at the list of played moves during the game to determine the status of the 50 move rule?

There are some positions in which you need to know how many moves have been played without pawn move or capture. For example: [FEN "1R5K/8/8/8/8/8/7R/k7 w - - 98 1000"] (1R5K/8/8/8/8/8/7R/k7 w - - ...
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### Is the 50-move rule ever used in grandmaster games?

The 50-move rule states that if no capture or pawn move occurs for 50 consecutive moves, then either player may claim a draw. It seems like the 50-move rule is never truly necessary to determine that ...
846 views

### Does checkmate over ride 50 move violation?

If a move creates the 50 move violation and at the same time creates checkmate, does the checkmate take priority over the draw ?
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### Has the 50 move rule been used in serious games?

There are a lot of questions about the 50-move rule; details on how to claim the draw, why the number 50, etc... But the most interesting question seems to be whether the rule has ever been applied ...
420 views

### What's the maximum number of moves that can result in a threefold repetition from an arbitrary position?

Assume that the fifty-move rule does not require a player to claim a draw. Instead, the game is automatically declared a draw if no pawns have been moved and no pieces have been captured in the last ...
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### 50-move rule: FIDE wording seems weird

FIDE rules seem to say that I have to claim draw (3-repetition and 50-move) before I actually touch/move my piece. And if I move my piece first, and then claim the draw, it doesn't count. 1) Is this ...
592 views

### Simltaneous checkmate and draw claim on the 50th move [duplicate]

This question is for aspiring rules lawyers. The FIDE's new laws of chess, effective Jan. 1, 2018, patch ambiguities and other subtle problems. I like the new laws. When it comes to game mechanics, I ...
876 views

### Of all the possible legal chess games, how many end in white win, draw and black win (assuming 50 move rule)?

If both sides make moves completely randomly but legally, how many different games are there? Since the 50 move rule applies, this number should be finite (but HUGE). For example, there are 20 ...
251 views

### Chess endgame database+50-move rule=potential error?

Are there any examples of positions where usage of the endgame tablebase gives an incorrect evaluation, due to the ignoring of the 50-move rule? At the moment I am not sure if endgame tablebases ...
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### What are the hardest pawnless endgames that go over the 50-move rule?

I know two pawnless endgames that go over the 50-move rule. King and 2 Bishops vs. King and Knight = 70 moves average. King, Rook and Bishop vs. King and 2 Knights = 200 move average. What others ...
541 views

### How do UCI chess engines handle the 50-move or threefold repetition rules when playing against other engines?

I'm working on an engine that implements the UCI protocol that is intended to play against other engines. Since the UCI protocol has no commands for offering or accepting draws, how does this work ...
669 views

### The 50 Move Rule

Can the fifty move counter be increased after white's move? I thought that it could only be increased if both white and then black had not moved a pawn nor captured a piece that qualified for a whole ...
242 views

### Does anyone have a version of the 50x50 article by Nikita Plaksin?

In 1979, Nikita M. Plaksin published a reportedly fascinating article containing 50 problems all related to the 50 moves rule. Unfortunately I can't find it anywhere, the only links that I could find ...
305 views

### Is a forced draw by 50 moves possible with Bishop and Knight endgame?

Except for the variations where there is a capture or fork possible for the defending side, is a position possible where this kind of endgame will last more than 50 moves? Is somewhere a calculation ...
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### How long can a player hold off a draw by the 50-move rule?

Going by rules strictly about the board state, how long can a player theoretically hold off a draw by the 50-move rule? White will play as long as possible, and not want to lose. Black will claim a ...
228 views

### What is the longest tablebase win that includes draw rules?

It has been asked the longest mate that includes draw rules is, and it is known what the longest tablebase mate is. However, what is the longest tablebase mate, i.e. 7 pieces or less, that accounts ...
140 views

### Claiming a 50-move draw with a mating move [duplicate]

Under FIDE law 9.3.1, a player to move may claim a 50-move draw by writing down the intended 50th move and making the claim. Supposing this claim is otherwise valid; if the move would checkmate then ...
1k views

### What is the source of the house-rule 18-moves?

In my area, most kids including me grew up with a very popular house-rule: After all the pieces of either of the players are removed besides the king, the opposing player has 18 moves to checkmate him....