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For questions about the threefold repetition rule, which states a player can claim a draw if it's his/her move and a position has appeared / is about to appear which happened before at least twice.

5
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3answers
178 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 ...
2
votes
3answers
167 views

Does threefold repetition take into account the side to move?

To be more clear, here is a fragment of a game: [FEN "4k3/R7/6r1/3KP3/8/8/8/8 w - - 0 1"] 1. Ra2 Rg5 2. Ra7 Rg6 3. Ra2 Rg5 4. Ra7 Rg6 5. Ra4 Rg5 6. Ra2 From the FIDE Laws of Chess: 5.5.1 d. ...
5
votes
1answer
120 views

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 ...
8
votes
1answer
668 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) ...
5
votes
1answer
270 views

Three-fold repetition and null move

Added transposition table (this was tested alone and worked as expected), three fold repetition and null move pruning in my engine and wins more games but some of them end with three fold repetition ...
4
votes
4answers
2k views

Programming the Three-fold repetition for my chess engine

I'm making a chess engine that has to implement a three-fold repetition as my AI vs AI engine repeats the same moves over and over again (Have a look at my post here - My chess AI makes the same ...
5
votes
2answers
110 views

Najdorf threefold repition

In the Sicilian Najdorf there is a well known line which ends in threefold repition (if both players want). [Event "NN"] [ECO "B90"] [Opening "Sicilian Defense: Najdorf Variation, English Attack, ...
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2answers
194 views

How did this game end in a draw?

https://en.lichess.org/B6L5XNox Never mind the sloppy play. I'm just curious why this ended in a draw: (Does anyone know how to copy moves from lichess?) Anyway, the final 5 moves: Rc4+ Kb6 Qd8+ ...
2
votes
1answer
397 views

Threefold repetition: Am I getting it right?

I was wondering if this is the right way of how the threefold repetition works. Thanks. (The image is in gif format, it should play automatically.)
5
votes
2answers
178 views

Why is this a threefold repetition draw?

I'm relatively new, so sorry if this is obvious. Recently played a game on my phone chess app where the option popped up that I could claim a threefold repetition draw. I hadn't known about this rule. ...
5
votes
2answers
173 views

How can I find chess games from grand masters that end in threefold repetition?

When I go to http://www.chessgames.com/, I can search for matches that end in draws, however I can not figure out how to filter those draws to specifically threefold repetition. How can I find these ...