The position has to be repeated 3 times with the same person to move. It usually occurs in a row but CAN happen when you make different moves a few times then come back to the same position etc...
The key is to remember the position when it's your move and then later on it has to be your move again with the same position, and then repeat once more and it's a draw. What you and your opponent do in between matters not, only that when it's your move it's the same position. (Or remember the position when it's his move and the repeat it, but you get the drift.)
By The Way, I don't think RHP recognizes a draw by repitition. It's been discussed but not implemented.
In my opinion this is a serious shortcoming of the site. Games of chess played here should follow the same rules as games of chess played over the board-- but where draws are concerned, they don't.
This is a flaw that can have a material impact on the results of games.
I hope fixing it is high on the priority list.
regarding difficulty of implementation: shouldn't think it that hard. The game history already logs all moves, so the software need only check this history (a checksum comparison?) for the number of identical positions since the last piece was taken (max. 50 moves, as otherwise a draw would result anyway).
Originally posted by ChessNutThere is one slight adjustment to what you say, it does matter what you or your opponent do between the positions being repeated because all move options have to be the same. For example with a king on e1 and a rook on h1 castling is possible, if king or rook are moved and returned to their original squares the position is the same but it is not a draw because the option to castle has been lost, now i'm confused.........
The position has to be repeated 3 times with the same person to move. It usually occurs in a row but CAN happen when you make different moves a few times then come back to the same position etc...
The key is to remember the position wh ...[text shortened]... s a draw by repitition. It's been discussed but not implemented.
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Originally posted by Alley Crimeintersesting! I've no idea what the ruling is there. That's 'cos I aint much of a chess player: I imagine the real chess folk here would know. Also concider if two rooks (or knights) had swapped places: are the pieces considered to be different, and thus the board to be non-identical? I wouldn't think so, but who am I to say?
There is one slight adjustment to what you say, it does matter what you or your opponent do between the positions being repeated because all move options have to be the same. For example with a king on e1 and a rook on h1 castling is possible, if king or rook are moved and returned to their original squares the position is the same but it is not a draw because the option to castle has been lost, now i'm confused.........
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