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Subject: Re: Gambit Tiger 2.0: 6 seconds on K6-2 450

Author: Christophe Theron

Date: 09:43:56 04/27/01

Go up one level in this thread


On April 27, 2001 at 02:44:13, Uri Blass wrote:

>On April 26, 2001 at 19:09:02, Christophe Theron wrote:
>
>>On April 26, 2001 at 16:19:10, Peter Berger wrote:
>>
>>>On April 26, 2001 at 15:29:16, Christophe Theron wrote:
>>>
>>>>On April 25, 2001 at 17:31:10, Peter Berger wrote:
>>>>>It's similar when it is about proper implementation of draw rules btw . Offering
>>>>>draws is only allowed when you have showed your move ; claiming draw by
>>>>>repetition or 50 moves rule - this should be done by claiming draw saying : " I
>>>>>reach draw by playing blablabla . " - no program does this properly .
>>>>
>>>>
>>>>
>>>>As far as I know you can claim a draw by repetition or 50 moves rules either
>>>>before or after you move.
>>>>
>>>>As soon as the condition for the draw is met, you can claim it. The condition
>>>>can be met before you move, so you can claim a draw before you move.
>>>>
>>>>
>>>>
>>>>    Christophe
>>>
>>>OK ; let's get nerdish :
>>>
>>>Article 9: The drawn game
>>>
>>>9.1 A player can propose a draw after making a move on the chessboard. He must
>>>do so before stopping his own clock and starting his opponent's clock. An offer
>>>at any other time during play is still valid, but Article 12.5 must be
>>>considered. No conditions can be attached to the offer. In both cases the offer
>>>cannot be withdrawn and remains valid until the opponent accepts it, rejects it
>>>orally, rejects it by making a move, or the game is concluded in some other way.
>>>
>>>The offer of a draw shall be noted by each player on his scoresheet with the
>>>symbol (=).
>>>
>>>9.2 The game is drawn, upon a correct claim by the player having the move, when
>>>the same position, for at least the third time (not necessarily by repetition of
>>>moves)
>>>
>>>is about to appear, if he first writes his move on his scoresheet and declares
>>>to the arbiter his intention to make this move, or
>>>has just appeared.
>>>Positions as in (a) and (b) are considered the same, if the same player has the
>>>move, pieces of the same kind and colour occupy the same squares, and the
>>>possible moves of all the pieces of both players are the same.
>>>Positions are not the same if a pawn could have been captured en passant or if
>>>the right to castle immediately or in the future has been changed.
>>>
>>>
>>>9.3 The game is drawn, upon a correct claim by the player having the move, if
>>>
>>>he writes on his scoresheet, and declares to the arbiter his intention to make a
>>>move which shall result in the last 50 moves having been made by each player
>>>without the movement of any pawn and without the capture of any piece, or
>>>the last 50 consecutive moves have been made by each player without the movement
>>>of any pawn and without the capture of any piece.
>>>
>>>
>>>9.4 If the player makes a move without having claimed the draw he loses the
>>>right to claim, as in Article 9.2 or 9.3, on that move .
>>>
>>>9.5 If a player claims a draw as in Article 9.2 or 9.3 he shall immediately stop
>>>both clocks. He is not allowed to withdraw his claim.
>>>
>>>If the claim is found to be correct the game is immediately drawn.
>>>If the claim is found to be incorrect, the arbiter shall deduct half of the
>>>claimant's remaining time up to a maximum of three minutes and add three minutes
>>>to the opponent's remaining time. Then the game shall continue and the intended
>>>move must be made.
>>>
>>>9.6 The game is drawn when a position is reached from which a checkmate cannot
>>>occur by any possible series of legal moves, even with the most unskilled play.
>>>This immediately ends the game.
>>>
>>>
>>>You are right - repeating the rules of chess is still useful though I think .
>>>There is a proper way of doing it ( the one I mentioned ) ; there are also some
>>>exceptions which are tolerated ( like the ones you mentioned ) and then there
>>>are the things which are simply not considered OK ( like the way all commercial
>>>programs who are able to offer draw except Gandalf do it ) .
>>
>>
>>
>>Well... I remember that I had to deal with this discussion already. At that time
>>I had read the rules again and concluded that the way computers do it was OK.
>>
>>Maybe I did not have the same rules as you (?!).
>>
>>Anyway, in case of a draw by repetition, if the game is drawn by repetition by
>>the last move of the opponent, then I can ALWAYS make another move that will
>>also be a draw by repetition.
>
>No you cannot always do it.
>Example:
>
>[D]rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
>after 1.Nf3 Nf6 2.Ng1 Ng8 3.Nh3 Nf6 4.Ng1 Ng8 the position is a draw by third
>repetition but you cannot make a move in order to get third repetition after
>your move.
>
>Uri



Argh... That's right.

Then all chess programs do it wrong !?



     Christophe



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