Author: Ricardo Gibert
Date: 06:52:03 07/12/02
Go up one level in this thread
On July 12, 2002 at 09:27:43, José Carlos wrote: >On July 12, 2002 at 09:19:10, Richard Pijl wrote: > >><snipped irrelevant part> >> >>>>>>- Game history should be counted, but make sure you do not evaluate repetitions >>>>>>in the rootnode as you need a move to be played ... >>>>> >>>>> Not if your opponent has made a move such that there's a 3 times repeated >>>>>position on the board. In that case, you can simply claim the draw. >>>>> >>>>Not by FIDE rules where you have to state a move you want to play which results >>>>in the third time the position occurred. E.g. when from the startposition white >>>>moves its kings knight to f3 and back, and black does the same with its knight >>>>(g8-f6 and back) black can claim a draw before making its fourth move stating >>>>the intention to play f6-g8. If black doesn't, white can by stating the move >>>>g1-f3. However, if white had played the sequence 1.Nf3 2.Ng1 3.Nc3 4.Nb1 it >>>>cannot claim a draw on any move as on either Nc3 or Nf3 the position only >>>>occurred twice. >>> >>> I play white, you play black. The game goes: 1. Nf3 Nf6 2. Ng1 Ng8 3. Nf3 Nf6 >>>4. Ng1 Ng8 5. Nf3 Nf6 6. Ng1 Ng8 7. Nf3 Nf6 ... It's perfectly legal because 3rd >>>repetition must be claimed by the players. In this game, either you or me can >>>claim draw by third repetition whenever we want, with or without making a move, >>>because there have been some positions (4 in this case) repeated 3 or more >>>times. >>> I'm 100% sure about this point. >>> >>You're right. Either something changed in the rules over time or my memory is >>failing me ;-). From the FIDE rules: >> >>'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 (no necessarily by sequential >>repetition of moves) >>a) 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 >>b) has just appeard, and the player claiming the draw has the move. >> >>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 that could have been captured en passant >>can no longer be captured or if the right to castle has been changed temporarily >>or permanently.' >> >>(From FIDE Laws of Chess, in force since July 1st 2001) >> >>Richard > > Thanks for the info. > Luckily I don't have a bug in third repetition then :) > > José C. How should this next position be handled? [D]8/6k1/1b6/2p5/3pP3/3P4/1B4K1/8 b - e3 0 1 White has just played e2e4 and the reply de3 e.p. is not a legal move. Should this position recur, is it counted as a repetition since the same set of legal moves for Black are available? Either way, do programs handle this case corrrectly?
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