Author: Robert Hyatt
Date: 13:40:21 07/12/02
Go up one level in this thread
On July 12, 2002 at 09:52:03, Ricardo Gibert wrote: >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? This is one most chess programs probably get wrong. the EP capture is not possible, so that the position is the same whether white had just played e2-e4 or e3-e4, since they are equivalent with the black pawn pinned. Therefore this would be a repetition if the same position happens two more times by shuffling kings.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.