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Old August 27th 17, 05:31 AM posted to,
Marc Moisan
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Posts: 1
Default Engine puzzle position

On 2017-07-22 04:46, Rainer wrote:

NB: there is a decades-old controversy whether it's ok to return a draw
score after the first position repetition, or if this should be done
only after the second repetition. One can argue either way, I'll let
that aside.

The relevant rule in the FIDE laws of chess is 9.2, which reads:

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 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 appeared, and the player claiming the draw has the move.

In other words the position ought to occur (about to or just did) for
the third time, but in addition must also be so claimed by the player
having the move. It is not an automatic draw (although most programs
make it an automatic draw).


Marc Moisan, CD, PLog