I am looking for positions from where every move is forced up to a certain depth. If the original position (or one in between) occurs again, the sequence is finished there.
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Do you mean that every move of both players is forced or of just one player? (In the first case, mates in N moves are out of the question, because the moves of the losing side are not forced as his decision makes no difference.) – JiK Apr 3 '14 at 13:41
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Yes, it's about forced sequences for both players. It doesn't need to end in checkmate, the only requirement is that there is just one possible move for each player for a long time. – chaosflaws Apr 3 '14 at 16:00
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1I think it eas not intended by the one asking the other question but it is trivial to construct a position that is forced to repeat again and again, making that sequence infinite. – chaosflaws Apr 3 '14 at 20:49
9 moves
In the linked thread (not quite a duplicate), a valid answer is posed to this question:
You mean like this?
[FEN "K1k5/P1Pp4/p2P4/Pp6/P1p5/2P5/8/8 - - - 0 0 "]
1. axb5 axb5 a6 b4 cxb4 c3 b5 c2 b6 c1=Q b7# 1-0
White mates in 6.
I guess that's 9 consecutive forced moves. It would be eleven except for black's choice of promotion piece on his fifth move. I don't know if it's a record, and I don't know who composed this classic chess problem.
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I miss understood what the OP was asking, I end up deleting my answer and upvoting yours since it goes straight to the point. – dreamcrash May 21 '14 at 13:43
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1@Alan It's not counted in the 9 half-moves for that reason. ("It would be eleven except for black's choice of promotion..."). – Daniel♦ Jun 12 '14 at 10:32
