user2715: 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.

user86: 9 moves
In the linked thread (not quite a duplicate), a valid answer is posed to this question:

You mean like this?

[Title "Vilhelm Röpke, Skakbladet 1942, Mate In 6"]
[FEN "K1k5/P1Pp4/1p1P4/8/p7/P2P4/8/8 w - - 0 1"]


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.


2715: <p>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.</p>
 86: <h2>9 moves</h2>
<p>In <a href="https://chess.stackexchange.com/q/4963/86">the linked thread</a> (not quite a duplicate), a valid <a href="https://chess.stackexchange.com/a/4965/86">answer</a> is posed to this question:</p>
<blockquote>
<p>You mean like this?</p>
</blockquote>
<pre><code>[Title &quot;Vilhelm Röpke, Skakbladet 1942, Mate In 6&quot;]
[FEN &quot;K1k5/P1Pp4/1p1P4/8/p7/P2P4/8/8 w - - 0 1&quot;]
</code></pre>
<blockquote>
<p>White mates in 6.</p>
</blockquote>
<blockquote>
<p>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.</p>
</blockquote>
