Technical reason why probing N-men syzygy will also probe N-1 men?

[Sven]

In a recent thread I asked why, and got the answer that Ronald, author of the Syzygy endgame tablebases, gave this explanation:

The N-1-men will be probed while the N-men are getting probed because of how the compression scheme works.

Does anyone know the technical details about it? My naive way of thinking tells me that "probing" an endgame tablebase means roughly

1) determining the TB file containing the value of the position,
2) calculating where in that file the needed information is stored ("index"),
3) reading the stored value.

[petero2]

In a recent thread I asked why, and got the answer that Ronald, author of the Syzygy endgame tablebases, gave this explanation:

The N-1-men will be probed while the N-men are getting probed because of how the compression scheme works.

Does anyone know the technical details about it?

It is explained here: viewtopic.php?t=47681#p513651

[Sven]

In a recent thread I asked why, and got the answer that Ronald, author of the Syzygy endgame tablebases, gave this explanation:

The N-1-men will be probed while the N-men are getting probed because of how the compression scheme works.

Does anyone know the technical details about it?

It is explained here: viewtopic.php?t=47681#p513651

Thanks a lot!