an ordinary chessplayer wrote on 08/14/23 at 12:45:20:
I think the definition of hanging pawns also includes that the isolated couple are on semi-open files. Wasn't that how Nimzowitsch gave it? (My books are in storage at the moment.)
If that's the case, the search criteria should also specify six black pawns on files a to b and e to h.
I agree. I would start by doing a search for what is probably the most common white Hanging Pawns position by placing white pawns in the search mask at a2, c4, d4, f2, g2, h2 and black pawns at a7, b6, e6, f7, g7 and h7;
then on the Exclude board I would place white pawns at b2, b3, b4, b5, e2,e3,e4,e5 and black pawns at c5, c6, c7, d5,d6,d7.
Then I would click OK and then view the results.
Terminology:
Many sources make no distinction between e.g. white pawns "hanging" at c4/d4 and c3/d4.
Others, starting I think with Nimzowitsch, make a distinction, referring to the pawns at c3/d4 as an "Isolated Pawn Couple" and reserving the term "Hanging Pawns" for pawns at c4/d4.
Some time ago I bookmarked these two links, which might be useful:
https://www.chessmasterschool.com/clients/mainfiles/07a87534jfk/theory/isolatedp... and
https://www.chessmasterschool.com/clients/mainfiles/07a87534jfk/theory/hangingpa...