Selection of studies composed by
Walter Bähr
(Germany, 1905 - 1986).
Not very much is known about this composer.
Also these birthyear and year of death are uncertain.
In 1936 he wrote a book:
"Opposition und kritische felder im bauernendspiel;
eine schachtheoretischer abhandlung auf neuer grundlage für turnierspieler und endspielfreunde"
He mainly composed endgame studies with only pawns
and also 12 problems of him can be found at the Problem Database of Die Schwalbe.
His rule about when a position in a pawn ending with 2 against one pawn with two pawns at the a- or h-file is famous.
Look for explanations on these websites:
http://amateur-chess.blogspot.nl/2013/03/bahrs-rule-in-king-and-pawn-endgame.html
http://likesforests.blogspot.nl/2007/08/rook-pawns-outside-pawn-ii.html
https://gameknot.com/club-fm.pl?club=791&th=10233
At German Wikipedia there is some information about him.
Also this website academic.com has some information.
Because he lived in Gottenheim and played for the Freiburg Chessclub, he possibly was this person:
(All his studies, more exact dates, possible corrections or cooks and exact details about sources can be found in the
Harold van der Heijden database V (31-12-2015) ).