Carel Christiaan Wilhelm Mann (born July 23, 1871 in Amsterdam; † died on November 30, 1928 in The Hague) was the first Dutch chess composer of international importance.

He was a well known chess composer of chess problems and many endgame studies

After graduating from school, he worked as a butcher in his father's butcher shop. He initially played tournament chess passably, and in 1892 he began composing chess problems and endgame studies. Some of his studies became internationally known and won prizes.

Many of his famous endgame studies showed two queens and a few pieces, and he liked to work on subjects that were subject to tension.

173 endgame studies and 62 chess problems were published.

Mann suffered from a nervous disorder since his youth. This increased noticeably from 1911 onwards and ultimately led to his death in 1928.

Literature
Jan van Reek and Henk van Donk: Carel Mann. Alexander Rueb Association for Schaakeindspelstudie, Margraten 1991. ISBN 90-72939-06-9
Jan van Reek and Henk van Donk: History of endgame study composing in the Netherlands and Flanders. Alexander Rueb Association for Schaakeindspelstudie, Margraten 1992. ISBN 90-72939-12-3

Source: Germain Wikipedia

Others: 4 endgame studies composed by Mann are selected on Website arves.org (editor Peter Boll)

              2 chess games against N Van Lennep can be replayed on the website chessgames.com. In both games N Van Lennep had the white pieces and Carel Mann lost both games.

On Website pdb.dieschwalbe.de 22 chess problems by Carel Mann are shown. 

In addition to endgame studies, Carel Mann also composed a series of fine orthodox chess problems. Mostly with sparse material.

Very well-known chess problem (White moves and mates in 4 moves) with 6 pieces

One of his chess problem (Kg3/Kg5)  with only one white queen became very well known.  Black has only 3 pawns. White: Kg3, Qh1 Black: Kg5, g4, g6, f6. White to move and mate in 4 moves. Solution: 1.Qa8 2.Qh8+ 3.Qh1 zz 4.Q#

In the solution, the white queen makes the longest moves and then returns to the starting square h1. After that Black is forced to move (Zugzwang).  It has been republished many times in chess corners and chess magazines.