A. A. Troitzky
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Alexei Alexeyevich Troitzky (or Troitsky) (March 14, 1866 - August 1942) is considered to have been one of the greatest composers of chess endgame studies. He died of starvation during World War II at the siege of Leningrad, where his notes were destroyed.
One of his most famous works involves analyzing the endgame with two knights versus a pawn - see the section endings with no pawns at endgame and Troitzky line.