Then at the Trebitsch Memorial, Vienna 1928, Kmoch shared 3rd–6th places with 6/10, half a point behind Gruenfeld and Sandor Takacs.

His Die Kunst der Verteidigung (The Art of Defence) was the first chess book devoted to this subject.

In 1930, Kmoch updated the Bilguier openings handbook, and wrote the tournament book for the Carlsbad 1929 event.

After World War II ended, Kmoch and his wife moved to the United States, settling in New York City.

In 1956, he wrote his most famous book, Pawn Power in Chess (German: Die Kunst der Bauernführung), which is notorious for its use of neologisms ("ram", "lever", "sweeper", "sealer", "quartgrip", "monochromy", etc.).