<prompt> Qedela umusho olandelayo: UHorowitz wayengumdlali ovelele e-U.S. phakathi nawo-1930 nawo-1940. WayenguMpetha wase-U.S. Open ngo-1936, 1938 no-1943. Ngo-1941, walahlekelwa umdlalo 0313 noSamuel Reshevsky we-US Chess Championship. Wayedlala eqenjini lase-U.S. Emidlalweni ye-Olympic ye-Chess emine,  <response>: Ngo-1931, 1935, 1937, no-1950; ezintathu zokuqala zazo zanqotshwa yi-U.S. Emdlalweni odumile we-USA vs. USSR womsakazo we-chess ngo-1945, uHorowitz wathola enye yezinqola ezimbili kuphela e-U.S. ngokunqoba i-GM Salo Flohr. Wahlukanisa umdlalo omncane wakhe wemidlalo emibili ngokumelene noFlohr, futhi ngo-1946 edition yomcimbi ofanayo, wahlukanisa umdlalo wakhe omncane ngokumelene no-Isaac Boleslavsky. 