s . ▁He ▁was ▁U . S . ▁Open ▁Champion ▁in ▁ 1 9 3 6 , ▁ 1 9 3 8 , ▁and ▁ 1 9 4 3 . ▁In ▁ 1 9 4 1 , ▁he ▁lost ▁a ▁match ▁(+ 0 − 3 = 1 3 ) ▁with ▁Samuel ▁Res he v sky ▁for ▁the ▁U . S . ▁Ch ess ▁Championship . ▁He ▁played ▁on ▁the ▁U . S . ▁Team ▁in ▁four ▁Ch ess ▁Olymp i ads , ▁in ▁ 1 9 3 1 , ▁ 1 9 3 5 , ▁ 1 9 3 7 , ▁and ▁ 1 9 5 0 ; ▁the ▁first ▁three ▁of ▁which ▁were ▁won ▁by ▁the ▁U . S . ▁In ▁a ▁famous ▁USA ▁vs . ▁USS R ▁radio ▁ch ess ▁match ▁ 1 9 4 5 , ▁Hor ow itz ▁scored ▁one ▁of ▁the ▁only ▁two ▁wins ▁for ▁the ▁U . S . ▁by ▁defe ating ▁G M ▁Sal o ▁Flo hr . ▁He ▁split ▁his ▁" min i - match " ▁of ▁two ▁games ▁against ▁Flo hr , ▁and ▁in ▁the ▁ 1 9 4 6 ▁edition ▁of ▁the ▁same ▁event , ▁split ▁his ▁mini - match ▁against ▁Isaac ▁B oles lav sky . ▁ ▁Hor ow itz ▁Def ense ▁ ▁In ▁his ▁book ▁Modern ▁Ide as ▁In ▁The ▁Ch ess ▁Open ings , ▁Hor ow itz ▁proposed ▁a ▁defense ▁against ▁the ▁Dan ish ▁G amb it ▁( 1 . e 4 ▁e 5 ▁ 2 . d 4 ▁ex