| New York 1926 (6) |
Manhattan Club Championship |
9 | / | 14 |
| | | |
| New York 1927 (3) |
Manhattan Club Championship |
9 | / | 14 |
| | | |
| New York 1928 (2) |
Manhattan Club Championship |
4.5 | / | 8 |
| | | |
| Bradley Beach 1928 |
Bradley Beach Tournament |
4.5 | / | 7 |
| | | |
| New York 1928 (6) |
Manhattan Junior Masters Tournament |
3.5 | / | 6 |
| | | |
| New York 1929 (4) |
Manhattan Club - City College Club Match |
| | | | | | |
|
Horowitz, I.A. - Kussman, A.S. |
0.5 - 0.5 |
| | | |
| New York 1930 (4) |
Manhattan Club - Hungarian Club Match |
| | | | | | |
|
Horowitz, I.A. - Berman, E. |
0.5 - 0.5 |
| | | |
| New York 1930 (6) |
Manhattan Club - Columbia University Club Match |
| | | | | | |
|
Horowitz, I.A. - Halper, N. |
0.5 - 0.5 |
| | | |
| New York 1930 (7) |
Manhattan Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Cass, A.C. |
1 - 0 |
| | | |
| New York 1930 (8) |
Manhattan Club Championship |
6 | / | 10 |
| | | |
| New York 1931 (2) |
Philadelphia - Manhattan Club Match |
| | | | | | |
|
Horowitz, I.A. - Sharp, S.T. |
0.5 - 0.5 |
| | | |
| New York 1931 (7) |
Marshall Club - Manhattan Club Match |
| | | | | | |
|
Horowitz, I.A. - Dake, A.W. |
0 - 1 |
| | | |
| New York 1931 (8) |
Manhattan Club - Empire City Club Match |
| | | | | | |
|
Horowitz, I.A. - Simchow, A. |
0.5 - 0.5 |
| | | |
| New York 1931 (10) |
New York International Tournament |
5.5 | / | 11 |
| | | |
| Prague 1931 (5) |
4th Olympiad |
9 | / | 13 |
| | | |
| New York 1932 (10) |
Manhattan Club - Hungarian International Club Match |
| | | | | | |
|
Horowitz, I.A. - Peckover, J.E. |
1 - 0 |
| | | |
| New York 1933 (2) |
Manhattan Club Championship |
6.5 | / | 10 |
| | | |
| Philadelphia 1933 |
Manhattan Club - Philadelphia Match |
| | | | | | |
|
Horowitz, I.A. - Winkelman, B.F. |
1 - 0 |
| | | |
| New York 1933 (12) |
Marshall Club - Manhattan Club Match |
| | | | | | |
|
Horowitz, I.A. - Santasiere, A.E. |
0 - 1 |
| | | |
| New York 1933 (13) |
U.S. Olympic Team Trial Tournament |
5.5 | / | 10 |
| | | |
| New York 1933 (15) |
Manhattan Club - Empire City Club Match |
| | | | | | |
|
Horowitz, I.A. - Simchow, A. |
0 - 1 |
| | | |
| Syracuse 1934 (1) |
Syracuse International Tournament |
8.5 | / | 14 |
| | | |
| New York 1934 (1) |
Manhattan Club Championship |
9.5 | / | 13 |
| | | |
| New York 1934 (3) |
Manhattan Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Reinfeld, F. |
0.5 - 0.5 |
| | | |
| New York 1935 (1) |
Manhattan Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Reshevsky, S.H. |
0 - 1 |
| | | |
| Philadelphia 1935 |
Manhattan Club - Mercantile Library Club Match |
| | | | | | |
|
Horowitz, I.A. - Glover, E.R. |
1 - 0 |
| | | |
| Warsaw 1935 (2) |
6th Olympiad |
12 | / | 15 |
| | | |
| New York 1936 (4) |
Manhattan Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Dake, A.W. |
1 - 0 |
| | | |
| New York 1936 (9) |
U.S. Championship - Final |
7 | / | 15 |
| | | |
| Philadelphia 1936 (4) |
37th American Chess Federation Congress - Preliminary 4 |
10 | / | 12 |
| | | |
| Philadelphia 1936 (5) |
37th American Chess Federation Congress - Championship |
8 | / | 11 |
| | | |
| New York 1937 (2) |
Manhattan Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Hanauer, M.L. |
0.5 - 0.5 |
| | | |
| New York 1937 (3) |
Philadelphia - Manhattan Club Match |
| | | | | | |
|
Horowitz, I.A. - Regen, A. |
1 - 0 |
| | | |
| Stockholm 1937 (3) |
7th Olympiad |
13 | / | 15 |
| | | |
| New York 1938 (2) |
Manhattann Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Reshevsky, S.H. |
0 - 1 |
| | | |
| New York 1938 (3) |
2nd USA Championship - Final |
10 | / | 16 |
| | | |
| New York 1938 (8) |
Manhattan Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Fine, R. |
0 - 1 |
| | | |
| Boston, Massachusetts 1938 (2) |
39th American Chess Federation Congress - Preliminary Section 2 |
5.5 | / | 6 |
| | | |
| Boston, Massachusetts 1938 (7) |
39th American Chess Federation Congress - Championship Final |
9 | / | 11 |
| | | |
| New York 1939 (1) |
Manhattan Club - Rice Progressive Club Match |
| | | | | | |
|
Horowitz, I.A. - Lazinsky |
1 - 0 |
| | | |
| New York 1939 (3) |
Manhattan Club - Marshall Club Match |
| | | | | | |
|
Horowitz, I.A. - Hanauer, M.L. |
0.5 - 0.5 |
| | | |
| Philadelphia 1939 |
Manhattan Club - Philadelphia Match |
| | | | | | |
|
Horowitz, I.A. - Morris, H.R. |
1 - 0 |
| | | |
| New York 1939 (6) |
40th American Chess Federation Congress - Preliminary Section 3 |
4.5 | / | 6 |
| | | |
| New York 1939 (8) |
40th American Chess Federation Congress - Final |
8 | / | 11 |
| | | |
| New York 1939 (12) |
Manhattan Club - Westside YMCA Club Match |
| | | | | | |
|
Horowitz, I.A. - Neckermann, M.F. |
1 - 0 |
| | | |
| New York 1939 (14) |
Manhattan Club - New Jersey League Match |
| | | | | | |
|
Horowitz, I.A. - McCormick, E.T. |
1 - 0 |
| | | |
| New York 1942 (3) |
Marshall Club - Manhattan Club Match |
| | | | | | |
|
Horowitz, I.A. - Seidman, H. |
1 - 0 |
| | | |
| New York 1942 (4) |
4th USA Chammpionship - Final |
8 | / | 14 |
| | | |
| Cazenovia 1942 |
New York State Chess Association Championship |
8 | / | 9 |
| | | |
| Dallas 1942 |
43rd USA Open Championship |
15.5 | / | 17 |
| | | |
| Syracuse 1943 |
New York State Chess Association Championship |
14 | / | 15 |
| | | |
| New York 1944 (2) |
U.S.A. Championship - Final |
14 | / | 17 |
| | | |
| Hollywood 1945 |
Pan American Tournament |
8 | / | 12 |
| | | |
| Moscow and New York 1945 |
USSR - USA Radio Match |
| | | | | | |
|
Horowitz, I.A. - Flohr, S.M. |
1 - 1 |
| | | |
| Moscow 1946 (3) |
U.S.S.R. - U.S.A. Match |
| | | | | | |
|
Horowitz, I.A. - Boleslavsky, I.E. |
1 - 1 |
| | | |
| New York 1946 (4) |
6th U.S.A. Championship |
12 | / | 18 |
| | | |
