The winning New York Win 4 numbers for September 15, 1991 were: evening 2-5-1-5.
Sum is the digits added together (5+5+0 = 10). Root sum keeps adding until one digit is left (10 → 1+0 = 1) — many regular players track it in their notebooks. Odd/Even marks each digit O or E (5-5-0 = OOE). High/Low marks 0–4 as L and 5–9 as H (5-5-0 = HHL).
| Date | Draw | Numbers | Sum | Root |
|---|---|---|---|---|
| Sep 15, 1991 | Evening | 2-5-1-5 | 13 | 4 |
| Sep 14, 1991 | Evening | 9-7-3-8 | 27 | 9 |
| Sep 13, 1991 | Evening | 7-4-7-6 | 24 | 6 |
| Sep 12, 1991 | Evening | 3-7-7-3 | 20 | 2 |
| Sep 11, 1991 | Evening | 4-1-9-5 | 19 | 1 |
| Sep 10, 1991 | Evening | 8-2-4-1 | 15 | 6 |
| Sep 9, 1991 | Evening | 3-4-8-6 | 21 | 3 |