The winning Delaware Play 4 numbers for September 18, 1991 were: night 9-7-3-4.
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 18, 1991 | Night | 9-7-3-4 | 23 | 5 |
| Sep 17, 1991 | Night | 5-1-7-2 | 15 | 6 |
| Sep 16, 1991 | Night | 4-6-6-0 | 16 | 7 |
| Sep 15, 1991 | Night | 5-0-6-1 | 12 | 3 |
| Sep 14, 1991 | Night | 0-4-4-8 | 16 | 7 |
| Sep 13, 1991 | Night | 3-1-5-1 | 10 | 1 |
| Sep 12, 1991 | Night | 6-4-0-2 | 12 | 3 |