| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. G Umezinwa vs Dzindzichashvili |
| 0-1 | 29 |
1986 |
Illinois Class M/X | E91 King's Indian |
| 2. G Umezinwa vs E Schiller |
| ½-½ | 13 |
1987 |
Illinois | D32 Queen's Gambit Declined, Tarrasch |
| 3. G Umezinwa vs G S De Fotis |
| ½-½ | 33 |
1987 |
Midwest Masters op | A88 Dutch, Leningrad, Main Variation with c6 |
| 4. G Umezinwa vs Igor Ivanov |
| 1-0 | 54 |
1989 |
Midwest Masters Inv | B06 Robatsch |
| 5. Bisguier vs G Umezinwa |
| 1-0 | 48 |
1989 |
It (open) | E12 Queen's Indian |
| 6. Kamsky vs G Umezinwa |
| 1-0 | 45 |
1989 |
Chicago | C18 French, Winawer |
| 7. Sherzer vs G Umezinwa |
| 1-0 | 27 |
1990 |
It (open) | B90 Sicilian, Najdorf |
| 8. G Umezinwa vs Rohde |
| 0-1 | 45 |
1990 |
Chicago (USA) | A46 Queen's Pawn Game |
| 9. D Gurevich vs G Umezinwa |
| 1-0 | 34 |
1990 |
Master Challenge XII | E06 Catalan, Closed, 5.Nf3 |
| 10. G Umezinwa vs E Schiller |
| ½-½ | 10 |
1990 |
Chicago (USA) | D02 Queen's Pawn Game |
| 11. Browne vs G Umezinwa |
| 1-0 | 24 |
1991 |
It (open) | D37 Queen's Gambit Declined |
| 12. Sherzer vs G Umezinwa |
| 1-0 | 34 |
1991 |
It (open) | B90 Sicilian, Najdorf |
| 13. DeFirmian vs G Umezinwa |
| 1-0 | 41 |
1993 |
New York op (03) | B89 Sicilian |
| 14. D Gurevich vs G Umezinwa |
| 1-0 | 32 |
1993 |
Illinois op | E00 Queen's Pawn Game |
| 15. G Umezinwa vs P Truong |
| ½-½ | 52 |
1993 |
USA-chT Amateur East | D55 Queen's Gambit Declined |
| 16. G Umezinwa vs Ashley |
| 0-1 | 32 |
1994 |
It (cat.8), New York (USA) | E15 Queen's Indian |
| 17. D Gurevich vs G Umezinwa |
| ½-½ | 41 |
1994 |
It (open) | E06 Catalan, Closed, 5.Nf3 |
| 18. Browne vs G Umezinwa |
| 1-0 | 28 |
1994 |
USA | E17 Queen's Indian |
| 19. G Umezinwa vs Waitzkin |
| ½-½ | 68 |
1994 |
1st Murphy-ACF Intl New York | A46 Queen's Pawn Game |
| 20. G Umezinwa vs G Orlov |
| 0-1 | 57 |
1994 |
It (open) | E33 Nimzo-Indian, Classical |
| 21. Sherzer vs G Umezinwa |
| 1-0 | 49 |
1994 |
New York Open | C96 Ruy Lopez, Closed |
| 22. T Redman vs G Umezinwa |
| 0-1 | 16 |
2000 |
World Open | D35 Queen's Gambit Declined |
| 23. G Umezinwa vs D Ippolito |
| 0-1 | 60 |
2000 |
World Open | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 24. G Umezinwa vs Ananth Pappu |
| ½-½ | 98 |
2001 |
10th Open | D12 Queen's Gambit Declined Slav |