| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. M Arnold vs R Goletiani |
| 0-1 | 39 |
2004 |
32nd World Open | E00 Queen's Pawn Game |
| 2. S Reader vs M Arnold |
 | 0-1 | 50 |
2005 |
SuperNationals | D32 Queen's Gambit Declined, Tarrasch |
| 3. M Arnold vs Le Quang Liem |
| 0-1 | 38 |
2005 |
BELFORT YWCC BU14 | D10 Queen's Gambit Declined Slav |
| 4. P Coupet vs M Arnold |
| 0-1 | 53 |
2006 |
34th World Open | B22 Sicilian, Alapin |
| 5. J Bonin vs M Arnold |
| 0-1 | 36 |
2006 |
34th World Open | A15 English |
| 6. C Tanaka vs M Arnold |
| 0-1 | 31 |
2007 |
World Open | A57 Benko Gambit |
| 7. M Arnold vs B G Smith |
| 0-1 | 45 |
2007 |
World Open | D07 Queen's Gambit Declined, Chigorin Defense |
| 8. B Reichstein vs M Arnold |
| 0-1 | 62 |
2008 |
World Open | B54 Sicilian |
| 9. J Hanken vs M Arnold |
| 0-1 | 40 |
2008 |
World Open | A36 English |
| 10. M Arnold vs A Ramirez |
| 0-1 | 57 |
2008 |
World Open | D15 Queen's Gambit Declined Slav |
| 11. V Milov vs M Arnold |
| 0-1 | 41 |
2008 |
World Open | E41 Nimzo-Indian |
| 12. M Arnold vs R Dimitrov |
| 0-1 | 68 |
2010 |
World Junior Championship | E14 Queen's Indian |
| 13. M Larmuseau vs M Arnold |
| 0-1 | 47 |
2010 |
World Junior Championship | B40 Sicilian |
| 14. S Smarty vs M Arnold |
| 0-1 | 40 |
2010 |
38th World Open | A20 English |
| 15. I Ibragimov vs M Arnold |
| 0-1 | 40 |
2010 |
North American Open | E47 Nimzo-Indian, 4.e3 O-O 5.Bd3 |
| 16. A Diamant vs M Arnold |
| 0-1 | 56 |
2010 |
World Junior Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 17. M Arnold vs Lenderman |
| 0-1 | 47 |
2010 |
38th World Open | B41 Sicilian, Kan |
| 18. L Harmon vs M Arnold |
| 0-1 | 27 |
2010 |
North American Open | B80 Sicilian, Scheveningen |
| 19. B Kaleta vs M Arnold |
| 0-1 | 61 |
2010 |
World Junior Championship | A50 Queen's Pawn Game |
| 20. M Arnold vs A Zatonskih |
| 0-1 | 26 |
2011 |
Kings vs Queens | A21 English |
| 21. M Arnold vs Sasikiran |
| 0-1 | 30 |
2011 |
Corsica Masters Knockout | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 22. M Fierro vs M Arnold |
| 0-1 | 25 |
2011 |
Kings vs Queens | A14 English |
| 23. M Arnold vs M Molner |
| 0-1 | 53 |
2011 |
SPICE Cup (group B) | E10 Queen's Pawn Game |
| 24. R Sturt vs M Arnold |
| 0-1 | 51 |
2012 |
ch-USA Junior GpB | A58 Benko Gambit |
| 25. R Hungaski vs M Arnold |
| 0-1 | 46 |
2012 |
World Open | A22 English |
