38 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Costello, Alexander | Bryant, John Daniel | 1/2-1/2 | E68 | SoCal State Championship | 2024-06-16 |
| Costello, Alexander | Akopian, Vladimir | 1/2-1/2 | C15 | Round 3: Costello, Alexander - Akopian, Vladimir | 2024-06-14 |
| Costello, Alexander | Eidelman, Gabriel | 0-1 | C79 | Round 5: Costello, Alexander - Eidelman, Gabriel | 2024-06-14 |
| Costello, Alexander | Khachiyan, Melikset | 1/2-1/2 | B35 | Round 1: Costello, Alexander - Khachiyan, Melikset | 2024-06-13 |
| Costello Alexander | Prieb Robert | * | D32 | MTO - 2023 | 2023-07-26 |
| Costello Alexander | Collin Moritz Valentin | 1-0 | A20 | MTO - 2023 | 2023-07-24 |
| Costello Alexander | Seul Georg | 1/2-1/2 | B12 | MTO - 2023 | 2023-07-21 |
| Costello Alexander | Vantika Agrawal | 0-1 | B51 | MTO - 2023 | 2023-07-19 |
| Costello Alexander | Rodrigue-Lemieux Shawn | 0-1 | D38 | MTO - 2023 | 2023-07-17 |
| Alexander Costello | Zoey Tang | 1-0 | B54 | Las Vegas National Open 2023 | 2023-06-18 |
| Alexander Costello | Mark Heimann | 1/2-1/2 | A06 | Las Vegas National Open 2023 | 2023-06-17 |
| Alexander J Costello | Varuzhan Akobian | 1/2-1/2 | B17 | Round 15: Alexander J Costello - Varuzhan Akobian | 2022-08-07 |
| Alexander J Costello | Grant Oen | 1-0 | B40 | Round 13: Alexander J Costello - Grant Oen | 2022-08-06 |
| Alexander J Costello | Andrew Wang | 1-0 | D90 | Round 11: Alexander J Costello - Andrew Wang | 2022-08-05 |
| Alexander J Costello | David Gasparyan | 1-0 | B35 | Round 9: Alexander J Costello - David Gasparyan | 2022-08-04 |
| Alexander J Costello | Jacob Teitelman | 1-0 | A06 | Round 7: Alexander J Costello - Jacob Teitelman | 2022-08-03 |
| Alexander Costello | Harry Le | 1/2-1/2 | A15 | Round 5: Alexander Costello - Harry Le | 2022-04-10 |
| Alexander Costello | Advaith Karthik | 0-1 | B31 | Round 7: Alexander Costello - Advaith Karthik | 2022-04-10 |
| Alexander Costello | Caleb Meyer-Chabris | 1-0 | A06 | Round 1: Alexander Costello - Caleb Meyer-Chabris | 2022-04-09 |
| Alexander Costello | Elijah Platnick | 1-0 | C70 | Round 3: Alexander Costello - Elijah Platnick | 2022-04-09 |