50 games in the PremovedPrep archive. Games as White.
| White | Black | Result | ECO | Event | Date |
|---|---|---|---|---|---|
| Costello, Colin A | Eilenberg, Jonas | 0-1 | A21 | Round 1: Costello, Colin A - Eilenberg, Jonas | 2026-07-30 |
| Costello, Colin A | Farrand, Tom | 0-1 | A13 | Round 1: Costello, Colin A - Farrand, Tom | 2026-07-06 |
| Costello, Colin A | Cooper, Malcolm H | 1-0 | D12 | Round 2: Costello, Colin A - Cooper, Malcolm H | 2026-02-21 |
| Costello, Colin A | Tarrant-Edwards, Philip | 1/2-1/2 | D37 | Round 5: Costello, Colin A - Tarrant-Edwards, Philip | 2025-02-23 |
| Costello, Colin A | Catabay, Rezin C | 1/2-1/2 | A29 | Round 3: Costello, Colin A - Catabay, Rezin C | 2025-02-22 |
| Costello, Colin A | Lloyd, Joel | 1-0 | D45 | Round 1: Costello, Colin A - Lloyd, Joel | 2025-02-21 |
| Costello, Colin A | Mottram, Paul | 1-0 | D43 | Round 4: Costello, Colin A - Mottram, Paul | 2025-02-20 |
| Costello, Colin A | Bowley, Clive | 1/2-1/2 | A10 | Round 5: Costello, Colin A - Bowley, Clive | 2025-02-20 |
| Costello, Colin A | Warner, Nicholas | 1-0 | A21 | Round 2: Costello, Colin A - Warner, Nicholas | 2025-02-18 |
| Costello, Colin A | Shevchenko, Igor | 0-1 | C00 | Round 5: Costello, Colin A - Shevchenko, Igor | 2024-11-17 |
| Costello, Colin A | Beckmann, Jonathan | 1/2-1/2 | A28 | Round 3: Costello, Colin A - Beckmann, Jonathan | 2024-11-16 |
| Costello, Colin A | Laube, Reiner | 0-1 | A10 | Round 1: Costello, Colin A - Laube, Reiner | 2024-11-15 |
| Colin Costello | Matthey, Harald | 0-1 | A10 | Round 6: Colin Costello - Matthey, Harald | 2024-07-06 |
| Colin Costello | Ruether, Rudolf | 0-1 | A28 | Round 4: Colin Costello - Ruether, Rudolf | 2024-07-04 |
| Colin Costello | Krueger, Erich | 1-0 | A16 | Round 2: Colin Costello - Krueger, Erich | 2024-07-02 |
| Colin Costello | Rudolf Ruether | 1/2-1/2 | A29 | Round 2: Colin Costello - Rudolf Ruether | 2023-07-04 |
| Costello, Colin A | Jerome, Stellio | 1-0 | A10 | Chessable British Chess Championships: Seniors 65+ | 2022-08-18 |
| Costello, Colin A | James, Geoffrey H | 1/2-1/2 | A22 | Chessable British Chess Championships: Seniors 65+ | 2022-08-15 |
| Costello, Colin A | Footner, Andrew F | 0-1 | A25 | Chessable British Chess Championships: Seniors 65+ | |
| Costello, Colin A | Clancy, Martin J | 1-0 | A16 | Round 2: Costello, Colin A - Clancy, Martin J | |
| Costello, Colin A | Clark, Robert G | 1/2-1/2 | A29 | Round 4: Costello, Colin A - Clark, Robert G | |
| Costello, Colin A | De Coverly, Roger D | 1-0 | A16 | Round 6: Costello, Colin A - De Coverly, Roger D | |
| Costello, Colin A | Ichim, Grieg | 0-1 | A33 | Round 2: Costello, Colin A - Ichim, Grieg | |
| Costello, Colin A | Jamie Barnes | 0-1 | A35 | Round 4: Costello, Colin A - Jamie Barnes |