Games played by Alexander Costello
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Zhu, J | 2364 | Costello, A | 2231 | 0-1  |
39 | C46 | 2019 | Bay Area Int Open 2019 |
|
| Costello, A | 2231 | Hong, A | 2390 | 0-1 |
32 | B20 | 2019 | Bay Area Int Open 2019 |
|
| Virtanen, T | 2326 | Costello, A | 2231 | ½-½ |
47 | A15 | 2019 | Bay Area Int Open 2019 |
|
| Canessa, J | 1958 | Costello, A | 2231 | 0-1 |
66 | C95 | 2019 | Bay Area Int Open 2019 |
|
| Costello, A | 2231 | Wang, K | 2450 | 0-1 |
66 | B09 | 2019 | Bay Area Int Open 2019 |
|