| Name: | Gerson Costamilan |
| Federation: |  |
| Years: | 1978 - 1978 |
| Total Games: | 7 |
| Wins: | 1 (14.29 %) |
| Draws: | 3 (42.86 %) |
| Losses: | 3 (42.86 %) |
| Score: | 35.71 % |
| Tournament | Date | Elo Avg. | Country |
| BRA-ch U18 | ??/??/1978 | 0 |  Brazil |
| ECO | Opening | Games |
| B26 | Sicilian, closed, 6.Be3 | 1 games |
| B09 | Pirc, Austrian attack | 1 games |
| B24 | Sicilian, closed | 1 games |
| ECO | Opening | Games |
| A11 | English, Caro-Kann defensive system | 1 games |
| C07 | French, Tarrasch, open variation | 1 games |
| E17 | Queen's Indian, 5.Bg2 Be7 | 1 games |
| E24 | Nimzo-Indian, Saemisch variation | 1 games |
| White | ELO W | Black | ELO B | Result | Moves | ECO | Date | Tournament | View |
| Costamilan, G | Daher, F | 0-1  |
44 | B26 | 1978 | BRA-ch U18 |
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| Costamilan, G | Milos, G | 0-1 |
43 | B09 | 1978 | BRA-ch U18 |
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| Costamilan, G | Frota, A | ½-½ |
31 | B24 | 1978 | BRA-ch U18 |
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| Oliveira, C | Costamilan, G | ½-½ |
40 | A11 | 1978 | BRA-ch U18 |
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| Godois, J | Costamilan, G | 0-1 |
27 | C07 | 1978 | BRA-ch U18 |
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| Andrade, L | Costamilan, G | 1-0 |
45 | E17 | 1978 | BRA-ch U18 |
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| Dabus, S | Costamilan, G | ½-½ |
12 | E24 | 1978 | BRA-ch U18 |
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