| 102500 | Sharma - Costin | 1-0 | 17th of May 2018 11:25:44 | (chess) | rated |
| 102505 | Costin - Konyukhov | 1-0 | 2nd of April 2018 11:48:14 | (chess) | rated |
| 102509 | Price - Costin | 1-0 | 27th of May 2018 12:18:27 | (chess) | rated |
| 102512 | Costin - Chesster | 1-0 | 16th of April 2018 21:03:22 | (chess) | rated |
| 102514 | Skorokhod - Costin | 0-1 | 5th of May 2018 22:38:02 | (chess) | rated |
| 102516 | Costin - Vollmer | 0-1 | 22nd of May 2018 11:47:49 | (chess) | rated |
| 103729 | Costin - Puzanov | 1-0 | 17th of April 2018 21:09:03 | (big_chess) | rated |
| 103734 | Kehayov - Costin | 1-0 | 17th of May 2018 11:25:44 | (big_chess) | rated |
| 103738 | Costin - Fachriansyah | 1-0 | 17th of April 2018 21:09:03 | (big_chess) | rated |
| 103741 | Capung - Costin | 0-1 | 22nd of May 2018 23:48:54 | (big_chess) | rated |
| 103743 | Costin - Pipac | 0-1 | 12th of May 2018 23:14:11 | (big_chess) | rated |
| 103744 | Rivenburg - Costin | 0-1 | 1st of May 2018 10:16:39 | (big_chess) | rated |
| 104278 | Costin - Tkac | 0-1 | 31st of May 2018 00:31:30 | (chess) | rated |
| 104283 | Bromo - Costin | 1-0 | 12th of May 2018 23:14:11 | (chess) | rated |
| 104288 | Costin - Coggiola | 0-1 | 13th of May 2018 23:16:53 | (chess) | rated |
| 104289 | Leurette - Costin | 1-0 | 12th of May 2018 11:13:51 | (chess) | rated |
| 104290 | Costin - Polgar | 1-0 | 30th of April 2018 10:03:47 | (chess) | rated |
| 104291 | Vreugdenhil - Costin | 1-0 | 23rd of May 2018 11:49:40 | (chess) | rated |
| 112875 | Costin - Martinez Camacho | 1-0 | 26th of March 2019 14:55:52 | (chess) | rated |
| 112880 | Goldmund - Costin | 0-1 | 31st of December 2018 19:21:11 | (chess) | rated |
| 112885 | Costin - Kalapos | 1-0 | 23rd of January 2019 06:52:11 | (chess) | rated |
| 112886 | Hadden - Costin | 1-0 | 9th of June 2019 06:41:14 | (chess) | rated |
| 112887 | Costin - Strohmeier | 1-0 | 27th of May 2019 14:18:49 | (chess) | rated |
| 112888 | Valentin - Costin | 0-1 | 16th of April 2019 13:58:25 | (chess) | rated |
| 112969 | Costin - Drozdovas | 1-0 | 18th of December 2018 16:08:03 | (chess) | unrated |
| 112986 | Tanriover - Costin | 1-0 | 30th of April 2019 18:51:49 | (chess) | unrated |
| 113002 | Costin - Foster | 0-1 | 17th of April 2019 18:44:14 | (chess) | unrated |
| 113017 | Pyran - Costin | 0-1 | 28th of January 2019 07:01:41 | (chess) | unrated |
| 113031 | Costin - Barbosa | 0-1 | 10th of April 2019 11:10:32 | (chess) | unrated |
| 113044 | Christye - Costin | 1-0 | 15th of April 2019 21:33:23 | (chess) | unrated |
| 113056 | Costin - Tatundu | 1-0 | 15th of January 2019 17:59:11 | (chess) | unrated |
| 113067 | Peedikakkandy - Costin | 0-1 | 15th of April 2019 15:25:28 | (chess) | unrated |
| 113077 | Costin - Csoma | 1-0 | 27th of January 2019 16:25:59 | (chess) | unrated |
| 113086 | Pintor - Costin | 0-1 | 3rd of January 2019 17:32:29 | (chess) | unrated |
| 113094 | Costin - Coggiola | 1-0 | 12th of January 2019 13:19:24 | (chess) | unrated |
| 113101 | Radding - Costin | 0-1 | 5th of February 2019 15:15:08 | (chess) | unrated |
| 113108 | Costin - Leurette | 1-0 | 17th of January 2019 09:11:21 | (chess) | unrated |
| 113109 | Baggersgaard - Costin | 0-1 | 9th of February 2019 19:52:45 | (chess) | unrated |
| 113110 | Costin - Kehayov | 1-0 | 4th of January 2019 09:06:08 | (chess) | unrated |
| 113111 | Kalapos - Costin | 0-1 | 20th of January 2019 06:40:28 | (chess) | unrated |
| 113112 | Costin - Valentin | 1-0 | 25th of December 2018 11:40:32 | (chess) | unrated |
| 113113 | Pezzei - Costin | 0-1 | 16th of January 2019 05:58:55 | (chess) | unrated |