| 1123 | Salary | Autumn School Contest 2001 | 3757 | 119 |
| 1297 | Palindrome | Spring School Contest 2004 | 5524 | 84 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3201 | 147 |
| 1635 | Mnemonics and Palindromes | USU Championship 2008 | 1842 | 194 |
| 1714 | Mnemonics and Palindromes 2 | NEERC 2009 Eastern Subregional | 103 | 2885 |
| 1737 | Mnemonics and Palindromes 3 | USU Championship 2009 | 1387 | 232 |
| 1761 | Binary Palindrome | USU Personal Contest 2010 | 301 | 1004 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 52 | 3461 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 483 | 435 |
| 1989 | Subpalindromes | Ural FU Championship 2013 | 687 | 294 |
| 2037 | Richness of binary words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 168 | 987 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 239 | 705 |
| 2042 | Nikita | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 26 | 4879 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 70 | 2196 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 363 | 471 |
