| 1123 | Salary | Autumn School Contest 2001 | 3721 | 119 |
| 1297 | Palindrome | Spring School Contest 2004 | 5421 | 85 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3124 | 149 |
| 1635 | Mnemonics and Palindromes | USU Championship 2008 | 1822 | 195 |
| 1714 | Mnemonics and Palindromes 2 | NEERC 2009 Eastern Subregional | 103 | 2856 |
| 1737 | Mnemonics and Palindromes 3 | USU Championship 2009 | 1375 | 232 |
| 1761 | Binary Palindrome | USU Personal Contest 2010 | 299 | 1000 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 52 | 3398 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 466 | 443 |
| 1989 | Subpalindromes | Ural FU Championship 2013 | 677 | 293 |
| 2037 | Richness of binary words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 164 | 986 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 236 | 697 |
| 2042 | Nikita | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 25 | 4902 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 67 | 2228 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 349 | 478 |
