February Challenge 2015
Chef and Equality, Chef and Chain
April Challenge 2015
Chef and Interview, Broken Telephone, Division of Lands, Chef and Piano Scales
June Challenge 2015
Chef and Polygons, Chef and Memory Limit
July Challenge 2015
Na2a and lucky stone, Chef and Cube
October Challenge 2016
Sereja and Progressions, Chef and Keyboard
November Challenge 2016
Count Permutations, Chef and squares, Task for Alexey
Canada