April Challenge 2016
Chef And Coloring, Help Watson Escape
November Challenge 2016
Chef and squares, Task for Alexey
April Challenge 2017
Dish Of Life, Similar Dishes
May Challenge 2017
Chef and his daily routine, Courses in an university, Median of adjacent maximum numbers
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings
July Challenge 2017
Whats in the Name, Chef and Sign Sequences
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest
November Challenge 2017
Chef goes Left Right Left, Villages and Tribes
July Cook-Off 2017
Chang and Bitwise OR, Chang and the Perfect Function
November Challenge 2018 Division 2
Chef and Difficult Contests
India