September Challenge 2016
Faded Palindromes, Chef and digits of a number
October Challenge 2016
Chef and Three Dogs, Chef and Keyboard
November Challenge 2016
Chef and squares, Task for Alexey
October Cook-Off 2016
Watson asks Does Permutation Exist
April Challenge 2017
Dish Of Life, Similar Dishes
May Challenge 2017
Chef and his daily routine, Median of adjacent maximum numbers, Courses in an university
August Long Challenge 2017
Chef and Rainbow Array, 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
Villages and Tribes, Periodic Palindrome Construction, Chef goes Left Right Left
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle
January Lunchtime 2018
Chef and Game with Sequence
February Challenge 2018
Chef And His Characters, Chef And The Patents
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
December Challenge 2018 Division 2
Chef and Interactive Contests, Chef and An Ideal Problem
November Challenge 2018 Division 2
Chef and Ridges, Chef and Difficult Contests
February Challenge 2019 Division 2
Chef and Magical Jars, Chef and Secret Ingredients, Appy and Contest, Deputy Chef
India