September Challenge 2016
Faded Palindromes, Chef and calculation, Chef and digits of a number
January Challenge 2017
Capital Movement, Cats and Dogs
February Challenge 2017
Chef and Triangles, Chef and His Apartment Dues
April Challenge 2017
Similar Dishes, Dish Of Life
June Challenge 2017
A Good Set, Xenny and Coin Rankings
July Challenge 2017
Chef and Sign Sequences, Calculator
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Greedy Candidates
September Challenge 2017
Chef and Pick Digit, Little Chef and Sums, Minimum Good Permutation
October Challenge 2017
Max Mex, A Balanced Contest
January Challenge 2018
Maximum Score, Rectangle, String Merging, Partition the numbers
January Cook-Off 2018
Multiple of 3, Survive in ChocoLand
February Challenge 2018
Broken Clock, Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
India