September Challenge 2016
Chef and digits of a number, Faded Palindromes
October Challenge 2016
Chef and Keyboard, Fenwick Iterations, Chef and Three Dogs
November Challenge 2016
Task for Alexey, Chef and squares, Gift and Chef, Friends Meeting, Count Permutations
August Cook-Off 2016
Tweedle-Dee and Tweedle-Dum
October Cook-Off 2016
Watson asks Does Permutation Exist, ChefWatson uses Social Network
January Challenge 2017
Capital Movement, Cats and Dogs, Reservior, Tourists in Mancunia
February Challenge 2017
Alice and her garden, Gerrymander, Most Frequent Element, Chef and his Best Friend, Chef and Triangles, Chef and Yoda, Chef and His Apartment Dues
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle, String Merging, Partition the numbers
May Challenge 2018 Division 2
Mighty Friend, Dibs on Fibs, Fake Binary Search, Xor Again, Minimum Deletions
November Challenge 2018 Division 2
Chef and Ridges, Chef and Happiness, Chef and Difficult Contests, Magician versus Chef 2, Chef, Primes and Trees (Challenge), Good Median, Appy Loves One
January Challenge 2019 Division 2
Yet Another Problem About Sequences, Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes, (Challenge) Chef and Matching Game, A Pizza Slice
India