September Challenge 2016
Chef and digits of a number, Faded Palindromes
October Challenge 2016
Chef and Keyboard, Chef and Three Dogs
February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
June Challenge 2017
Xenny and Coin Rankings, A Good Set, Chef and the Feast
July Challenge 2017
Chef and Sign Sequences, Whats in the Name, Calculator
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
March Challenge 2020 Division 2
XOR Engine, Ada Bishop 2, Pintu and Fruits
India