April Challenge 2016
Chef and Ballons, Chef And Coloring
September Challenge 2016
Chef and digits of a number, Faded Palindromes
April Cook-Off 2016
Movie Weekend, Odd Divisors
October Cook-Off 2016
Watson asks Does Permutation Exist, ChefWatson uses Social Network
March Challenge 2017
(CH) Bear and Sorted Rows, Bandwidth of a matrix, Bear and Extra Number, Xenny and Alternating Tasks
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
United States