July Cook-Off 2015
Maximize Disjoint Pair Sum, Cops and the Thief Devu
September Challenge 2016
Chef and Friends, Dividing Machine, Chef and digits of a number, Faded Palindromes, Chef and calculation
January Challenge 2017
Capital Movement, Cats and Dogs, Chef and Circle, Digits Cannot Separate, Reservior, Tourists in Mancunia
February Challenge 2017
Gerrymander, Chef and His Apartment Dues, Interval Game, Chef and Triangles
September Challenge 2017
Sereja and Commands, Chef and Pick Digit, Minimum Good Permutation, Fill The Matrix, Little Chef and Sums
October Challenge 2017
A Balanced Contest, Counter Test For CHEFSUM, Max Mex
June Lunchtime 2017
Maximum Unique Segment, Two Numbers, Company and Club Hierarchies
July Lunchtime 2017
Find the Maximum Value, Travel to all Points, Divide the Set
May Challenge 2019 Division 1
Ada Rooks 2, Where to Build the Roads
Germany