May Challenge 2017
Courses in an university, Median of adjacent maximum numbers, Chef and his daily routine
August Long Challenge 2017
Greedy Candidates, Mathison and the Data Warehouse (Challenge), Palindromic Game, Chef and Mover, Chef and Rainbow Array
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, Counter Test For CHEFSUM, A Balanced Contest
August Cook-Off 2017
Real obtuse, From heaven to earth
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams
January Challenge 2018
K-Concatenation, Maximum Score, Rectangle
March Challenge 2018 DIV 2
A Big Sale, Minion Chef and Bananas, Chef and Glove, Mix the Colors
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again, Fake Binary Search, Dibs on Fibs
India