March Challenge 2017
Bear and Extra Number, (CH) Bear and Sorted Rows, Bandwidth of a matrix, Xenny and Alternating Tasks
June Challenge 2017
A Good Set, Chef and the Feast, Xenny and Coin Rankings
July Challenge 2017
IPC Trainers, Calculator , Whats in the Name, Chef and Sign Sequences
August Long Challenge 2017
Chef and Rainbow Array, Chef and Mover, Palindromic Game, Greedy Candidates
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, Chef and a great voluntary Program, Chef and Magic Arrays, Max Mex
September Cook-Off 2017
Infinite OR Game, Statistics Construction, Subsequence Equality
October Cook-Off 2017
Chef and Counting Test, Chef and Employment Test, Chef and Weird Queries
November Cook-Off 2017
Skiing, Online Chess, Random Pair
August Lunchtime 2017
Mathison and the Dynamo shuffle, Mathison and pangrams
October Lunchtime 2017
Buggy Calculator, Maximum Number
February Cook-Off 2018
Chef and Cook-Off, Chef and Tuples, Chef and Line
February Lunchtime 2018
Game with numbers, Jumping in the hills
March Challenge 2018 DIV 1
Chef and Easy Problem, Mix the Colors, Minions and Voting
June Lunchtime 2018 Division 2
Summary Power, Counting Pretty Numbers
India