February Challenge 2017
Chef and His Apartment Dues
March Challenge 2017
Xenny and Alternating Tasks, Bear and Extra Number
September Challenge 2017
Chef and Pick Digit, Minimum Good Permutation, Little Chef and Sums
October Challenge 2017
Max Mex, A Balanced Contest
December Challenge 2017
Chef And his Cake, Penalty Shoot-out, Chef and Hamming Distance of arrays
March Challenge 2018 DIV 2
A Big Sale, Mix the Colors, Chef and Glove
March Cook-off 2018 Division 2
Chef Goes to the Cinema, Chef Judges a Competition
September Mega Cook-Off 2018 Division 2
ATM Machine, Make a Permutation
October Mega Cook-Off 2018 Division 2
Binary Nim 2, Ada and the Staircase
April Challenge 2018 Division 2
Workers, Highway Crossing, Weight of Numbers, Average of Pairs
May Challenge 2018 Division 2
Mighty Friend, Minimum Deletions, Xor Again
July Challenge 2018 Division 2
Magic Set, Strike or Spare
September Challenge 2018 Division 2
Magician versus Chef, War of XORs, Chef and Adventures, Table Game, Bad Shuffle
November Challenge 2018 Division 2
Good Median, Chef and Happiness, Chef and Difficult Contests, Chef, Primes and Trees (Challenge), Appy Loves One, Chef and Ridges
September Lunchtime 2018 Division 2
Judging Delay, Chef Restaurant
December Lunchtime 2018 Division 2
Print Pattern, Choosing from Buckets, Age Calculator
January Challenge 2019 Division 2
Different Neighbours, Lucky Number Game, Distinct Pairs, Chef and Modulo Game, Fancy Quotes
India