November Challenge 2017
Chef goes Left Right Left, Chef Hates Palindromes, Villages and Tribes, Periodic Palindrome Construction
February Challenge 2018
Chef And His Characters, Chef And The Patents, Car-pal Tunnel, Permutation and Palindrome
March Challenge 2018 DIV 2
Chef and Glove, Minion Chef and Bananas, Minions and Voting, Mix the Colors, A Big Sale, Chef and Easy Problem
April Challenge 2018 Division 2
Weight of Numbers, Highway Crossing, Count Good Prefixes, Average of Pairs, Workers
May Challenge 2018 Division 2
Dibs on Fibs, Minimum Deletions, Mighty Friend, Xor Again
July Challenge 2018 Division 2
Reach Equilibrium, No Minimum No Maximum, Magic Set, Strike or Spare, No Strings Attached
August Challenge 2018 Division 2
Problem Sort, Spell Bob, Sheokand and Number, Modular GCD, Coordinate Compression
October Challenge 2018 Division 1
Appy and Balloons , Beautiful Bricks, Minimize Digitsum, Chef and Surprise Chessboard, Chef and Serves, Byte to Bit
India