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    The Chess Move Validation hole will go live in approximately . Why not try and solve it ahead of time?

    Recent Solutions

    Hole Golfer Bytes Time Submitted
    𝑒 Steffan153 🥇 50
    ln 2 Steffan153 🥇 53
    Reverse Polish Notation stellartux 206
    π Steffan153 57
    Collatz stellartux 113
    √2 Steffan153 52
    φ Steffan153 🥇 50
    Catalan’s Constant Steffan153 🥉 65
    Thue–Morse Constant JOrE20 1,014
    Leap Years Mikey-Beep 74
    Topological Sort stellartux 🥉 175
    Morse Decoder stellartux 1,242
    Morse Encoder stellartux 1,242
    ROT13 stellartux 192
    Thue–Morse Constant IanUtley 70
    Thue–Morse Constant HumanoidCPU 1,014
    Tutorial quasar098 179
    Emojify scpchicken 653
    DFA Simulator scpchicken 1,426
    Day of Week scpchicken 1,152
    CSS Colors scpchicken 4,824
    Continued Fractions scpchicken 810
    Card Number Validation scpchicken 700
    Calendar scpchicken 🥉 1,248
    brainfuck scpchicken 2,041
    Billiards scpchicken 🥉 862
    Arrows scpchicken 1,035
    Arabic to Roman scpchicken 1,167
    Evil Numbers (Long) scpchicken 1,961
    Evil Numbers scpchicken 81
    Farey Sequence scpchicken 4,365
    Factorial Factorisation scpchicken 873
    Emirp Numbers (Long) scpchicken 1,167
    Emirp Numbers scpchicken 147
    Diamonds scpchicken 1,114
    Christmas Trees scpchicken 556
    Cubes scpchicken 4,112
    Alphabetic Numbers scpchicken 🥉 3,906
    Gijswijt’s Sequence scpchicken 2,011
    Catalan’s Constant scpchicken 1,014
    Catalan Numbers scpchicken 2,883
    Ascending Primes scpchicken 523
    Arithmetic Numbers scpchicken 37,653
    Abundant Numbers (Long) scpchicken 4,409
    Abundant Numbers scpchicken 808
    99 Bottles of Beer scpchicken 16,072
    24 Game scpchicken 31,501
    12 Days of Christmas scpchicken 1,009
    Connect Four scpchicken 🥈 1,303
    Yellowstone Permutation HumanoidCPU 4,022
    Ulam Sequence dokutan 🥉 1,019
    Ulam Sequence IanUtley 🥈 123
    Ulam Sequence Steffan153 💎 78
    Nim IanUtley 🥇 119
    π vhoulbreque 1,017
    Prime Numbers (Long) DialFrost 71
    Alphabetic Numbers retrohun 🥉 3,906
    Nim Steffan153 🥇 119
    Tower of Hanoi Andrey2001 3,591
    γ retrohun 1,014
    Ten-pin Bowling JOrE20 2,752
    Partition Numbers GolfingSuccess 🥉 76
    Lucky Tickets GolfingSuccess 109
    Connect Four IanUtley 💎 332
    Catalan Numbers GolfingSuccess 🥉 50
    ln 2 retrohun 1,014
    γ Haksell 1,014
    Calendar annaproxy 💎 297
    Gray Code Encoder annaproxy 69
    Multitap Input IanUtley 💎 114
    Multitap Input annaproxy 🥈 137
    Leap Years scpchicken 70
    Alphabetic Numbers CaedenHarper 🥉 3,906
    Taxicab Numbers oaiqjuy 🥈 236
    Leap Years Steffan153 🥇 52
    π hiichbindermax 296
    Fizz Buzz hiichbindermax 133
    Collatz scpchicken 95
    Pascal’s Triangle LSWdigital 102
    Ulam Sequence HumanoidCPU 1,104
    Alphabetic Numbers KatieLG 4,909
    Alphabetic Numbers dokutan 🥈 3,150
    Ulam Sequence Shanethegamer 1,104
    Fibonacci Herbert00709 160
    Kaprekar Numbers IanUtley 💎 102
    Taxicab Numbers dokutan 🥉 4,171
    Leap Years Lydxn 🥇 52
    Fibonacci Matter1024 62
    Fractions Mikey-Beep 165
    PalindromemordnilaP Mikey-Beep 185
    Odious Numbers (Long) Mikey-Beep 74
    Odious Numbers Mikey-Beep 72
    Evil Numbers (Long) Mikey-Beep 74
    Evil Numbers Mikey-Beep 72
    Pernicious Numbers (Long) Mikey-Beep 89
    Pernicious Numbers Mikey-Beep 78
    Pangram Grep Mikey-Beep 155
    Arrows Mikey-Beep 329
    24 Game madeforlosers 12,443
    Arabic to Roman ComradeSquirrel 280