Connect-4 on 8x8 solved: player 2 wins 4ir forum

2 replies. Last post: 2015-11-21

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Connect-4 on 8x8 solved: player 2 wins
  • fhourplay at 2015-11-09

    Winning first-move replies are
    1 4
    2 3
    3 4
    4 4
    Only the 2 opening move requires a different reply, as 2 4 hands the win to the 1st player.
    The main opening lines have the first player switch to column 3 or 5 after playing the first 2, 4, or 6 ply in column 4,
    at which point the 2nd player can play on either side to block the threat.
    4 4  4 4  4 5 is also a 2nd player win, but 4 4  5 and 4 5 are 1st player wins.

    The solver used, together with an extensive opening book, is available at https://github.com/tromp/fhourstones88

  • Recalcitrant at 2015-11-21

    Congrats on solving the 8x8 board! Now I hope we can get 9x9 and 10x10 on LG...

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