Before starting to think, let's just rewrite it to 139: 
s//123
456
789
z147,258,369,159,357/;$p=X;sub d{/z/;print$`.$p;@_&&die@_}
{d;1until<>=~/\d/&&s/$&/$p/g;/$p{3}/?d$p:/\d/?$p^=v23:d Tie;redo}

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In reply to Re: (Golf) Tic Tac Toe by Anonymous Monk
in thread (Golf) Tic Tac Toe by delirium

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