Graphical, networked, two-(human)-player Tic-Tac-Toe
PHP, work in progress (474 chars / 2 upvotes = 237 score)

It's fully functional except it doesn't have win detection yet.


  


What I really like about this solution is that I only learned PHP about 3 days ago, so the code is probably terrible. :D

t.php, 474 chars (newlines can be removed and are there only for readability):

&lt;style&gt;#d&gt;*{display:block;border:1px solid #000;width:50px;height:50px;float:left;text-align:center}#d{width:160px}&lt;/style&gt;&lt;div id=d&gt;&lt;?php
$f=file("a");$p=$_GET["p"];if($p!="x"&amp;&amp;$p!="o")die();
if(isset($_GET["m"])){$s=$f[0];$s[intval($_GET["m"])]=$p;fwrite(fopen('a','w'),$s.($f[1]=='x'?'o':'x'));echo"&lt;a href='t.php?p=$p'&gt;back&lt;/a&gt;";}
else{$i=0;while($i&lt;9){$s=($p==$f[1]&amp;&amp;$f[0][$i]=='.')?'a':'div';echo"&lt;$s href='t.php?p=$p&amp;m=$i'&gt;".$f[0][$i++]."&lt;/$s&gt;";}echo $f[1]."'s turn";}
?&gt;


reset.php, 57 chars

&lt;?php fwrite(fopen('a','w'),"..........\nx");?&gt;Reset done




It's live on my website. Player X should go to this URL:

http://keyboardfire.com/misc/tictactoegolf/t.php?p=x


And Player O should go here:

http://keyboardfire.com/misc/tictactoegolf/t.php?p=o


(don't worry, I added a check that only lets player "o" or "x" in so that you can't do any fancy XSS stuff :P)

To reset, go here:

http://keyboardfire.com/misc/tictactoegolf/reset.php


Obviously, it's really easy to cheat (moving for the other player, randomly resetting the board, etc.), but it's code golf so it doesn't matter :P