At 08:05 PM 8/23/2006, Joshua Zucker wrote:

But in May there was a 517 move endgame win discovered! One announcement of that is at http://216.25.93.108/forum/viewtopic.php?t=2860 and it's also mentioned in the wikipedia article.

That's the one I was thinking about. They were assuming a max of 511 or 512, then that one was found.