I don't know about the longest forced mate ever executed in a human game, but a 524-move win is found in seven-piece tablebases. See below:
http://www.youtube.com/watch?v=wxIaMcO2amE
What is the longest Directmate done by a human ?
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Hello everyone :)
I was just wondering if you knew what is the longuest Directmate in the history of chess ?
What do i mean as a directmate ?
For example:
White to move and checkmate Black in n moves against any defence, where n is some particular number.
So what is the biggest n as you know ?