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* [http://www.talkchess.com/forum/viewtopic.php?t=18081 fractal null move] by [[Pawel Koziol]], [[CCC]], November 28, 2007
'''2008'''
* [http://www.open-aurec.com/wbforum/viewtopic.php?f=4&t=49310 Null move question] by [[Fermin Serrano]], [[Computer Chess Forums|Winboard Forum]], June 30, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=24543 null move threat extension] by [[Andrew Short]], [[CCC]], October 23, 2008
'''2009'''
