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* [http://www.talkchess.com/forum/viewtopic.php?t=48274 First post (and FailHigh question!)] by [[Natale Galioto]], [[CCC]], June 14, 2013 » [[Fail-High]], [[Fail-Soft]]
* [http://www.talkchess.com/forum/viewtopic.php?t=51284 Fail soft vs fail hard] by [[Sergei Markoff|Sergei S. Markoff]], [[CCC]], February 15, 2014 » [[Fail-Soft]], [[Fail-Low]], [[Internal Iterative Deepening]]
==2020 ...==
* [https://www.talkchess.com/forum3/viewtopic.php?f=7&t=79223 Fail hard/soft] by Philippe Chevalier, [[CCC]], January 28, 2022
=External Links=
* [https://en.wikipedia.org/wiki/Alpha%E2%80%93beta_pruning#Pseudocode Alpha–beta pruning from Wikipedia]
* [https://www.ics.uci.edu/~eppstein/180a/990202b.html Lecture notes for February 2, 1999 Variants of Alpha-Beta Search] by [[David Eppstein]
'''[[Alpha-Beta|Up one Level]]'''
