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=Conditions/Restrictions=
Some programs restrict extensions, with either a maximum limit, or via other conditions, such as depth or iteration. Care must be taken so that the search is not extended infinitely (see [[Search Explosion|search explosion]]). Some programs vary the extension based on the expected [[Node Types|node type]]. For example, in an expected [[Node Types#ALL|All-node]], it might use 1/2 a ply extension for a pawn to the 7th, but a full ply on the [[Node Types#PV|PV-node]] research.
==Non-reductions==
==1996 ...==
* [https://groups.google.com/d/msg/rec.games.chess.computer/1uVIWZFB41k/VUcAUkzyFd0J Fractional depth increments] by S. Read, [[Computer Chess Forums|rgcc]], January 18, 1996
* [https://groups.google.com/d/msg/rec.games.chess.computer/tcjwWnFhXt4/ifkLE7GwfSEJ Crafty V11.3] by [[Robert Hyatt]], [[Computer Chess Forums|rgcc]], October 22, 1996 » [[Crafty]]
* [https://www.stmintz.com/ccc/index.php?id=12201 "Suspicious move" extension] by [[David Eppstein]], [[CCC]], November 20, 1997
* [https://www.stmintz.com/ccc/index.php?id=13993 Extensions?!] by [[Daniel Homan]], [[CCC]], January 13, 1998
