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'''[[Main Page|Home]] * [[Search]] * [[Selectivity]] * Extensions'''
Many programs '''extend''' certain moves to try and find better moves faster, or to resolve tactical "noise" resulting from the [[Horizon Effect|horizon effect]]. To extend a move, its [[Depth|search depth]] (draft) is incremented by some amount, typically one [[Ply|ply]]. =Inside the Loop=Some extensions may be determined inside the move loop before or after [[Make Move|making the move]], the latter case often delayed to the recursively called search routine by some programs:
<pre>
for each move m € of all moves {
* [http://www.talkchess.com/forum/viewtopic.php?t=59598 Extensions in the days of LMR?] by [[Martin Fierz]], [[CCC]], March 22, 2016 » [[Late Move Reductions|LMR]]
* [http://www.talkchess.com/forum/viewtopic.php?t=67131 Depth extensions and effect on transposition queries] by [[Kenneth Jones]], [[CCC]], April 16, 2018 » [[Transposition Table]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=67823 Horizon effect and extensions] by [[Vivien Clauzon]], [[CCC]], June 25, 2018 » [[Horizon Effect]]
=External Links=
