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'''[[Main Page|Home]] * [[Search]] * [[Selectivity]] * [[Extensions]] * One Reply Extensions'''
'''One Reply Extensions''' or '''Singular Reply Extensions''' are extensions applied if the [[Side to move|side to move]] has only one [[Legal Move|legal move]]. Most likely this extension is loss-seeking while in [[Check|check]] where [[Move Generation#Legal|legal move generation]] is used. Therefore One Reply Extensions are combined with [[Check Extensions|check evasion extensions]], often considered with additional [[Extensions#FractionalExtensions|fractional plies]] to extend. However, as already pointed out by [[Bruce Moreland]] <ref>[http://web.archive.org/web/20070607151732/www.brucemo.com/compchess/programming/extensions.htm Search Extension] from [[Bruce Moreland|Bruce Moreland's]] [http://web.archive.org/web/20070607231311/www.brucemo.com/compchess/programming/index.htm Programming Topics]</ref> , there is some risk to create a sequence of check + single response that goes on essentially forever, which requires the One Reply Extension to be constrained.
=See also=
* [[Check Extensions]]
* [[Singular Extensions]]
=Forum Posts=
* [https://www.stmintz.com/ccc/index.php?id=43969 One Reply Extension] by [[Nobuhiro Yoshimura]], [[CCC]], February 20, 1999
* [https://www.stmintz.com/ccc/index.php?id=151549 How to extend if only one reply?] by [[Severi Salminen]], [[CCC]], January 23, 2001
* [https://www.stmintz.com/ccc/index.php?id=388362 Single Reply Extension] by [[Jan Renze Steenhuisen|Renze Steenhuisen]], [[CCC]], September 20, 2004
* [http://www.talkchess.com/forum/viewtopic.php?t=29366 Single legal move - what to do?] by [[Vlad Stamate]], [[CCC]], August 12, 2009
* [http://www.talkchess.com/forum/viewtopic.php?t=35186 Stockfish - single evasion extensions] by [[Ralph Stoesser]], [[CCC]], June 27, 2010 » [[Stockfish]]
=External Links=
* [http://web.archive.org/web/20070607151732/www.brucemo.com/compchess/programming/extensions.htm Search Extension] from [[Bruce Moreland|Bruce Moreland's]] [http://web.archive.org/web/20070607231311/www.brucemo.com/compchess/programming/index.htm Programming Topics]
* [http://www.frayn.net/beowulf/theory.html#extend Computer Chess Programming Theory - Search Extensions] by [[Colin Frayn]]
* [http://www.3dkingdoms.com/chess/implementation.htm Programming Details - Slow Chess | Extensions Used, Detailed Description] by [[Jonathan Kreuzer]] » [[Slow Chess]]
=References=
<references />
'''[[Extensions|Up one Level]]'''
'''One Reply Extensions''' or '''Singular Reply Extensions''' are extensions applied if the [[Side to move|side to move]] has only one [[Legal Move|legal move]]. Most likely this extension is loss-seeking while in [[Check|check]] where [[Move Generation#Legal|legal move generation]] is used. Therefore One Reply Extensions are combined with [[Check Extensions|check evasion extensions]], often considered with additional [[Extensions#FractionalExtensions|fractional plies]] to extend. However, as already pointed out by [[Bruce Moreland]] <ref>[http://web.archive.org/web/20070607151732/www.brucemo.com/compchess/programming/extensions.htm Search Extension] from [[Bruce Moreland|Bruce Moreland's]] [http://web.archive.org/web/20070607231311/www.brucemo.com/compchess/programming/index.htm Programming Topics]</ref> , there is some risk to create a sequence of check + single response that goes on essentially forever, which requires the One Reply Extension to be constrained.
=See also=
* [[Check Extensions]]
* [[Singular Extensions]]
=Forum Posts=
* [https://www.stmintz.com/ccc/index.php?id=43969 One Reply Extension] by [[Nobuhiro Yoshimura]], [[CCC]], February 20, 1999
* [https://www.stmintz.com/ccc/index.php?id=151549 How to extend if only one reply?] by [[Severi Salminen]], [[CCC]], January 23, 2001
* [https://www.stmintz.com/ccc/index.php?id=388362 Single Reply Extension] by [[Jan Renze Steenhuisen|Renze Steenhuisen]], [[CCC]], September 20, 2004
* [http://www.talkchess.com/forum/viewtopic.php?t=29366 Single legal move - what to do?] by [[Vlad Stamate]], [[CCC]], August 12, 2009
* [http://www.talkchess.com/forum/viewtopic.php?t=35186 Stockfish - single evasion extensions] by [[Ralph Stoesser]], [[CCC]], June 27, 2010 » [[Stockfish]]
=External Links=
* [http://web.archive.org/web/20070607151732/www.brucemo.com/compchess/programming/extensions.htm Search Extension] from [[Bruce Moreland|Bruce Moreland's]] [http://web.archive.org/web/20070607231311/www.brucemo.com/compchess/programming/index.htm Programming Topics]
* [http://www.frayn.net/beowulf/theory.html#extend Computer Chess Programming Theory - Search Extensions] by [[Colin Frayn]]
* [http://www.3dkingdoms.com/chess/implementation.htm Programming Details - Slow Chess | Extensions Used, Detailed Description] by [[Jonathan Kreuzer]] » [[Slow Chess]]
=References=
<references />
'''[[Extensions|Up one Level]]'''
