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* [http://www.talkchess.com/forum/viewtopic.php?t=60435 Singular extension] by [[Daniel José Queraltó]], [[CCC]], June 11, 2016 » [[Andscacs]]
* [http://www.talkchess.com/forum/viewtopic.php?t=66270 Singular extension improvement idea] by [[Jerry Donald]], [[CCC]], January 08, 2018
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=68290 singular extension] by [[Vivien Clauzon]], [[CCC]], August 24, 2018
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