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* [http://www.talkchess.com/forum/viewtopic.php?t=65087 Horizon effect] by [[Harm Geert Muller]], [[CCC]], September 05, 2017
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=67823 Horizon effect and extensions] by [[Vivien Clauzon]], [[CCC]], June 25, 2018 » [[Extensions]]
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=73853 Taboo moves] by [[Harm Geert Muller]], [[CCC]], May 06, 2020
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