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==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=77768 Fortress detection?] by [[Martin Fierz]], [[CCC]], July 21, 2021 » [[Checkers]]
* [https://www.talkchess.com/forum3/viewtopic.php?f=2&t=78628 Formal definition of fortresses] by Hedinn Steingrimsson, [[CCC]], November 10, 2021
=External Links=
