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[[FILE:Le duelliste à l'épée et au poignard.jpg|border|right|thumb|Le duelliste à l'épée et au poignard <ref>[[Arts#Callot|Jacques Callot]] - [http://commons.wikimedia.org/wiki/File:Le_duelliste_%C3%A0_l%27%C3%A9p%C3%A9e_et_au_poignard.jpg Le duelliste à l'épée et au poignard], 1621-1625, Source: [http://gallica.bnf.fr/ark:/12148/btv1b8495739c/f1.item Les Gobbi, Le duelliste à l'épée et au poignard : estampe / Jacques Callot], [https://en.wikipedia.org/wiki/Biblioth%C3%A8que_nationale_de_France Bibliothèque nationale de France], [http://commons.wikimedia.org/wiki/Category:Jacques_Callot Category:Jacques Callot] from [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
A '''Double Attack''' [[Attacks|attacks ]] two or more pieces or important squares simultaneously with one [[Moves|move]], either by [https://en.wikipedia.org/wiki/Fork_%28chess%29 forking] with the moving piece, or at least by a single direct attack of the moving piece in conjunction with a [[Discovered Attack|discovered attack]]. The so called royal knight fork winning the queen is most important, but like other double attacks involving [[Check|checks]] already covered by usual move selection heuristics.
=Seeing Potential Forks=
