Editing Castling (section)

===Tactics involving castling===
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Tactical patterns involving castling are rare. One pattern involves castling queenside to deliver a {{chessgloss|double attack}}: the king attacks a rook (on b2 for White or b7 for Black), while the rook attacks a second enemy piece (usually the king). In the example shown, from the game [[Hermanis Matisons|Mattison]]–Millers, Königsberg 1926,<ref>{{cite web |url=https://www.chessgames.com/perl/chessgame?gid=1621031 |title=Mattison vs. Millers, Königsberg 1926 |website=[[Chessgames.com]] }}</ref> Black played 13...Rxb2{{chesspunc|??}} and resigned after 14.0-0-0+, which wins the rook.

Chess historian [[Edward Winter (chess historian)|Edward Winter]] has proposed the name "Thornton castling trap" for this pattern, in reference to the earliest known example, Thornton–Boultbee, published in the ''Brooklyn Chess Chronicle'' in 1884. Other chess writers such as [[Gary Lane (chess player)|Gary Lane]] have since adopted this term.<ref>Edward Winter, [https://www.chesshistory.com/winter/winter53.html#5914._Euwe_and_Alekhine_C.N._5907 C.N. 5916 – 'Thornton castling trap' (C.N. 4078)], 27 December 2008</ref>
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Another example of tactical castling is illustrated in the diagrammed position from the [[correspondence chess|correspondence]] game Gurvich–Pampin, 1976. After 1.Qxd8+ Kxd8 2.0-0-0+ Ke7 3.Nxb5, White has won a rook by castling with check and simultaneously [[Pin (chess)|unpinning]] the knight.<ref>{{cite book | author = George Huczek | title = A to Z Chess Tactics| publisher = Batsford | isbn = 978-1-8499-4446-5 | pages = 001–349 | year = 2017 }}</ref>
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Such a double attack can also be made by castling kingside, although this is much rarer. In this position from the blindfold game {{nowrap|[[Sergey Karjakin|Karjakin]]–[[Magnus Carlsen|Carlsen]]}}, 2007, the move 19...0-0 threatens to win the rook on h7, as well as 20...Bxg5, when White cannot recapture due to the threat of [[back rank mate]]. Black will thus win the g5-knight next move; 20.Rh6 Bxg5 21.Rxg6+ Kh7 22.Rxg5 would not work, as it would be met by 22...Rf1{{chessAN|#}}.<ref>Tim Krabbé, [https://timkr.home.xs4all.nl/chess2/diary.htm Open chess diary], item 391</ref>
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