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Interference (chess)
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{{Short description|Chess tactic}} {{Chess diagram |tright |Example of interference |rd | | | | kd| bd | |rd |pd|pd|pd| | pd|pd | |pd | | | nd | | | | bd | |qd| | | nl | | | pl | | | | | | pd |pl | |ql | | | | | bl | | nl | | pl| pl | pl | | | | |pl | | | | rl | |rl|kl| |In the [[Blackmar–Diemer Gambit]], [[Blackmar–Diemer Gambit#Vienna Defence|Vienna Defence]] after 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5 5.g4 Bd7 6.g5 Nh5 7.f4 g6 8.Be2 Bf5 9.Bxh5 gxh5 10.Qxh5 Qxd4 11.Nge2 Qd7 12.Be3 Bg6 13.Qh4 Nc6 14.Rd1 Qf5 15.Ng3 Qa5 16.0-0 Qb4 17.Nd5 Qa5, the interference move 19.Bb6 simultaneously threatens 20.Nxc7{{chessAN|#}} and 20.Bxa5, winning Black's queen.<ref>{{cite journal |title = My Best Move |journal = Chess Life |pages = 1–72 |year = 2020 |issue = May}}</ref> }} In the game of [[chess]], '''interference''' occurs when the line between an attacked piece and its defender is interrupted by [[Sacrifice (chess)|sacrificially]] [[Block (chess)|interposing]] a piece. It is a [[chess tactic]] which seldom arises, and is therefore often overlooked. Opportunities for interference are rare because the defended object must be more valuable than the sacrificed piece, and the interposition must itself present a threat. Huczek defines interference as a tactic involving blocking moves that obstruct lines of attack.<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> This definition may be expanded by including blocking moves that disrupt lines of defense.<ref>[http://www.chess.com/article/view/chess-tactics--definitions-and-examples#interference Interference definitions and examples]</ref> {{AN chess|pos=toc}}
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