Interference (chess)

Example of interference
abcdefgh
8
a8 black rook
e8 black king
f8 black bishop
h8 black rook
a7 black pawn
b7 black pawn
c7 black pawn
e7 black pawn
f7 black pawn
h7 black pawn
c6 black knight
g6 black bishop
a5 black queen
d5 white knight
g5 white pawn
e4 black pawn
f4 white pawn
h4 white queen
e3 white bishop
g3 white knight
a2 white pawn
b2 white pawn
c2 white pawn
h2 white pawn
d1 white rook
f1 white rook
g1 white king
8
77
66
55
44
33
22
11
abcdefgh
In the Blackmar–Diemer Gambit, 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# and 20.Bxa5, winning Black's queen.[1]

In the game of chess, interference occurs when the line between an attacked piece and its defender is interrupted by sacrificially 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.[2] This definition may be expanded by including blocking moves that disrupt lines of defense.[3]

  1. ^ "My Best Move". Chess Life (May): 1–72. 2020.
  2. ^ George Huczek (2017). A to Z Chess Tactics. Batsford. pp. 001–349. ISBN 978-1-8499-4446-5.
  3. ^ Interference definitions and examples