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Interference or Obstruction
Compiled by patzer2
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Obstruction or interference involves breaking communications between pieces on a file or diagonal or Blocking a square, often with the sacrifice of a pawn or piece. In one sense, it is like throwing a wrench into the machinery of your opponent's position. It can be used to remove the protection for a piece, or it can be used to Block escape squares for a trapped King or piece. In another sense, it is the opposite of a clearance move.

See http://www.bu.edu/dbin/law/chess/in... and Wikipedia article: Interference (chess) for a discussion of the interference tactic. For now I'm using the term obstruction to refer to the same tactical theme.

15 e6! is a strong obstruction move
Grischuk vs G Seul, 2004 
(B09) Pirc, Austrian Attack, 22 moves, 1-0

16...Bb4+! exposes Karpov's King to "pursuit" attack
Karpov vs Judit Polgar, 2003 
(E12) Queen's Indian, 33 moves, 0-1

14...Bb5! (also "removing the guard" & "Interference")
A J Fink vs Alekhine, 1932 
(C44) King's Pawn Game, 14 moves, 0-1

28. Bxg6!! sets up 31. Rd8!!
R Beyen vs Filip, 1971 
(E20) Nimzo-Indian, 31 moves, 1-0

17...Bb8!
Smyslov vs Tolush, 1961 
(E10) Queen's Pawn Game, 17 moves, 1-0

20...Nd2!!
Beliavsky vs Nunn, 1985 
(E81) King's Indian, Samisch, 27 moves, 0-1

30. c4!
Judit Polgar vs Svidler, 2005 
(C89) Ruy Lopez, Marshall, 30 moves, 1-0

21...Bd4!
Rellstab vs Najdorf, 1950 
(E94) King's Indian, Orthodox, 25 moves, 0-1

19. Bg4! makes the Knight a decisive obstruction
Shirov vs S Erenburg, 2005 
(B12) Caro-Kann Defense, 38 moves, 1-0

34. d6! obstructs to create a strong double attack
Anand vs Shirov, 2005 
(C42) Petrov Defense, 35 moves, 1-0

30. Bc7! is stronger, forcing a quick crushing win
A Abolianin vs K Lie, 2004 
(A31) English, Symmetrical, Benoni Formation, 43 moves, 1-0

33. Bf8! is both an obstruction and clearance move
J Penrose vs C B van den Berg, 1952 
(C18) French, Winawer, 36 moves, 1-0

36...e4! creates a decisive double attack
Nakamura vs Beliavsky, 2005 
(D45) Queen's Gambit Declined Semi-Slav, 36 moves, 0-1

30. d5!
Eljanov vs R Bellin, 2005 
(A93) Dutch, Stonewall, Botvinnik Variation, 32 moves, 1-0

46...Nc5!
Ivanchuk vs V Moskalenko, 1988 
(C05) French, Tarrasch, 46 moves, 1-0

18. d5!
Jansa vs D Marovic, 1974 
(C03) French, Tarrasch, 21 moves, 1-0

34...Rf3! is poison and wins immdiately (pawn on f4 falls)
Kotov vs Botvinnik, 1939 
(E33) Nimzo-Indian, Classical, 38 moves, 0-1

35. Rxh6+! sets up 36. Rf6!
Psakhis vs A Volzhin, 1994 
(C78) Ruy Lopez, 39 moves, 1-0

24. Bc4!
B Savchenko vs N Vitiugov, 2006 
(B48) Sicilian, Taimanov Variation, 26 moves, 1-0

52. g6+!
Smyslov vs Flohr, 1949 
(B12) Caro-Kann Defense, 53 moves, 1-0

23. e6!!
Chandler vs H Olafsson, 1991 
(C86) Ruy Lopez, Worrall Attack, 35 moves, 1-0

39...Rg3!! 40. Bxg3 Nf5!
V Bogdanovski vs M Golubev, 1991 
(E97) King's Indian, 45 moves, 0-1

19...Nh3+!
M Shereshevsky vs Kupreichik, 1976 
(D05) Queen's Pawn Game, 19 moves, 0-1

25... Bf3! -/+ seems to win
A J Mestel vs Miles, 1979 
(B41) Sicilian, Kan, 43 moves, 0-1

43. Rd5!
E Eliskases vs F Hoelzl, 1929 
(D40) Queen's Gambit Declined, Semi-Tarrasch, 43 moves, 1-0

29...Bd5! combines clearance and interference to win
Van Wely vs Kramnik, 1998 
(D46) Queen's Gambit Declined Semi-Slav, 29 moves, 0-1

38...Rc3+!!
Doda vs Portisch, 1969 
(E60) King's Indian Defense, 39 moves, 0-1

41. Qd7! sets up 44. Ne5 +-
Zsuzsa Polgar vs G Timmerman, 1995 
(A81) Dutch, 45 moves, 1-0

31. Rf6!
Anand vs Bareev, 1993 
(C11) French, 31 moves, 1-0

19. Rf6!!
Fischer vs Benko, 1963 
(B09) Pirc, Austrian Attack, 21 moves, 1-0

19. Rf6! +/-
Tal vs Leonov, 1949 
(B13) Caro-Kann, Exchange, 25 moves, 1-0

17...Rf3!
Bird vs Blackburne, 1886  
(A02) Bird's Opening, 17 moves, 0-1

30...Re3!! sets up a winning attack on the White King
Anand vs Aronian, 2008 
(C89) Ruy Lopez, Marshall, 34 moves, 0-1

28. d6!!
G Sigurjonsson vs L Ogaard, 1978 
(B46) Sicilian, Taimanov Variation, 33 moves, 1-0

24. Bc4!
B Ivanovic vs Velimirovic, 1981 
(B76) Sicilian, Dragon, Yugoslav Attack, 33 moves, 1-0

25...Be3!
A Milnes vs D Crowe, 1989 
(C15) French, Winawer, 25 moves, 0-1

38. Nxe6!
Larsen vs Ulf Andersson, 1982 
(A30) English, Symmetrical, 38 moves, 1-0

25. Rd7!!
Wojtkiewicz vs Skembris, 1990 
(A13) English, 33 moves, 1-0

30...Nxf4! sets up a decisive obstruction to win the Queen
L Ptacnikova vs Y Shulman, 2008 
(C03) French, Tarrasch, 34 moves, 0-1

17. Re7! forces a quick mate
Maroczy vs Vidmar, 1922 
(C55) Two Knights Defense, 17 moves, 1-0

40. Qh2!
Spassky vs Korchnoi, 1955 
(D87) Grunfeld, Exchange, 41 moves, 1-0

46. Bd8! is number 365 in Informant's Middlegame encycopedial
Stein vs I Bilek, 1967 
(B27) Sicilian, 47 moves, 1-0

42. Re4! is categorized as interference by Informant
M Cuellar Gacharna vs Reshevsky, 1967 
(A56) Benoni Defense, 42 moves, 1-0

36. Rc6!
Navara vs A Dergatschova-Daus, 2007 
(D07) Queen's Gambit Declined, Chigorin Defense, 36 moves, 1-0

19...Ne4!
Short vs Harikrishna, 2007 
(C42) Petrov Defense, 19 moves, 0-1

39...Rc1! facilitates a winning passed pawn
Averbakh vs Korchnoi, 1965 
(A49) King's Indian, Fianchetto without c4, 39 moves, 0-1

20...Rd4!!
K Haznedaroglu vs J Isaev, 2010 
(C69) Ruy Lopez, Exchange, Gligoric Variation, 6.d4, 22 moves, 0-1

30. h4! Qe5 31. Be6 +-
Jakovenko vs I Nepomniachtchi, 2011 
(D85) Grunfeld, 33 moves, 1-0

40...Re5!
Kholmov vs Tal, 1963 
(B92) Sicilian, Najdorf, Opocensky Variation, 45 moves, 0-1

38...Bd4+!
Aronian vs Van Wely, 2014 
(A80) Dutch, 38 moves, 0-1

25...Ne5!
C Guillermo Poch vs A Planinc, 1971 
(D91) Grunfeld, 5.Bg5, 27 moves, 0-1

34. Rb5! solves a Friday puzzle
Grischuk vs B Grachev, 2017 
(B46) Sicilian, Taimanov Variation, 42 moves, 1-0

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