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Obstruction
Compiled by patzer2
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More commonly used here in English is the term "Obstruction," but I use "Blockade" here because that is what ECO used in their Enclyclopedia of Middle Games to describe this tactic. The Blockade or Obstruction tactic occurs when players are forced to make a move or capture which blocks or obstructs their pieces from defending against their opponent's attack.

It is associated with the term "Obstruction Sacrifice" which is a sacrifice intended to blockade a square, file, rank or diagonal. As such it can be considered to be the opposite of a clearance sacrifice.

17...c5 -/+
Lasker vs Chigorin, 1895  
(D02) Queen's Pawn Game, 57 moves, 0-1

45...Qb6! sets up an amusing blockade for a draw
A Petrosian vs L Hazai, 1970 
(E80) King's Indian, Samisch Variation, 55 moves, 1/2-1/2

If 38. Bxd4, then 38...Bd2! leads to a quick mate
P Peelen vs Fedorowicz, 1990 
(A05) Reti Opening, 40 moves, 0-1

59...g5!
Kotov vs Botvinnik, 1955 
(D46) Queen's Gambit Declined Semi-Slav, 65 moves, 0-1

48...Ra3!
Kamsky vs Leko, 2008 
(A46) Queen's Pawn Game, 48 moves, 0-1

39. Nf5+!
N Kosintseva vs Zaiatz, 2009 
(C96) Ruy Lopez, Closed, 39 moves, 1-0

34. Rxd4!! Qxd4 35. Ne5 +- is even stronger than 34. Ne5 +-
Shirov vs J Smeets, 2010 
(C42) Petrov Defense, 37 moves, 1-0

33...Bd5!! would have made for a fantastic winning finish
Van Wely vs Shirov, 2010 
(A29) English, Four Knights, Kingside Fianchetto, 59 moves, 0-1

25...Bd3! or 24...Bd3! earlier
R Fuchs vs Korchnoi, 1965 
(B83) Sicilian, 27 moves, 0-1

28...Nc1! 29. Qc2 Nb3 -/+
Shabalov vs L Christiansen, 2010 
(E11) Bogo-Indian Defense, 43 moves, 0-1

30...Bc4! breaks communication between the two Rooks
Landa vs M Leon Hoyos, 2008 
(B47) Sicilian, Taimanov (Bastrikov) Variation, 46 moves, 0-1

25. Bb8! obstructs and attacks the Black Rook
D H Campora vs R Cifuentes, 2004 
(B31) Sicilian, Rossolimo Variation, 27 moves, 1-0

43...Bg3! obstructs the g-file and decoys the Rook for mate
R Wilms vs H Fraas, 2007 
(B12) Caro-Kann Defense, 45 moves, 0-1

22. Bd5!
B Kovanova vs N Pogonina, 2010 
(B50) Sicilian, 25 moves, 1-0

28. Nf6+!
E Eliskases vs C Bielicki, 1962 
(A04) Reti Opening, 41 moves, 1-0

20...e3! is the winning tactical shot Carlsen missed
Carlsen vs A Giri, 2011 
(D71) Neo-Grunfeld, 22 moves, 0-1

20. Ncd5!
Miles vs R Jamieson, 1992 
(A46) Queen's Pawn Game, 23 moves, 1-0

36. Qd6! Qc3 37. Qf6 +-
Judit Polgar vs Kaidanov, 2010 
(B78) Sicilian, Dragon, Yugoslav Attack, 10.castle long, 36 moves, 1-0

35. b5! +- breaks Rook coordination and puts two pieces enprise
K Akshayraj vs Le Quang Liem, 2008 
(B76) Sicilian, Dragon, Yugoslav Attack, 36 moves, 1/2-1/2

34. Ng5!
Speelman vs Short, 1980 
(E40) Nimzo-Indian, 4.e3, 34 moves, 1-0

23...Rxf3! sets up the final 27...Be1! & solves Wed 3/13/2013
W Schmidt vs R Henley, 1983 
(D44) Queen's Gambit Declined Semi-Slav, 27 moves, 0-1

33...b3! leaves the pinned Bishop no escape
Li Shilong vs Wang Yue, 2006 
(B33) Sicilian, 35 moves, 0-1

33...e2!
M Wei vs J Ikeda, 2013 
(B42) Sicilian, Kan, 37 moves, 0-1

41...Rxd2 42. Qxd2 Bxc5+! -+
Hjartarson vs Beliavsky, 1988 
(C95) Ruy Lopez, Closed, Breyer, 42 moves, 0-1

35...Nd2! solves Wed Jul 19, 2017
A Gavrilov vs B Grachev, 2007 
(D47) Queen's Gambit Declined Semi-Slav, 37 moves, 0-1

35...Re3!!
Kasparov vs I Nepomniachtchi, 2017 
(D90) Grunfeld, 37 moves, 0-1

29. Ne6! solves Sunday Dec 10, 2017
E Vladimirov vs G Agzamov, 1977 
(A07) King's Indian Attack, 33 moves, 1-0

17. Be4! is a follow-up to Sun Feb 4, 2018
Kaidanov vs D B Gurevich, 1997 
(A50) Queen's Pawn Game, 20 moves, 1-0

34. e6! solves Wednesday Apr 10, 2019
Bologan vs Rozentalis, 1998 
(C42) Petrov Defense, 35 moves, 1-0

34. Be5! solves Tuesday Jun 25, 2019
Miles vs C W Pritchett, 1982 
(D01) Richter-Veresov Attack, 34 moves, 1-0

30 games

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