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 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! 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 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 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 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! Eliskases vs Hoelzl, 1929  (D32) Queen's Gambit Declined, Tarrasch, 43 moves, 1-0 29...Bd5! combines clearance and interference to win Van Wely vs Kramnik, 1998  (D45) Queen's Gambit Declined Semi-Slav, 29 moves, 0-1 38...Rc3+!! Z Doda vs Portisch, 1969  (E60) King's Indian Defense, 39 moves, 0-1 41. Qd7! sets up 44. Ne5 +- S 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 Andersson, 1982  (A30) English, Symmetrical, 38 moves, 1-0 25. Rd7!! Wojtkiewicz vs S Skembris, 1990  (A13) English, 33 moves, 1-0 30...Nxf4! sets up a decisive obstruction to win the Queen L Ptacnikova vs Shulman, 2009  (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  (A57) Benko Gambit, 42 moves, 1-0 36. Rc6! Navara vs A Dergatschova, 2007  (D07) Queen's Gambit Declined, Chigorin Defense, 36 moves, 1-0 19...Ne4! Short vs Harikrishna, 2007  (C01) French, Exchange, 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, 22 moves, 0-1 30. h4! Qe5 31. Be6 +- Jakovenko vs 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 G 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 25. Ne4! S Fenil vs S Prathamesh, 2008  (B22) Sicilian, Alapin, 25 moves, 1-0 39...Bd4! solves Tuesday Dec 19, 2017 So vs Nakamura, 2016  (D37) Queen's Gambit Declined, 39 moves, 0-1 54 games