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Vladimir Borisovich Tukmakov vs Viktor Korchnoi
USSR Championship (1970), Riga URS, rd 4, Nov-30
Nimzo-Indian Defense: Normal. Gligoric System Bronstein Variation (E55)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Mar-06-06  who: annotated at http://www.chessbase.com/newsdetail...
Jul-07-06  notyetagm: This game is a showcase for the tactical theme of <RELOADING>, that N defenders cannot keep out N+1 attackers.

Consider the position after 19 ... ♘bd5:


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White threatens the royal fork 20 ♘e5-g6+. This threat is met only by the Black f7-pawn <DEFENDING> this g6-forking square. But in addition to the White e5-knight, the White g3-rook and b1-bishop also threaten to occupy the g6-square. So White has -three- pieces that threaten to occupy the g6-square (e5-knight, b1-bishop, g3-rook) versus only -one- Black defender (f7-pawn) keeping them out of this square.

Since the Black f7-pawn must keep the White e5-knight out of g6, it cannot keep out either the White b1-bishop or g3-rook. So White plays 20 ♗g6!, with the idea that if this bishop is taken by 20 ... fxg6, then White will <RELOAD> on the g6-square with 21 ♘xg6+, winning ♕♙ for ♗♘.

After 20 ♗g6! ♗e8, the following position is reached:


click for larger view

The White d2-queen and c1-bishop both threaten to move to the h6-f8 diagonal by occupying the h6-square in turn. The only Black piece keeping these two White pieces out of h6 is the g7-pawn. But -one- Black defender (g7-pawn) cannot keep out -two- White attackers (d2-queen, c1-bishop). With 21 ♕xh6! White uses yet another <RELOADER>. White's idea is that if Black captures his queen with 21 ... gxh6, then he will <RELOAD> on the h6-square with 22 ♗xh6+, winning.


click for larger view

On the g6-square, -one- defender cannot keep out -three- attackers. On the h6-square, -one- defender cannot keep out -two- attackers. These two <RELOADER> examples exploit the one weakness of a pawn defender: even though a pawn is the best defender of a square since it has the lowest value, <a pawn defends a square -only- one time>. The Black f7-pawn defends the g6-square only one time. The Black g7-pawn defends the h6-square only one time.

Mar-15-07  simontemplar44: <notyetagm>, thank you for that instructive analysis of this game.
Apr-03-07  outplayer: According to Smyslov 20...Bc7! is a tougher defense. 20...Be8? is a mistake.
Nov-09-09  PAWNTOEFOUR: <who>...thanks for the link...<notyetagm> fantastic post,but then again,all your imput is greatly appreciated
Mar-02-12  master of defence: What happens after 21...gxh6?
Mar-09-12
Premium Chessgames Member
  OhioChessFan: 21...gxh6 22. Bxh6+ Kg8 23. Be4+

23...Ng4 24. Rxg4 Kg8 25. Bg7+ Kh8 26. Bf6+ Kf8 27. Bxe7+ which is a pretty easy win.


click for larger view

23...Kh8 24. Bg7+ Kg8 25. Bxf6+ Kf8 26. Bxe7+ and the same position.

Black's resignation might be quick at the club levle, but this is an easy win for a Super GM.

Apr-25-15
Premium Chessgames Member
  whiteshark: <OhioChessFan: <Black's resignation might be quick at the club levle, but this is an easy win for a Super GM.>>

Tukmakov who annotated this game in his biography* wrote:

"Kortschnoi managed to make his 40th move just before his flag fell, but that was little consolation. On <41...Ne2+>, there follows <42.Qxe2>, so of course. Black resigned. 1-0"

* Profession: Chessplayer - Grandmaster at Work, Russell Enterprises, 2012

Jul-18-16  clement41: nice tactics
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