plik

FIDE Surveys – Adrian Mikhalchisin

Adrian Mikhalchisin:
Opening bluff

In chess sometimes appeared such situation,
when one of the players starts to play for win
at any price. In some cases it is possible to
do it from the early openings. We call such
way as BLUFF and the most brilliant figure
of this style weas great Mikhail Tal. He used
this method in different situations, but in the
openings he was successfull with this
method too.

Tal M. : Portisch L. B11
Bled 1965

1.e4 c6 2.Nc3 d5 3.Nf3 de4 4.Ne4 Bg4 5.h3
Bf3 6.Qf3 Nd7 7.d4 Ngf6 8.Bd3 Ne4 9.Qe4
e6 10.0–0 Be7 11.c3 Nf6 12.Qh4 Nd5
13.Qg4 Bf6 14.Re1 Qb6 15.c4?!
Normal way was quite possible here: 15.Qh5
g6 16.Qf3 Bg7 17.a4 a5 18.h4, with
attacking chances. But Tal decide to play
beautifully and dangerousely.
15...Nb4

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16.Re6!? fe6 17.Qe6 Kf8
Bad was 17...Be7 18.Bg6 hg6 (18...Kd8
19.Bf5 Qd4 20.Bf4 Re8 21.Re1) 19.Bg5 Qc7
20.Re1 Qd7 21.Qg6+–. But very good was

17...Kd8 and White has no more than
perpetual.
18.Bf4 Rd8
Did not help now 18...Re8 19.Bd6 Be7
20.Re1 Qd8 21.Re3.
19.c5 Nd3

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20.cb6?
Tal saw the line which led to draw: 20.Bh6
Qb2 (20...Qc7 21.Qf6 Kg8 22.Bg7) 21.Qf6
Ke8 22.Qe6 Kf8 23.Qf6.
20...Nf4 21.Qg4 Nd5 22.ba7 Ke7 23.b4
Ra8?
Slightly better would be 23...Kd6 24.b5 Kc7
25.Qg3 Rd6 26.bc6 bc6 27.Rb1.
24.Re1 Kd6 25.b5 Ra7? 26.Re6 Kc7
27.Rf6 1:0.

Christiansen L. : Foygel I. B15
USA 2002

In the next game it was performed very
similar idea.
1.e4 g6 2.d4 Bg7 3.Nc3 c6 4.Nf3 d5 5.h3
Nf6 6.Bd3 de4 7.Ne4 Ne4 8.Be4 Bf5 9.Bf5
Qa5 10.c3 Qf5 11.0–0 Nd7
11...0–0 was the simple alternative. 12.Re1
Re8 13.Bg5 (13.Qb3 is the typical method
again. 13...Qb5 14.Qb5 cb5 15.Bg5
provoking more and more weaknesses.
15...e6 16.d5 f6 17.Bh4 e5 18.Nd4±,
Velimirovic : Zivkovic, Svetozarevo 1990)

FIDE Surveys – Adrian Mikhalchisin

13...e6 14.Qd2 (14.Re5!? is very impressive,
but White cannot claim more than adequate
compensation for the exchange: 14...Be5
15.de5 Na6 16.Qd4 h6 17.Bh6 Rad8 18.Qh4
Qh5 19.Qf4 Qf5 20.Qh4 Qh5=, with only
repetition of moves, Palkovi : Barczay,
Hungary 1995) 14...Nd7 15.Bh6 Bh6 16.Qh6
Rad8 17.Re3 and Rae1, with the well-known
pressure on the e file. 17...Qf6 18.Rae1 c5
19.d5 e5 20.c4±, Loginov : Sandhu,
Oberwart 1997.
12.Re1 e6 13.Qb3 Qb5

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13...0–0–0 leads to more complicated
positions with opposite castled kings. 14.Be3
(14.a4 Bf6 15.a5 a6 16.c4 g5 17.d5!? ed5
18.cd5 Nc5 19.Qb6 Rd5 20.Qa7 Nd7 and
White's unprepared‚ is beaten back, Kochyev
: Zilberman, USA 1975) 14...Nb6 (14...h6
15.d5!) 15.c4. Now the Knight on b6 is
badly placed. 15...h6 16.a4˛ Bellin : Kusnir,
Haifa 1976.
13...b6 14.Qa3 is the next provocation.
14...a5 15.c4 and Black's « has been
successfully weakened. 15...Bf8 16.Qb3 Bb4
17.Re2 0–0 18.Bg5˛ Lobron : Gruenfeld,
Luzern 1979.
14.Re6?!
This sacrifice is far from correct! Logical
was natural 14.Qb5 and White could get
slightly better endgame, but IGM
Christiansen is in attacking mood! 14...cb5

15.d5 Nc5 16.de6 Ne6 (16...fe6 17.Nd4±)
17.Ng5.
14...fe6 15.Qe6 Kd8!
15...Kf8?? loses to 16.Bf4+–.
16.Bg5
16.Ng5 is also not enough: 16...Kc8 17.Nf7
Qd5! 18.Qd5 cd5 19.Nh8 Bh8 and White is
simply a piece down.
16...Kc8
Or 16...Kc7 17.Bf4 and then 17...Kc8.
17.Re1 Rf8
17...Qd5 18.Qd5 cd5 19.Re7 Rg8 was also
rather tempting!
18.Qe7

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18...Kc7??
Black overlooked terribly strong
intermediate move two moves later.
Black had logical winning idea: 18...Rg8!
19.Qf7 Qd5 20.Re8 Kc7!–+.
19.Qg7 Rf3 20.Re5!
Its is simply protecting Bishop g5!
20...Qb2 21.gf3 1:0.

Averbakh Y. : Tal M. A76
Riga 1958

1.d4 Nf6 2.c4 e6 3.Nc3 c5 4.d5 ed5 5.cd5
d6 6.e4 g6 7.Be2 Bg7 8.Nf3 0–0 9.0–0 Re8
10.Qc2 Na6 11.Bf4 Nb4 12.Qb1

FIDE Surveys – Adrian Mikhalchisin

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12...Ne4?!
Of course, this sacrifice is a bluff, but to
refute it,White has to calculate a lot and very
precisely and far.
13.Ne4 Bf5 14.Nfd2 Nd5

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Here is critical position where White has few
moves, but usually just one way is correct.
15.Bd6?
Other options were 15.Bg3 Qe7 (Euwe
found that Tal had another interesting option
15...Bh6 16.Bd3 (16.Qd3 Nb4 17.Qf3 Nc2;
16.f4 Bg7! with a lot of threats) 16...Nb4
17.Re1 Nd3 18.Qd3 d5–+) 16.Bb5 Be4
17.Ne4 Qe4 18.Be8 Qe8 19.Bd6 Qc6 20.Bg3
c4 it was Tals intention to play with the

exchange down. The best way was 15.Bg5
Qg5 16.Ng5 Bb1 17.Bc4 Bf5 18.Bd5 Bb2
19.Bf7 Kg7 20.Be8 Ba1 21.Bd7 Bd7
22.Ra1.
15...Nf6 16.Bf3 Ne4 17.Ne4 Be4 18.Be4
Qd6 19.Qc2 Re7 20.Bf3 Rae8 21.Rad1
Bd4 22.a4 b6 23.b3

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23...Re5!
With extra pawn and control over important
central file Black starts his attack.
24.Rd2 h5 25.Re2 Re2 26.Be2 h4 27.Kh1
Qf4 28.g3 Qf6 29.Qd1 Rd8 30.Bg4 Bf2
31.Qe2 Rd2 32.Qe8 Kg7 33.gh4 Qd4
34.Bh3 Qd3 35.Bg2 Rd1 0:1.

Averbakh Y. : Spassky B. E74
Leningrad 1956

In many cases after the opening one player
founds himself in very unfavourable
situation,that only help is to change situation
dramatically,even with the help of some
crazy sacrifices!
1.c4 Nf6 2.Nc3 g6 3.e4 d6 4.d4 Bg7 5.Be2
0–0 6.Bg5 c5 7.d5 Qa5 8.Bd2 a6 9.a4 e5
10.g4 Ne8 11.h4 f5 12.h5 f4 13.g5 Qd8
14.Bg4 Nc7 15.Bc8 Qc8 16.Nf3

FIDE Surveys – Adrian Mikhalchisin

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16...Nc6!!
Black is completely helpless, but this move
changes the course of the game
dramatically, what is not according to White
taste.
17.dc6 bc6 18.Nh4 Qe8 19.hg6 hg6 20.Qg4
Rb8 21.Nd1 Ne6 22.Ra3 Nd4 23.Rah3 Qf7
24.Bc3 Rfe8 25.R3h2 Qc4
Stronger was here 25...d5.
26.Ng6 Re6

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27.Bd4
Simpler would be 27.Rh8 Bh8 28.Rh8 Kg7
29.Rb8 f3 30.Nf4 ef4 31.Qf3.
27...Rg6 28.Qf5 Qe6 29.Qe6 Re6 30.Bc3 d5
31.f3 Rb3 32.Rh3 c4 33.Kd2 Rg6 34.Rg1

d4 35.Ba5 Bf8 36.Rg4 Rd6 37.Kc2 Rd7
38.g6 Rdb7 39.Be1 c5 40.Rgh4 Bg7 41.Ba5

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41...c3!
Suddenly Black longstanding inititive started
to give some results.
42.bc3 Ra3 43.cd4 ed4 44.Rf4 Ra2 45.Kd3
Rb1 46.Rh1 Ra4 47.Kc2 Rb5 48.e5 d3
49.Kd3 Rf4 50.Bc3 Rf3 51.Ke4 Rg3 52.Kf4
Rg6 53.Ne3 Rb8 54.Nf5 Rf8 55.Rh5 Re8
56.Ke4 Rg1 57.Rh3 Bf8 58.Kd5 Rd1
59.Ke4 Rc1 60.Kd5 Rd1 61.Ke4 Rd7
62.Nh6 Bh6 63.Rh6 Rh7 64.Rg6 Kf7
65.Rf6 Ke7 66.Rc6 Kd7 67.Rc5 Rh6
68.Kd5 Rb6 69.Ba5 Rb5 70.Rb5 ab5 71.e6
Re6 72.Kc5 Re5 73.Kb6
½.

Taimanov M. : Larsen B.      D37
Vinkovci 1970

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dc5
0–0 6.Bf4 Bc5 7.Nf3 Nc6 8.e3 d5 9.a3 Qa5
10.Rc1!? Be7 11.Be2 dc4 12.Bc4 Nd5!?
13.Bd5 ed5 14.Qb3!?

FIDE Surveys – Adrian Mikhalchisin

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14...g5!?
It is extremely dubious from positional point
of view try to change course of the game.
Larsen did not liked his position at this
moment.
14...d4?! 15.Nd4 Nd4 16.ed4±; 14...Rd8
15.0–0.
15.Bg3 g4 16.Nd4?
Taimanov was so surprised by the wrong
flank attack, that he lost the objective
evaluation of the position. Correct was
16.Ne5! Bf6 (16...d4 17.ed4 Nd4 18.Qd5
Qd8!) 17.Nc6 bc6 18.0–0.
16...Nd4 17.ed4 Bg5 18.0–0
Did not improve the position 18.Rc2 Re8
19.Re2 Re2 20.Ke2 Bd7.
18...Bc1 19.Rc1 Be6 20.h3!?
Of course Taimanov avoids Queens
exchange 20.Qb7 Qb6.
20...gh3
Wrong was try to swap the Queens
20...Qb6? 21.Qb6 ab6 22.hg4=.
21.Be5?! f6!
From here Larsens calculation is superb.
21...Qb6? 22.Nd5!
22.Ne4 fe5 23.Qg3

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23...Bg4!
It was necessary to see this beautiful tactics,
when both GMs started to calculate this line.
23...Kh8? 24.Qe5; 23...Kf7? 24.Ng5 Ke7
25.Qe5.
24.Qg4 Kh8–+ 25.Ng5 Qd2 26.Rc7
26.Rf1 hg2.
26...Qf2 27.Kh2 Qg2 28.Qg2 hg2 29.de5
Rac8 30.Rb7
Did not save the game 30.Rh7 Kg8 31.Rh6
Kg7 32.Rd6 Rf2.
30...Rc2 31.Nf7 Kg7 32.e6 Kf6 33.e7 g1Q
34.Kg1 Rg8 0:1.

Kortschnoj V. : Luther T.    E01
Essen 2002

This game is a brilliant example of forced
bluff and a mess which it creates!
1.d4 e6 2.c4 d5 3.Nc3 c6 4.Nf3 Nf6 5.g3
dc4 6.Bg2 Nbd7 7.0–0 b5 8.Bg5!? Bb7 9.a4
Qb6 10.Ne5 Ne5
Viktor Korchnoi: »There were two games
Romanishin : Sveshnikov, where the great
specialist of this position continued 10...Rd8.
In the second game (1999) white played
11.a5 Qa6 12.Nd7 Rd7 13.Bf6 gf6 14.Ne4
Be7 15.Qc1 and obtained some advantage.
Taking on e5 looks as the most natural
move, but presumably it has a clear
refutation ... (15.b4!?).«

FIDE Surveys – Adrian Mikhalchisin

11.a5?
Viktor Korchnoi: »I failed to guess what
Romanishin had in mind in this position. The
move is wrong. White had to play instead, as
I realized after long home work 11.de5 Nd5
(11...Nd7 12.Ne4) 12.ab5 Nc3 (12...cb5
13.Bd5 ed5 14.Nd5 Qc6 15.e4 Bc5 16.b4!
and black has problems to complete his
development) 13.bc3 cb5 14.Bb7 Qb7
15.Qd4 with white's advantage. Although
even now it is not clear to me, whether the
pressure of white is decisive, say, after
15...Qd7 16.Qe4 Qd5.«
11...Qa6 12.de5 Nd5 13.Ne4 h6 14.Be3
Viktor Korchnoi: »White has already burnt
the bridges some time ago, and this move is
fully in the spirit of his inflammatory tactics.
If 14.Nd2, then black, I believe, would not
have any problems to develop his pieces.«
14...Ne3
Viktor Korchnoi: »After 14...0–0–0 15.Bc5!
white would hinder black development for
long time.«
15.fe3 Rd8

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16.Qd8
Viktor Korchnoi: »Despair. And one might
say, not yet motivated. After 16.Qc2 Be7 (or
16...Rd5 17.Rf4 Re5 18.Raf1 f5 19.Qc3 Rd5
20.Nf6! - black has problems to defend his
highly compromized position) 17.Rf4 0–0

18.Nf6 white would have had strongest
attack.
16...Kd8 17.Rf7 b4
17...c3 was also playable.
18.Rd1 Ke8??
Simple winning move here was 18...Kc8.
19.Rdd7 c3
Chances for win were kept with 19...Bc8.
20.Nd6
Viktor Korchnoi: »At this moment I realized
that white is not losing, and making the
move I simultaneously offered a draw. Then,
a few seconds later, I grasped, that White has
more than a perpetual check, that black can't
avoid mate! 20.Nd6 Bd6 21.ed6 Qa5
22.Rfe7 Kf8 23.Rb7 and the only way to
escape mate is to play 23...Qb6, what
anyway would not save the game: 23...Qd8
24.Rf7 Kg8 25.Rg7 Kf8 26.Rbf7 Ke8
27.Bc6 ½.

Kramnik V. : Leko P.     A37
Dortmund 2013

1.c4 c5 2.g3 g6 3.Bg2 Bg7 4.Nc3 Nc6 5.Nf3
d6 6.0–0 e6!? 7.b3 Nge7 8.Bb2 0–0 9.e3
e5!? 10.d3 h6 11.a3 Be6 12.Nd2 d5! 13.cd5
Nd5 14.Rc1

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14...Nde7!
Correct way in this typical Maroczy
structure with reversed colours. Not

FIDE Surveys – Adrian Mikhalchisin

14...b6?! 15.b4!, with the idea of 15...cb4
16.Nd5 Bd5 17.Rc6.
15.Nc4 Rb8!
Not 15...Qd7?! 16.Ne4! b6 17.b4! and if
17...f5 18.Ned6.
16.Qe2
After 16.Ne4 b6 (the weakening of d6 is not
particularly important: White has nothing to
attack by his knights from this square) 17.b4
cb4 18.ab4 is answered by 18...b5!
16...b6 17.f4 ef4 18.gf4 f5 19.Rfd1?! b5!
20.Nd2 Qd7 21.Qf2 a6

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22.Nde4!?
In a strategically difficult position for him,
Kramnik decided to complicate matters. In
such situations bluff is always unpleasant for
the opponent, who waits for swift
developments in slightly better position.
22...Qa7?!
After accepting the sacrifice White would
not have objectively sufficient compensation
for a piece: 22...fe4 23.Ne4 Bb2 and if
24.Nc5 Qd6 25.Qb2 b4!? (but indeed a lot of
complex play would have still been ahead
there).
23.Nc5 Qc5 24.d4 Nd4 25.ed4 Qd6 26.d5
Bf7 27.Na2 Bb2 28.Qb2 Rfd8
Preferable was 28...Rbd8!?
29.Qd4 Rbc8
After 29...Qa3 White has 30.Nb4 a5
31.Na6!© attacking the b8 rook.

30.Rc8 Rc8 31.Nb4 Rd8= 32.Qa7!? Rd7
33.Qa6

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33...Qa6?
After this wrong exchange, Black finds
himself in a difficult ending. Black would
have been no worse after 33...Qc5!
34.Na6 Nd5
After 34...Bd5, one idea is 35.Nc5 Rd6 36.a4
ba4 37.Na4 and if 37...Bb3 (37...Kf7 38.b4)
38.Rd6 Ba4 39.h4.
35.Nc5 Rd8 36.Rd4 Kf8
Or 36...Rc8 37.Rd5! Bd5 38.Bd5±.
37.Nd3! Ke8 38.Ne5 Be6 39.Ng6

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Now White has extra pawn and not
complicated realization.

FIDE Surveys – Adrian Mikhalchisin

39...Rd7 40.Kf2 Rg7 41.Bd5 Rg6 42.Be6
Re6 43.Rd5 Ra6 44.Rf5 Ra3 45.Rb5 Kd7
46.Kf3 Kc6 47.Rb8 1:0.

Timman J. : Huebner R.    C10
Wolvega 2006

In modern chess exist tendency to prepare
bluff, a bit unsound line, but opponent has to
know it! Otherwise hell spend a lot of time
and doubtefully will find the correct
refutation.
1.e4 e6 2.d4 d5 3.Nc3 de4 4.Ne4 Nd7 5.Nf3
Ngf6 6.Nf6 Nf6 7.Bg5 c5 8.Bc4 cd4 9.0–0
Be7 10.Qe2 0–0 11.Rad1 Qb6 12.Rd4 Qb2
13.Bd3 h6

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Safer option would be 13...Rd8 14.Bf6 Bf6
15.Rd8 Bd8 16.Bh7 Kf8.
14.Bh6 gh6 15.Qe5! Qb6?
Black cracks under pressure and did not find
the best way: 15...Kh8 16.Nd2 Qb6
(16...Rg8 17.Ne4 Kg7 18.c3!) 17.Rh4 Rg8
18.Qf4 Rg7 19.Rh6 Kg8 20.Qh4 Kf8 21.Rf6
Bf6 22.Qf6 Bd7 23.Ne4 Bc6 and White has
just some compensation for exchange.
16.Rh4 Rd8

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17.Rh6
Even better would be 17.Qf4 Kf8 18.Ne5.
17...Kf8 18.Qg3 Ke8 19.Ne5 Qc7 20.Bb5
Kf8 21.Rh8 1:0.

Radjabov T. : Ivanchuk V. A37
Khanty-Mansiysk 2011

1.Nf3 c5 2.g3 g6 3.c4 Bg7 4.Bg2 Nc6 5.Nc3
e6 6.d3 Nge7 7.h4 h6 8.Bd2 b6 9.h5 g5

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9+-sNP+NzP-0
9PzP-vLPzPL+0
9tR-+QmK-+R0
xiiiiiiiiy

Radjabov had to win this game and he
decided from the start to create maximal
pressure,even on the cost of material.

10.Ng5!? hg5 11.Bg5 Bc3?

FIDE Surveys – Adrian Mikhalchisin

Black eliminates a dangerous knight, which
via e4 could go to d6 or f6. He also takes the
string out of h5–h6, but that comes at a high
price as now Black's squares are weak.
Ivanchuk is a great player, but here he made
a bad decision. 11...f6. IGM Zagrebelny
suggested 11...Bb7 12.h6 (12.Ne4 Qc7
13.Qd2 f5 14.h6 fe4 15.hg7 Rh1 16.Bh1
Qe5) 12...Be5!?
12.bc3 Bb7 13.Qd2! Qc7 14.Bf6 0–0–0
Black has serious problems with Black
squares here. He can't play 14...Rh7 in view
of 15.Be4 Ng8 16.Qg5 Nf6 17.Qf6 Qd8
18.Qd8 Nd8 19.Bh7 Bh1 20.f3+– and the
bishop is trapped.
15.0–0–0 Rhg8

XIIIIIIIIY
9-+ktr-+r+0
9zplwqpsnp+-0
9-zpn+pvL-+0
9+-zp-+-+P0
9-+P+-+-+0
9+-zPP+-zP-0
9P+-wQPzPL+0
9+-mKR+-+R0
xiiiiiiiiy

16.Bc6!
It is not positional idea-just pure
dynamical,as Black has problems with
recapture.
16...dc6?
Now the black bishop is closed forever.
After 16...Bc6 17.Be7 Rde8 18.Bg5 Bh1
19.Rh1 a bishop and two pawns are stronger
than a rook. 16...Nc6 does not help either -
17.h6 Rg6 18.Bd8 Qd8 19.h7 Qh8 20.Rh4,
with winning with the strong pawn h7.
17.h6 Rg6 18.h7 Rf6 19.h8Q Rh8 20.Rh8
Kd7 21.d4!

XIIIIIIIIY
9-+-+-+-tR0
9zplwqksnp+-0
9-zpp+ptr-+0
9+-zp-+-+-0
9-+PzP-+-+0
9+-zP-+-zP-0
9P+-wQPzP-+0
9+-mKR+-+-0
xiiiiiiiiy

Now it is time to open Black King.
21...Qd6 22.Qg5! Rf5 23.Qh4 cd4 24.Rd4
Rd5 25.cd5 Qa3 26.Kb1 cd5 27.Rh7 Qc3
28.Rf7 1:0.

Tal M. : Keres P.       C83
Moscow 1967

Bluff works not always and the biggest guru
of it had failed sometimes too!
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0–
0 Ne4 6.d4 b5 7.Bb3 d5 8.de5 Be6 9.Qe2
Be7 10.c3 0–0 11.Bc2 Qd7! 12.Rd1
Very risky was to accept pawn sacrifice
12.Be4 de4 13.Qe4 Bf5 14.Qe3 Rae8 with
strong pressutre in the center.
12...f5 13.Nbd2 Kh8!?
I would say, that it is small provokation from
Keres,as normal way would be.
13...Rad8.
14.Nb3
Very dubious would be 14.Ne4 fe4 15.Be4
de4 16.Rd7 ef3µ; but very interesting would
be attack of Black pawn chain. 14.a4 b4
15.c4.
14...Bf7 15.Nbd4
15.Nfd4.
15...Bh5

FIDE Surveys – Adrian Mikhalchisin

XIIIIIIIIY
9r+-+-tr-mk0
9+-zpqvl-zpp0
9p+n+-+-+0
9+p+pzPp+l0
9-+-sNn+-+0
9+-zP-+N+-0
9PzPL+QzPPzP0
9tR-vLR+-mK-0
xiiiiiiiiy

16.Nf5?!
Once more natural was 16.a4, but Tal wants
activity and decided to bluff, but Keres was
on alert!
16...Qf5 17.Rd5 Bg6 18.Qe3 Rad8 19.Rd8
Rd8 20.Nd4 Nd4 21.cd4 c5 22.d5 Qe5!
23.f3 Bg5 24.f4 Qd5 25.Be4
Of course Tal's decision to bluff was
supported by his wrong calculation. He
overlooked at the end of variation 25.fg5
Qd1 26.Bd1 Rd1.
25...Be4 26.fg5 Qd1 27.Kf2 Qc2
Simpler was 27...Rf8 28.Kg3 Qd6 29.Kh3
Bf5 30.g4 Bd3.
28.Qe2 Rf8 29.Ke1 Qa4 30.b3?
A bit better was 30.Be3.
30...Qd4 0:1.

Conclusion

After analyse of the above examples, we can
say that opening bluff is a powerfull
psychological and technical weapon.
Especially, when the time control is
becoming shorter.
Application of such method demands some
experience and knowledge plus bravery and
right moments. The most important feature
of it is huge pressure on the opponent, which
is very diffucult to survive. This method
does not guarantee automatic success, but

used correctly against some weakness of
opponents style and in some decisive
moments of the tournaments is
very effective.