First, we look at the definition of the weak
Georg Mohr:
square:
A square is weak when it is controlled by
Bobby Fischer and the Square d5
your opponent and you have little or no
chance of regaining control due to a lack of
Robert James "Bobby" Fischer was an
pieces which can effectively fight for that
American chess grandmaster and the 11th
square. Typically, pawns that could have
World Chess Champion. He is considered
controlled the square have moved past it
by many to be the greatest chess player of
and, of course, cannot move backwards to
all time. A chess prodigy, at age 13 Fischer
help guard it. Single weak squares are
won a "brilliancy" that became known as
called  holes . Holes on the opponents half
"The Game of the Century". Starting at age
of the board that can be occupied by one of
14, he played in eight United States
your supported pieces are called
Championships, winning each by at least a
 outposts .�
point. At age 15�, he became both the
youngest grandmaster and the youngest
And now to the games. Let s allow Bobby
candidate for the World Championship up
to explain us some things!
to that time. He won the 1963 64 U.S.
Championship 11 0, the only perfect score
Fischer R. : Bolbochan J.
in the history of the tournament. His book
Stockholm 1962
My 60 Memorable Games, published in
1969, remains a revered part of chess
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6
literature for advanced players. (CB News,
5.Nc3 a6 6.h3 Nc6 7.g4 Nxd4 8.Qxd4 e5
March 2013).
9.Qd3 Be7 10.g5!
All chess players know his amazing
One of the most important characteristics
results, his fantastic technique, his
of the move is that it is not attack on the
positional mastery, f. e. playing with the
King, but forcing Knight out of the centre,
Bishops, especially light squared.
which allows White to increase control
I strongly recommend all trainers to study
over important d5 square.
Fischer s games. His My 60 memorable
10...Nd7
games� is one of the best chess
Knight has to stay in the centre, as on the
autobiographical books of all the time.
edge it is in danger 10...Nh5 11.h4ą
There we could easily find many well
& Be2.
known strategic elements, that we, as chess
11.Be3
trainers, have to study and know perfectly.
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For example weak squares. It was Bobby
who inspired us with his light square
9r+lwqk+-tr0
strategy and if we look even more deeper -
9+p+nvlpzpp0
with his master ship by controlling over the
extremely important square d5 in various
9p+-zp-+-+0
Sicilian variants. His opening setups were
in principle focused in the light square
9+-+-zp-zP-0
strategy: various Sozin variants (Bc4), with
9-+-+P+-+0
the plan f4-f5, which forced the opponent
to move e6-e5 (or to take e6-f5), or
9+-sNQvL-+P0
unusual variants with h2-h3, where his
9PzPP+-zP-+0
opponents in most cases did not recognize
that they are already deadly lost and of
9tR-+-mKL+R0
course did not know why this happened at
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all &
11...Nc5?
FIDE Surveys  Georg Mohr 1
It is possible to try some exchanges, but 21.f4
White would keep the advantage: Of course, Fischer did not fall into trap
11...Bxg5 12.Bxg5 Qxg5 13.Qxd6 Qe7 21.Nxe7+? Qxe7 22.Qxd6?? Rfd8 +.
14.Qxe7+ Kxe7 15.Nd5+ Kf8 16.0 0 0 21...exf4 22.Qxf4 Qd7 23.Qf5
g6� Kotov A. Very strong move, driving Queen from the
12.Qd2 Be6 13.0 0 0 0 0 14.f3 Rc8 centre.
23...Rcd8
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9-+rwq-trk+0
9-+-tr-trk+0
9+p+-vlpzpp0
9+-+qvlpzpp0
9p+-zpl+-+0
9p+-zp-+-+0
9+-sn-zp-zP-0
9+p+N+QzP-0
9-+-+P+-+0
9-+-+P+-zP0
9+-sN-vLP+P0
9+-+-+-+R0
9PzPPwQ-+-+0
9PzPP+-+-+0
9+-mKR+L+R0
9+K+R+-+-0
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15.Kb1
It is typical move, but it was possible to Very bad position aroused after 23...Qb7
start playing on the Kings side - 15.h4. 24.h5 Bd8 25.h6 g6 26.Qf4.
15...Nd7 24.Ra3!
Very interesting try is to start counter play Strong move, deflecting opponents Queen.
on the Kings side, despite the dangers 24...Qa7 25.Rc3
there: 15...f5 16.gxf6 Rxf6 17.Rg1 Rf7. Possible, but not the best was direct attack
16.h4 b5 17.Bh3 25.Nf6+!? Bxf6 (25...gxf6? 26.gxf6 Kh8
Interesting idea, but quite playable is direct 27.Qg5 Rg8 28.fxe7!) 26.gxf6 g6 27.Qg5
occupation of the central square d5 - Qf2; 25.h5 was playable and logical.
17.Nd5. 25...g6!
The position is quite clear: square d5 is Best defence, but did not help much.
fatal weak and white will use it as an 25...Qd7? 26.Rc7+ ; 25...Rd7? 26.Nf6+!
outpost for his pieces. The most important Bxf6 (26...gxf6 27.gxf6 Kh8 28.fxe7+ )
thing is that White always capture on d5 27.gxf6 g6 28.Qg5 Kh8 29.Qh6 Rg8
with the piece and not with the Pawn. 30.Rc8!+ .
17...Bxh3 26.Qg4 Qd7 27.Qf3 Qe6
To the loss of pawn led 17...Nb6 18.Bxb6 Not 27...Rc8? 28.Rxc8 Rxc8 29.Nb6.
Qxb6 19.Nd5 Qd8 (19...Bxd5? 20.Bxc8) 28.Rc7 Rde8
20.Nxe7+ Qxe7 21.Qxd6. Other possibilities: 28...Rd7 29.Nf4+ ;
18.Rxh3 Nb6 19.Bxb6! 28...Rfe8 29.Rf1; 28...Rc8 29.Ra7 Ra8
Bishop is not important - important is 30.Rxa8 Rxa8 31.Nc7.
control of the central square d5. We should 29.Nf4 Qe5 30.Rd5 Qh8
remember the way how it was played: with Yes, Queen in the corner was result of
the last moves he systematically removed Black s unlucky strategy and White s total
all black defenders of the square d5! control of the d5 square.
19...Qxb6 20.Nd5 Qd8 31.a3 h6
Better try was 20...Qb7 21.Rg3 f5 22.gxf6 Black would lose even faster with opening
Bxf6 23.h5. of the position 31...f6 32.Qb3 Rf7 33.Rxd6
FIDE Surveys  Georg Mohr 2
fxg5 34.hxg5 Qe5 35.Rf6! Ref8 36.Rxf7 Fischer Ro. : Reshevsky S.
Rxf7 37.Rc8+ Bf8 38.Ne6+ . New York 1962
32.gxh6 Qxh6
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Another way to lose immediately was
9rsnlwqk+-tr0
32...Bxh4? 33.Qg4 Qxh6 34.Rh5.
33.h5 Bg5
9+p+-+pvlp0
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9p+-zp-+p+0
9-+-+rtrk+0
9+-+-zp-zP-0
9+-tR-+p+-0
9-+-+Psn-+0
9p+-zp-+pwq0
9+NsN-+-+P0
9+p+R+-vlP0
9PzPP+LzP-+0
9-+-+PsN-+0
9tR-vLQmK-+R0
9zP-+-+Q+-0
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9-zPP+-+-+0
In his games Fischer was fighting strictly
for his favourite square. Let s look how he
9+K+-+-+-0
managed to confuse his all-time rival
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Sammy Reshewsky.
Or 33...g5 34.Nh3 Kh8 35.Ra7. 11.Nd5 Nxd5
34.hxg6! fxg6 Mikhail Tal later showed, that the better
Capture was calculated by Fischer very move was 11...0 0 and after 12.h4 f5 or
fast: 34...Bxf4 35.gxf7+ Rxf7 36.Rxf7 even 12...Nd7!? 13.Nxf4 exf4 14.Qxd6
Kxf7 37.Rh5!+ . Be5, acceptable was also 11...Nxe2
35.Qb3! 12.Qxe2 Be6, with the equal game. But not
With this piece sacrifice White conducted 11...Nxh3? 12.Be3 and Bb6.
mating attack. 12.Qxd5
35...Rxf4 This we know already: one always has to
35...Kh8 36.Nxg6+ Qxg6 37.Rxg5 Rf1+ take with the piece!
(37...Qxg5 38.Qh3++ ) 38.Ka2 Qxg5 12& Nc6 13.Bg4!
39.Qh3+ Kg8 40.Qxf1+ ; 35...Bxf4 This we also know: changing of light
36.Rh5+. square Bishop, defender of the d5 square.
36.Re5+ Kf8 37.Rxe8+ Kxe8 38.Qe6+ 13& Bxg4
Kf8 39.Qc8+ 1:0. 13...f5 14.gxf6 Qxf6 15.Bxc8 Rxc8 16.c3
Extremely instructive game. Systematic Rc7 17.Be3ą.
opening, then removing of the d5 square 14.hxg4 Qc8 15.Qd1
defenders (Bishop e6 and Knight b6), Double defence: the threat was Qg4 and
consolidation of the Knight on the d5 Nb4.
square and final attack. 15...Nd4
Better was 15...Qe6 16.Be3 0 0 0 (Tal).
16.c3 Nxb3 17.axb3 Qe6 18.Ra5! f6?
After a little bit better 18...b5, the pawn a6
became weak.
19.Qd5! Qxd5
19.Dd5 based on the good calculation:
19...Qxg4? 20.Qxb7 0 0 21.gxf6 +-.
20.Rxd5 Kd7 21.gxf6 Bxf6 22.g5 Be7
23.Ke2ą
FIDE Surveys  Georg Mohr 3
White had a big advantage in the ending, include the second rook in to the attack and
which he managed to win without Black defence will be soon or less broken.
problems. Weaknesses were Pawns on d6 Kg7 22.Ra1 f5
and h7, White was the Master of half This was not a counter play, because there
opened files and he had fantastic outpost was no target on the King s flank.
on d5. Enough? Sure, for Bobby & 23.exf5 Rxf5 24.Ra4 Rf8 25.Rc4 Qb8
26.Rcb4
Fischer R. : Badilles G. White easily won - 1:0.
Meralco 1967
Fischer R. : Kupper J.
1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 Z�rich 1959
5.Nb5 d6 6.Bf4 e5 7.Be3 a6 8.N5c3 Nf6
9.Bc4 Be7 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6
5.Nc3 d6 6.Bc4
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Bobby s favourite move.
9r+lwqk+-tr0
6& e6 7.Bb3 Be7 8.0 0 Nxd4 9.Qxd4 0 0
10.Kh1 b6
9+p+-vlpzpp0
This set up was recommended by famous
9p+nzp-sn-+0 Grandmaster Isak Boleslavsky.
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9+-+-zp-+-0
9r+lwq-trk+0
9-+L+P+-+0
9zp-+-vlpzpp0
9+-sN-vL-+-0
9-zp-zppsn-+0
9PzPP+-zPPzP0
9+-+-+-+-0
9tRN+QmK-+R0
9-+-wQP+-+0
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10.Nd5! 9+LsN-+-+-0
Removing of the first piece  defender.
9PzPP+-zPPzP0
Bad was 10& Ne4 11.Bb6.
10& Nxd5 11.Bxd5 0 0 12.Nc3 Kh8
9tR-vL-+R+K0
13.0 0 Be6 14.Bb3!
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Another piece  the Knight, is going to d5.
The most important thing is, that White has 11.f4!
one more attack to the square d5 than The plan with f4-f5 was Fischer s
Black. trademark. He liked to pressure pawn e6
14& Na5 15.Nd5 Nxb3 16.axb3 Bxd5 with Bishop from b3 and with Pawn from
17.Qxd5 f5 and forced Black to play e6-e5 or to take
Queen is the most power full piece on the e6-f5 and left the square f5 to the
outpost! She was proudly looking around opponent.
all the chess table. 11...Bb7 12.f5 e5 13.Qd3 h6?
17& Qc7 18.c3 g5? Black was afraid of Bg5, with the idea Bf6.
Black was afraid of the move f2-f4, but Interesting was 13...Rc8, with possible
White was thinking something completely exchange sacrifice on c3. Move h6 just
different. After 18& g5 black Bishop weakened the Black King position and
would become even worse. Bobby changed his planes in the moment 
19.Ra4 Rad8 20.Rb4 Rd7 21.Rb6! from positional chess to the wild attack!
The move paralyzed the opponent. The rest 14.Rf3! Rc8 15.Rh3 Kh7
of the game was simple, white has to
FIDE Surveys  Georg Mohr 4
The best chance for the Black was the 24.Qf3 Rc4 25.Qf5+
already mentioned exchange sacrifice: With 25& Kg8 26.fxg7+ . 1:0.
15...Rxc3 16.Qxc3 Ne4 17.Qe1 d5 18.c3
Bc5, but we remember Fischer also as a
player, who was never afraid of playing
with the material advantage.
16.Be3 Qd7
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9-+r+-tr-+0
9zpl+qvlpzpk0
9-zp-zp-sn-zp0
9+-+-zpP+-0
9-+-+P+-+0
9+LsNQvL-+R0
9PzPP+-+PzP0
9tR-+-+-+K0
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17.Nd5!
Things went forced by that moment. The
threat was 18.Nf6 Bf6 19.Bh6! gh6 20.Qe3
Bg7 21.f6.
17...Bxd5 18.Bxd5 Nxd5?!
A little better was to leave White Bishop
on d5 and wait for the slowly death &
19.exd5!
This was the exception: Bobby took on d5
with the Pawn! The reason was connected
with tactical play: there was f5-f6 in the air
and Black had only two logical defences.
19& Bf6?
Mistake, Black decided wrong. Better was
19...f6 and there was nothing after
20.Bxh6?! gxh6 21.Qe3 Qxf5 22.Qxh6+
Kg8 23.Rh5 (23.Rf3 Qh7 24.Rg3+ Kh8
25.Qe3 Rc4! 26.Rh3 Rh4 +) 23...Qxc2
24.Rf1 Rc4 +, probably Black was afraid
of this sacrifice. But Fischer never
sacrificed without clear win, so, he would
continue quietly 20.Rf1 Rh8 21.Rff3 Kg8
22.Rfg3ą. Now, there was final execution
left:
20.Bxh6! gxh6 21.Qe3 Bg7 22.f6! Rh8
23.Rf1 Qb5
Of course, not 23...Bf8 24.Qe4+ Kg8
25.Rg3+.
FIDE Surveys  Georg Mohr 5