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31 juillet 2011 7 31 /07 /juillet /2011 11:07

The zone defense

In zone defense, second and third defenders and midfielders are organised in two lines, in the transverse direction of the field, Sony VAIO VPCY218EC/G Battery

thus organising a defender line and a midfielder line, the midfielder line working as an "outer shield" for the defenders. The lines should be as straight as possible, although the first defender and in some cases the second defender may rush out of it to pressure the opponent with the ball. Sony VAIO VPCY218EC/L Battery

A straight line of defenders may prevent spaces behind some of them due to the offside rule. Also, even in zone defense, some opponents, for example those moving into dangerous space, may temporarily need to be marked. The man-to-man defense ideology holds that almost all opponents need to be marked at all times, Sony VAIO VPCY218EC/P Battery

although they will have to keep an eye on zone considerations as well, and usually a sweeper will be given a free defensive role. In practice, however, every defense will be a mix of zone defense and a man-to-man defense, although often with heavy leanings towards one or the other.Sony VAIO VPCY21S1E/L Battery

The number of players in the defender and midfielder lines is given by the number of football formations. Some formations use midfield anchors to stop attacks between the two lines. Attackers usually also play a role in pressurising defenders, in order to give them less time to find good passing alternatives.Sony VAIO VPCY21S1E/P Battery

The lines should be shifted sideways depending where the ball is. The third defenders should keep a sensible distance to each other, depending on the width the opponent's attacking players are distributed in.

Marlon defense

Each player in defense and defensive midfield has a zone of the pitch to protect. Sony VAIO VPCY21S1E/SI Battery

When the opposition attacks, where ever the other team drive the ball in attack,the sweeper doubles up with the man who is protecting that certain area. The sweeper is usually a decent enough centre back who has lots of energy.

Depth considerations

The distance between the defender line and the midfielder line should be kept constant at about 15 metres. Sony VAIO VPCZ110 Battery

However, the defensive line should back up and thus increase this distance, stand off, when there is no pressure on the opponent in possession, as this increases the possibility of a through ball. With tough pressure on the opponent, the distance may be reduced to below 15 metres. Sony VAIO VPCZ110GB/BI Battery

Also, as opponents move in close to the penalty area, the defending team will be forced to move their midfielders ever closer to their defenders.

When organised, the defending team will offer no resistance until the attacking team has advanced to a certain height on the pitch.Sony VAIO VPCZ112GD/S Battery

The pressure height, or at which depth the midfielders should start acting as first and second defenders, depends on a lot of factors. For example, as higher pressure is more tiring, it demands players with good stamina. In general, a defensive-minded team will tend to stay lower, thus diminishing defensive risks as opponents get less space. Sony VAIO VPCZ112GX/S Battery

This however, also gives them a longer way to the goal in the event of a break and counter-attack, making the long through ball a typical alternative.

The man-to-man defence

In a man-to-man defense system, a single defender follows his opponent wherever he goes. Sony VAIO VPCZ114GX/S Battery

Extremely tight marking can be achieved in this way and star players can often be neutralized in a game by use of a dedicated "shadow". Since the man to man defence will take defenders in any part of the field, interceptions and broken plays will often offer opportunity for quick counter-attack.Sony VAIO VPCZ115 Battery

The Italian teams of the 1970s and 1980s often used this approach with impressive results.

The weakness of the man to man defence is depth when fresh attackers move up. The man to man defence also allows defenders to be drawn out of position, opening gaps for other attackers in vulnerable areas. Sony VAIO VPCZ115FC/B Battery

This was Italy's fatal weakness in the 1970 Final, according to some analysts. To overcome this problem with depth, the man to man defense may use a 'sweeper', who is a central defender and has a free role, i.e. has not been assigned a player to mark. Sony VAIO VPCZ115FC/S Battery

He sometimes takes up a position slightly behind the other defenders, as his defensive role often is to 'sweep up' any attacks that break through the defence and as such he adds valuable depth to the defensive unit. Usually the sweeper will be the controller of the defence. Sony VAIO VPCZ116 Battery

They will determine where the back line should be at any given time. Zone defense does not require a sweeper role, and as many teams have changed their tactics to this, sweepers are today rare.

Free-kicks from short range

At free-kicks from short range, a wall of defensive players is lined up. Sony VAIO VPCZ116GX/S Battery

How many players should participate in the wall will depend on the angle and distance from the goal, and on the opponent's assumed shooting skills. The wall usually covers one end of the goal. The goalkeeper will be positioned nearer the other end of the goal, both because he then can see the ball when it's shot,Sony VAIO VPCZ117 Battery

and because it is more difficult for attackers to hit a powerful shot on target at the end that the wall covers.

Corner kicks and other crosses

At corner kicks, and at free-kicks or throw-ins that are likely to become a cross, most teams use man-on-man marking, even those which otherwise play zone defense. Sony VAIO VPCZ117FC/B Battery

Each player is given an opponent to mark, in advanced football they usually have been assigned an opponent before the match. Substituting at the time of a defensive set piece is regarded as unwise, as play may be started before the substitute has come into marking position.Sony VAIO VPCZ118 Battery

A few teams use the tactic of gathering defenders on one line on corner kicks and similar situations, in effect giving them the responsibility for zones instead of particular opponents.

Penalty kicks

In the case of a penalty kick, no defending players except the goalkeeper are allowed within the penalty area or within ten yards of the penalty spot.Sony VAIO VPCZ118GC/B Battery

A significant number of players should, however, be placed right outside the penalty area, alert to advance into the area and clear any deflection. For this purpose, sometimes the attacking team will nominate two players to run at the goal from either side of the penalty spot; Sony VAIO VPCZ118GX/S Battery

timing their run so that they only enter the penalty area once the kick has been taken will hopefully give them the first opportunity at gathering the ball if it is saved by the goalkeeper. This tactic is rarely seen, however, since the likelihood of the ball being saved and then falling into the path of the attacking player is small. Sony VAIO VPCZ119 Battery

A particular tactic that can be used by the goalkeeper involves trying to distract the penalty taker by drawing his concentration away from striking the ball cleanly. Such tactics normally involve moving one's body, or body parts, in an extravagant manner, or through verbal comments. Sony VAIO VPCZ119FJ/S Battery

Famous examples of where this worked successfully include Bruce Grobbelaar in the 1984 European Cup final, and Jerzy Dudek in the 2005 Champions League Final.

"Forward" versus "collapsing" defenses

Some teams use forward defending, aggressively challenging the ball when on the defensive in any part of the field. Sony VAIO VPCZ119GC/X Battery

Others rely on a "collapsing" style, that falls back deep into its own half when the opponent is in possession of the ball. The "forward" policy can put immense physical and psychological pressure on opponents, and is aimed at slowing down or breaking up attacks early. Sony VAIO VPCZ119L Battery

It has more physical demands however, and may spread a defensive formation more thinly. The "collapsing" approach is more economical in physical demand, and provides a packed back zone to thwart attacks. However it sometimes creates large gaps in midfield, and invites the opposing team to dribble forward and to take shots from long range;Sony VAIO VPCZ119R/B Battery

if the opposing team is good at the two aforementioned skills then goals will be conceded freely.

Defending with the ball

Clearing is when the player in possession of the ball is pressed hard, often near his own goal, and chooses to shoot the ball away with low precision simply in order to get out of a dangerous situation. Sony VAIO VPCZ119R/S Battery

When opponent pressure is extremely high, the ball is often cleared to a corner kick or to a throw-in. Clearing long, but into opponent control, may give the defence time and the opportunity to organize, including setting up the correct formation and pressure height.Sony VAIO VPCZ11AFJ Battery

If the attack was high up the field, such as in or near the penalty area, defenders will thus quickly push out, and attackers will then be forced to retreat in order to avoid offside in the next move. Clearing may be combined with an attempt to hit a long pass or a long through ball. Sony VAIO VPCZ11AGJ Battery

Players high up in the field who are pressed hard, and who are eager to avoid a counter-attack, may in some instances combine clearing with a shot.

A team composed of good passers and mobile players with good positioning skills may more often try to avoid clearing, as their skills make it easier to make shorter passes and thus retaining possession until they get out of a difficult situation.Sony VAIO VPCZ11AVJ Battery

Retaining possession in this way may also be regarded as a longer-term way of defending, as the opposing team cannot attack when they don't have the ball. With the ball, the team applying this tactic can simply pass the ball between each other - as in the possession football style, but with little or no intention of building up an attack, thus decreasing the risk of a break.Sony VAIO VPCZ11CGX/X Battery

The major benefits of this tactic is that the team is in complete control over its opponents. Meanwhile, by knocking the ball around, opponents playing the pressing game can easily tire. And should an opportunity suddenly arise, defence may be quickly switched to attack. Sony VAIO VPCZ11DGX/SJ Battery

A major downfall is that because the accuracy of passes needs to be high, short passes between the players are required. This significantly narrows the gap between the attack, midfield and defence (usually, the latter is forced to push up). So if the opponent gains possession, a long ball could effectively open up the defence. Sony VAIO VPCZ11FHX/XQ Battery

Similarly, if it is the attack and midfield that need to drop back, the team will have little chances of counter-attacking even if possession is won back.

Notable examples

Soccer coaches and technical manuals such as Soccer Skills and tactics, and The Soccer Coaching Bible, often use visual symbols and diagrams to demonstrate the principles described above, and to link principles to historical games. Sony VAIO VPCZ11V9R/B Battery

The following examples combine technical coaching observations with championship play descriptions at the World Cup level as in Brian Glanvile's World Cup, (1994).  The written descriptions are diagramed for the reader to better understand various soccer tactics and skills as they are applied in the real world, at the highest levels.Sony VAIO VPCZ11X9E/B Battery

Combined team play using width and depth: Brazil vs Italy, 1970 Final

Beating a defence using width and depth. Astute use of the principles of width and depth led to the final goal of the 1970 World Cup, considered by many to be the best combined team effort in Cup history. Sony VAIO VPCZ11Z9E/B Battery

Almost all the players of Brazil touched the ball in this effort that penetrated one of the tightest defenses ever seen, the famous Italian catenaccio "padlock" defence. The Italians used four defenders, plus a sweeper, Pierluigi Cera, behind the "back four". They relied on a counterattacking game, deploying 3 midfielders, and 2 strikers, and closely marked opponents man to man.Sony VAIO VPCZ125GX/S Battery

This tight system however involved a "collapsing" approach that while packing the Italian penalty area and denying the Brazilian forwards much space, left relatively large gaps in midfield. See "Standing Off" defensive discussion above. Brazil's superb skills exploited this weakness, showing especially that any defence Sony VAIO VPCZ127FC Battery

(whether man to man, zone or other variants) can be beaten using the principles of both width and depth. The weakness of the man to man system was also exposed. Italian left back Fachetti dedicated himself to winger Jairzinho, shadowing him tightly wherever he went. Jairzinho cunningly moved off the right flank,Sony VAIO VPCZ128GC Battery

opening gaps for others to follow as can be seen below. See "Switching the attack" and "Swapping wing men" above for discussion of this aspect of offensive tactics.

Italian defence pulled left in quick sequence. Brazilian midfielder Clodoaldo began the move with a weaving dribble out to the left flank, that beat 3 men and essentially pulled the Italian defence in that direction.Sony VAIO VPCZ12M9E/B Battery

A fatal gap was thus eventually opened up for the run of fullback Carlos Alberto on the right. Clodoaldo eased the ball to the Rivelino moving up on the left. Rivelino quickly played the ball forward to Jairzinho, who crossed the field to appear on the left flank.Sony VAIO VPCZ13M9E/B Battery

Movement in center "freezes" Italian defence. Almost without pause the powerful Jairzinho began a weaving run. Fachetti played Jair well, backing off the ball, and squeezing him inside where it was more crowded. Good defenders will "channel" (see discussion above) an attacker into areas with less space. Sony VAIO VPCZ13V9E/X Battery

So far, all seemed safe for Italy. Fachetti covered well, as did the other Italian defenders. There were 2 extra men as insurance in the back as Jairzinho began his run. Depth is also a principle of defence, and the sweeper system (or other arrangements) provides such.Sony VAIO VPCZ13Z9E/X Battery

As Jairzinho accelerated, the ever dangerous striker Tostao began a sprint up the middle, drawing his defender with him, diverting the Italian defence and making more room for Jairzinho. Younger players should note the movement off the ball by Brazil.Sony VAIO VPCZZZHJ Battery

Increasingly squeezed inside, Jairzinho's run nevertheless drew the defence to him and he eased the ball to Pele in the center. Always dangerous, Pele paused and shaped to make a dribble.

Overlapping defender exploits principle of depth to cap the move. For the Italian defence, there was still no cause for undue alarm. Sony VAIO VPZ117 Battery

Pele seemed well covered, and there was still the sweeper at the back as insurance behind the defence. Nevertheless, Pele's feint, combined with the previous moves, kept Italian focus frozen in the middle, attracting the attention of three men, and he casually slipped the ball right- to Carlos Alberto who was thundering up from the rear, totally unmarked.Sony VAIO VPZ118 Battery

Pele played the ball well ahead of Alberto, using space intelligently, so that the fast fullback ran on and shot without pausing, in full stride, smashing the ball into the Italian net. So effective was Brazil's use of width, that no Italian defender is even within reasonable striking distance of Alberto until the last moment. Sony VAIO VPZ119 Battery

The principle of width stretched and drew the Italian defence. The principle of depth—fresh men moving up from the rear—allowed Brazil to exploit the gaps created by width.

Penetration and envelopment in attack: Banks versus Pelé, Mexico 1970

Penetration in attack- the forward or through pass: Sony VPCM11M1E/B Battery

To the footballer, the penetration pass is one of the first methods learned in attack, whether it be the simple "kick and chase" of the youth leagues, or the exquisite through-balls by today's world class stars. Penetration by pass is the quickest method of advancing the ball towards the enemy goal. Sony VPCM11M1E/W Battery

When well executed, it can yield spectacular results. Penetration in attack however requires more than mere passing. Players without the ball must move into space, and must time their runs so as not to be caught offside.

Envelopment in attack: the central cross. Attacking an opposing side from the flanks using crosses from the wings is among the oldest and most effective football tactics. Sony VPCM12M1E/L Battery

An attack from the flanks leverages width, stretching an opposing defence, to create gaps in the goal area for exploitation. While the direction of the lateral cross is not as straightforward as the through-ball, both types of passes serve to split an enemy defence, in view of striking at the vital central area of the goal. Sony VPCM12M1E/P Battery

This example, the legendary confrontation between keeper Gordon Banks of England and Pele of Brazil, captures the two types of attack in one snapshot. It also serves to illustrate the difficulties in defending against both types of passes.Sony VPCM12M1E/W Battery

Two pass types - one great defensive save. The powerful running of Brazil's right winger Jairzinho set the stage, with initial direction by captain Carlos Alberto. Sprinting down the flank, Jairzinho pounced on an excellent through pass from Alberto, accelerated past Cooper the English back, and lofted a high arcing cross to Pele in the center. Sony VPCM13M1E/L Battery

Pele headed down powerfully and was already raising his arms in triumph when Banks leaped to his right "like a salmon over a fall" Pele said later, and somehow flailed the bouncing ball over the crossbar, saving a sure goal. The Brazilian forward said it was the greatest save he had ever seen, and many would agree.Sony VPCM13M1E/P Battery

Offensively, this play demonstrates how both types of passes can divide and stretch a defence. Jairzinho's running and cross was set up by an excellent forward pass, and his center to Pelé capped a move that should have resulted in a goal, were it not for the extraordinary skill of English keeper, Gordon Banks. Sony VPCM13M1E/W Battery

Offside traps are one way to defend against both pass types, but the ultimate solution is defensive depth and sound goalkeeping.

The two-man combination

Using the two-man combination. The 2-man combination pass, variously called the wall pass, the "one-two", the "give and go" and other local names, is among the simplest yet most powerful team techniques in football. Sony VAIO VGN-SR11M Battery

It requires a fair level of individual skill to pull off, yet this should not stop coaches from introducing it early in the higher youth leagues, nor should players from these leagues neglect it in favor of the all too easy "kick and chase". There are two ways to execute it: (a) pass and run to space for the return pass without pausing or (b) pass then pause briefly to gauge opposing reaction before running into an open spot for the return. Sony VAIO VGN-SR11MR Battery

In tight conditions, the first method is better, while the second can be used where there is a bit more space to operate.

Power of the two-man combination: Holland vs Brazil, 1974. Simple as it is, the 2-man move can penetrate the teeth of the densest, most negative opposition. Sony VAIO VGN-SR140D Battery

Peru brought it to a high art on the World Cup stage in 1970, under their coach Didi, Brazil's former midfield general of 1958 and 1962. Time after time Peruvian forwards like Cubillas, Gallardo, and Sotil put a central combination on the floor that sliced through the opposition and created countless dangerous situations. Sony VAIO VGN-SR140D/B Battery

The Dutch team of 1974 were also disciples of the two-man combination. The diagram here shows the first Dutch goal in the 1974 game that crushed Brazil's repeat championship hopes - product of an exchange between Johan Neeskensand Johan Cruyff. This one actually worked. Sony VAIO VGN-SR140D/P Battery

A two-man move also set up the second goal for Cruyff in the game. Contrast with the "hand" of Diego Maradona below.

Potential of the two-man combination: Maradona's "Hand of God" goal – 1986. The example shown below, the first goal of Diego Maradona against England in 1986, is used to illustrate the potential of the move. Sony VAIO VGN-SR140D/S Battery

Argentina utilized it frequently, being ideally suited to their crisp, quick, short passing style. As he had often done during the game, Maradona initiated the sequence with a quick dribbling run into the packed central area. Surrounded, he began a 2-man combo pass - slipping the ball to Jorge Valdano on the right, and then moving up for the reply.Sony VAIO VGN-SR140E Battery

Valdano pivoted and attempted to return, but conditions were too tight. Hodge, the English midfielder, intercepted and rather dangerously, attempted to tap the ball back to his keeper, Shilton. The rest is well known. Maradona and Shilton raced towards the floating ball, which connected with Maradona's hand (the so-called "Hand of God" goal), past Shilton, into the goal.Sony VAIO VGN-SR140E/B Battery

While much controversy still surrounds the goal, Maradona's run illustrates how even the tightest conditions can be pried open with the two-man exchange. It also illustrates how the simple two-man combination can create countless dangerous situations and force opponents into making errors.Sony VAIO VGN-SR140E/P Battery

The three-man move

Effectiveness of three-man strike teams. The three-man move is another very effective weapon in the attacking arsenal. It is distinguished from simple passing between players in that the initiator of the move finishes it with a shot on goal or a well-placed pass leading to a shot. It is thus a collaboration of three distinct players.Sony VAIO VGN-SR140E/S Battery

Famous three-man strike teams are legendary in football, from the earliest days, through the famous Hungarian sides of the 1950s, to the "clockwork orange" of the Dutch masters in the 1970s, through the German, Italian, French, Argentinian, Brazilian, and other teams of the contemporary era. Sony VAIO VGN-SR140N/S Battery

The three-man package can be more effective than the two-man combo because it gives more attacking options and causes more confusion in the defence. The initial pass cannot be quickly cut off as in the two-man maneuver which really has only one option.Sony VAIO VGN-SR165E/B Battery

Typically the second pass in the three-man move lures and diverts defenders on to false ground. This gives the initiator of the sequence time to run into an advantageous position. Triple player collaborations of course do not operate in isolation – they have other supporting players – but the tight three-man exchange still remains a fundamental pillar of successful attacking play.Sony VAIO VGN-SR165E/P Battery

Brazil vs Uruguay 1970 – strike package: Jairzinho – Pelé – Tostão. The example below, is drawn from one of the most famous strike teams in World Cup history- Pelé, Tostão and Jairzinho. This goal, against Uruguay in the 1970 semi-final, captures the power of the move. Sony VAIO VGN-SR165E/S Battery

The fast winger Jairzinho set the stage- dribbling down the right flank before finding Pelé ahead. Tightly marked, and with his back to the goal, Pelé immediately played a subtle pass to Tostão. The Brazilian center-forward drew the defence to him with a short dribble before finding Jairzinho again on the wing. Sony VAIO VGN-SR190EBJ Battery

This exchange of passes gave Jairzinho a lead on other defenders and he made the most of it – accelerating down the wing, selling a dummy (letting the ball run after pretending to stop and play it) on Uruguayan defender Matosas, and muscling him aside as he approached the enemy goal. Sony VAIO VGN-SR190EBQ Battery

Uruguayan keeper Mazurkiewicz came off his line but it was simply too late, as Jairzinho slotted the ball into the net. Of note in this sequence is the attacking space created by the tight exchanges between Jairzinho, Pelé, and Tostão. Even the Uruguayans, playing one of the most densely packed, negative defences seen in a World Cup could not stop it.Sony VAIO VGN-SR190EEJ/C Battery

Jairzinho is surrounded by enemy defenders when the sequence starts, but at the end, he only has one to deal with. Also of note is the unselfish passing of Brazilian striker Tostão, with his skill creating countless openings for his teammates throughout the 1970 tournament.Sony VAIO VGN-SR190NAB Battery

The quick counterattack

The quick counterattack requires intelligent running, exhaustive physical effort and good passing and dribbling skill. The diagram below shows a classic counterattack in the epic 1970, World Cup game—England versus Germany. Two passes, separated by a brief dribble yielded a goal. Sony VAIO VGN-SR190NBB Battery

English midfielder Alan Mullery started the move at almost the center of the field with a crucial pass, floating a long ball over three Germans, out to the right flank.

It was collected by Newton, a defender moving up form a deep position, and it quickly put him in excellent attacking position with few opponents to check his progress. Sony VAIO VGN-SR190NDB Battery

Newton advanced on a short dribble, before producing a low, outstanding diagonal cross that found Mullery who had sprinted into the goalmouth. Mullery finished what he had started, by ramming the ball home past the German keeper Maier. Tactically this goal combines the power of the long pass with that of the two-man combination,Sony VAIO VGN-SR190NEB Battery

and indeed, before his pass to Newton, Mullery had exchanged passes with Francis Lee before setting off on his final combination run.

Free-kicks and set-pieces

Indirect free-kicks can throw a defence into confusion when taken quickly, or in unexpected directions. Sony VAIO VGN-SR190NGB Battery

The third goal of Brazil's 1970 World Cup victory over Italy illustrates the method. Brazil's midfield general Gerson Nunes approached rapidly and lofted the dead ball in a high arc almost from the midfield line. It found Pele perfectly positioned near the Italian goal. Sony VAIO VGN-SR190PAB Battery

The Brazilian headed down softly and accurately, straight into the path of the onrushing winger Jairzinho, who virtually walked the ball into the net. Italy's catenaccio defence was caught out of position here, not only failing to neutralize Pele, but providing little cover to stop Jairzinho. Sony VAIO VGN-SR190PCB Battery

A rapid, daring set-piece kick will often accomplish this unbalancing of defences.

Direct free-kicks are a key part of attacking in football, and can lead to many goals. Numerous feints and ruses are tried to fool the opposition, including having attackers join the "wall." Sony VAIO VGN-SR190PFB Battery

A successful free kick from the 1970 World Cup- Brazil vs Czechoslovakia, illustrates how the technique works. Brazilian forwards Jairzinho and Tostao cunningly joined the end of the defensive wall as the Czechs set it up. As Pele backed off and feinted as if to take the kick, both Jair and Tostao began to move off, creating space. Sony VAIO VGN-SR19VN Battery

Roberto Rivelino ghosted in from the side to shoot powerfully into the gap for a goal.

Moving into space – the diagonal run

Moving into free space is one of the most critical skills that footballers must develop. Standing around to admire one's handiwork is unproductive effort. Sony VAIO VGN-SR19VN Battery

Attacking players must move off the ball into space to give an advance the maximum chance of success. Passes to space are feasible when there is intelligent movement of players to receive the ball and do something constructive with it. All the great players show an ability to find open gaps and seams in a defence- positioning themselves to receive a pass. Sony VAIO VGN-SR19VRN Battery

Smart use of space also causes confusion in a defence as multiple attacking options throw opponents off balance.

The diagram shown illustrates a very productive use of movement off the ball into space at the World Cup level, leading to a goal.Sony VAIO VGN-SR19XN Battery

Midfielder Rainer Bonhofmade a long diagonal run out to the right side of the field, that put him clear of the Dutch opposition. He was quickly found by Jürgen Grabowski, and Bonhof ran on untouched deep into the Dutch half, building up speed.Sony VAIO VGN-SR19XN Battery

He beat Dutch defender Arie Haan and centered to Gerd Müller, who pounced on the cross to slam it home for the German victory. Moving diagonally is one of the best offensive movements, whether at the near or far posts, or out to the wings further back in midfield. Sony VAIO VGN-SR210J/S Battery

Diagonal movement creates added space to maneuver, compared to simply running straight ahead.Sony VAIO VGN-SR21M/S Battery,Sony VAIO VGN-SR21RM/H Battery,Sony VAIO VGN-SR21RM/S Battery

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