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Alexander Onischuk vs Alexey Shirov
Aerosvit (2008), Foros UKR, rd 11, Jun-19
Queen's Gambit Accepted: Classical Defense. Main Lines (D27)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Jun-19-08  luzhin: Lovely final move by Shirov. Neither rook nor queen can be captured (30.Nxc8 Qxd5)and after 30.Bd3 Rc1+ 31.Bf1 Qxe7 32.Qd3 Qe6 White has no chance.
Jun-19-08  Marmot PFL: 28. Rxd7? is hard to explain. Nxd5 was forced.
Jun-20-08  notyetagm: Position after 29 ♕d2x♗d5: 29 ... ?


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Here Onischuk (White) was counting on the tactical point that the <UNDEFENDED> Black a8-rook was hanging to his White d5-queen to <INDIRECTLY DEFEND> his White e7-knight (i.e., 29 ... ♕d6x♘e7?? 30 ♕d5x♖a8).

But the tactical wizard Shirov (Black) played a much stronger move, 29 ... ♖a8-c8!, forcing White's instant resignation.

Position after 29 ... ♖a8-c8! 0-1


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Black has just moved his <UNDEFENDED> Black a8-rook away from the White d5-queen <WITH TEMPO>, by threatening mate on the c1-square (<WEAK BACK RANK>). Because the Black rook now threatens a <SNAP MATE> with 30 ... ♖c8-c1+, White does not have the time to save his White e7-knight which is no longer protected by the <INDIRECT DEFENSE> mentioned above. <<<The <UNDEFENDED> Black a8-rook was able to move with a <GAIN OF TIME> by threatening mate, meaning that White could -NOT- depend on it being <UNDEFENDED> on the a8-square to <INDIRECTLY DEFEND> the White e7-knight.>>> The Black a8-rook was able to <MOVE FOR FREE> due to the <TEMPO> of the <MATE THREAT>.

Onischuk no doubt saw this idea of the <UNDEFENDED> Black a8-rook <MOVING FOR FREE> away from his White d5-queen but probably overlooked that 29 ... ♖a8-c8! was -STILL- possible even though the White e7-knight -APPEARS- to <DEFEND> the c8-square because the White e7-knight has the more important task of <DEFENDING> the White d5-queen from the threat of 30 ... ♕d6x♕d5.

So Shirov's masterly 29 ... ♖a8-c8! uses a <MATE THREAT> to <GAIN TIME> to move his <UNDEFENDED> Black a8-rook <FOR FREE> onto the c8-square which only <APPEARS> to be <DEFENDED> by the White e7-knight but is not actually <DEFENDED> because the White e7-knight is <OVERWORKED>.

Jun-20-08  notyetagm: Black to play: 29 ... ?


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Shirov's 29 ... ♖a8-c8! wins on the spot.

Position after 29 ... ♖a8-c8!


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Now White must meet the threat to his <WEAK BACK RANK> and thus cannot spare the time to save his <UNDEFENDED> White e7-knight.

<luzhin: Lovely final move by Shirov. Neither rook nor queen can be captured (30.Nxc8 Qxd5)


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and after 30.Bd3 Rc1+ 31.Bf1 Qxe7 32.Qd3 Qe6


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White has no chance.>

Jun-20-08  notyetagm: Black to play: 29 ... ?


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From IM Dennis Monokroussos at http://chessmind.powerblogs.com/fil...:

<White would be in decent shape, were it not for the following shot.

29...Rc8! The end.


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[29...Rc8! 30.Bd3 Rc1+ 31.Bf1 Qxe7 ]


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0-1>

Aug-10-08  ravel5184: I think a lot of <notyetagm>'s collections have the same general meaning, such that the list of collections he has to go through when adding one game is HUGE. For instance, Game Collection: Defending one square is a full-time job, Game Collection: Overworked and even Game Collection: Obligation means -APPARENT- control of squares, all of which have this game in them, have the same meaning, and can be replaced by one big collection, with a name like "Obligation restricts mobility" or "#pieces < #threats? Not good", or something along those lines. And the same is true for most of the rest of his collections.
Dec-22-08  notyetagm: <ravel5184: <I think a lot of <notyetagm>'s collections have the same general meaning, such that the list of collections he has to go through when adding one game is HUGE. For instance, Game Collection: Defending one square is a full-time job, Game Collection: Overworked and even Game Collection: Obligation means -APPARENT- control of squares, all of which have this game in them, have the same meaning, and can be replaced by one big collection, with a name like "Obligation restricts mobility" or "#pieces < #threats? Not good", or something along those lines. And the same is true for most of the rest of his collections.>>

True. I usually make an entry into whatever game collection strikes me at the time.

Nov-27-09  notyetagm: Onischuk vs Shirov, 2008

29 ... ?


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How does Black deal with the threat of 30 ♕d5x♕d6 ?

29 ... ♖a8-c8! 0-1


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29 ... ♖a8-c8! is still the best example of what I have come to call the <AVERBAKH RULE>:

The White d5-queen is *not* attacking the <UNDEFENDED> Black d6-queen because it is not White's move. Instead it is the Black d6-queen which is attacking the 1-1 <LOOSE> White d5-queen, meaning that the White e7-knight defender is <OVERLOADED> controlling both the d5- and c8-squares, hence 29 ... ♖a8-c8!.

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