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John Nunn vs Gennadi Sosonko
Interpolis 6th (1982), Tilburg NED, rd 1, Sep-30
Caro-Kann Defense: Advance Variation. Van der Wiel Attack (B12)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Apr-12-09  WhiteRook48: 18 Bxd5 is forced
Mar-27-12  DrChopper: Seriously, I don't see what can do white after: 18.Bxd5 Qxg3+ 19.Kh1 Qxh3+ 20.Kg1 Nxg4

If 21.Qf4 then Bd6.

Mar-27-12
Premium Chessgames Member
  Sastre: <DrChopper> 18...Qxg3+ 19.Bg2 .
Apr-03-12  DrChopper: Ah you're right! lol Great combination by Nunn.
Jun-16-13
Premium Chessgames Member
  pilobolus: Can't 18. Be2 capture black Queen?
Jun-16-13
Premium Chessgames Member
  pilobolus: I am sorry I see the pin now.
Jun-16-13  JoergWalter: Nunn vs Sosonko, 1984

is another beautiful miniature by Nunn against Sosonko.

Jun-16-13
Premium Chessgames Member
  al wazir: Son of a gun! I solved it! That goes some way toward making up for all the games of 5-minute chess I lost today.
Jun-16-13  morfishine: I don't see White forcing mate or winning decisive material or achieving a decisive positional advantage after <18...Qxd5> despite the hole at d7
Jun-16-13  Absentee: Got it.
Jun-16-13  Willber G: Solved it, first Sunday of the year! (But I thought it was easier than Friday...)

<morfishine: I don't see White forcing mate or winning decisive material or achieving a decisive positional advantage after <18...Qxd5> despite the hole at d7>

I think 19.R(a)d1 is enough.

Jun-16-13  morfishine: <Wilbur G> You commented <I think 19.R(a)d1 is enough>

After 18.Bxd5 Qxd5 19.Rad1 Qe5 20.Rd7+ <20...Kf6> I don't see an immediate win for White, though he's up an exchange; Meanwhile, Black has some annoying threats like Qxg3 and Ra8

18...exd5 opening the e-file has to be much worse

Jun-16-13  James D Flynn: Material is equal but Black has threats that require attenti is answered by Bxf2 on: 18dxc4 and far more serious 18..Qxg3+. The N on g3 cannot be defended: 18.Kh2 is answered by Bxf2 renewing the threat on the N. The N has only 3 squares for retreat h1, h5, and e2 all allow 18.Be4 when the mating threats 19Qg2# and Qh1# are unanswerable. Perhaps sacrificing the Nf5+ blocking the B from e4 may work. 18.Nf5+ exf5 19.Rae1+ Kd8 20.Bxd5(not 20.Nc6+bxc6 21.Qa8+ Kc7 22.Kd6 and White runs out of useful checks) Qg3+ 21,Bg2 and no w the Black K is stuck in the centre exposed to the combined attack of the R on e1 the Q the N on a7 and if he ever stray back to the e file, the R on f1. That is all have time for, but clearly after 18,Nf5+ Black should take with B or N rather than pawn.
Jun-16-13  Patriot: White is currently up a rook, while the c5-bishop and g3 knight hang. After looking at this for a while, 18.Bxd5 seems the only reasonable candidate to gain time.

18.Bxd5

18...Qxg3+ 19.Bg2 seems better for white.

18...Qxd5 - I'm not sure what's next here. 19.Rad1 Qf3 and I think white has some problems since 20.Qd7+/Rd7+ Kf6. Perhaps 20.Kh2 is key here.

18.Bxd5 is my move.

Jun-16-13  Patriot: This is one of those rare instances where knowing the initial material count makes a huge difference in knowing which candidates are reasonable. For example, with even material 18...Qxg3+ 19.Bg2 is not so great for white.
Jun-16-13
Premium Chessgames Member
  An Englishman: Good Morning: I found the main line, but thought that White had secured a draw, not a win. Can only claim .5 for the Sunday madness, and 6.5/7 for the week.
Jun-16-13  RandomVisitor: Perhaps white missed an earlier win, after 15...Ke7, 16.Qb5!


click for larger view

Rybka 4.1 x64:

[+2.54] d=15 16...Bd6 17.Bxc4 Bxg3 18.Qxb7+ Kf6 19.Rf1 Bf4 20.Nc6 Ng8 21.Qc8 Ne7 22.Qxh8 Nxc6 23.Be2 Be4 24.Qc8 Ne7 25.Qc5 Ng6 26.Kd1 Bg2 27.Rg1 Qxh3

[+3.47] d=15 16...Bxa7 17.Qxb7+ Kd6 18.Qxa7 Rc8 19.a4 Ne5 20.Bb5 Qd8 21.0-0 Nf3+ 22.Kg2 Ra8 23.Qe3 Nh4+ 24.Kh2 Ke7 25.Qg5+ Kf8 26.Qxd8+ Rxd8 27.f4

Jun-16-13
Premium Chessgames Member
  chrisowen: Indeed a mere doddle compared echelon nag kin up,

black sacrifices g4 to his advantage so throttle d5 first see hod carrier f3 light has covered check g3,

for I debonair 18.Bxd5 free be effective eg blow giving bad medicine to swallow as tedious again cruise a wave seen nearly came off fervious surf,

and turf a g3 enact work creep?? Rook it eyes h-,

colomn so a king advised to stay put black's pieces,

look down on him give a included 18...exd5 faith have clop another f3 takes horse also d5 will come,

back to defeat g2 marvel light has rook pawn to,

boot. Sigh see hub for heading o business 18.Bxd5 exd5 go off tender f3 out of range might you have,

rooks aid a amorphous 19.rae1+ hoofed in etc a lie,

light a press e1 forth ground a battlings 19...Kd8,

affable dilemma I negateful 19...Kf6 as trapped e3 wins the queen is trivial free delve in 20.nc6+ hive mind combine seek up c7 hall i seed grail at sight good 20...Kc7 spring trap be a 21.nd4 white blip a king secure in also pawn up bagged it don't fool me. A light flap cc engage win none for having,

rooke1 line it book in a bit rook schematic call,

afternoon 20.Kh2 question to abound 20...Nxg4+ down away also a kindred gauge to a 21.hxg4 h5 22.nc6+,

na ledge d8 up tie a knights 22...Kc7 23.nd4 flip script assume lead in got 23.hxg4+ calf requested,

at ignoble mission it he bine 24.Kg1 blockade duty,

ramble you formulate a wave erstwhile apostle give d5 I support host feed electric a1 e1 strike nit-

pick right 13th acorn it down nc4??

Jun-16-13  torro: why not simply 18...Qxg3+???
Jun-16-13  Patriot: <torro> <why not simply 18...Qxg3+???> Because 19.Bg2 leaves white with a big material advantage.
Jun-16-13  devere: 18.Bxd5! saves White. Aside from the game continuation there is 18...Qxg3+ 19.Bg2, and 18...Qxd5, 19.R(a)d1, Qf3, 20.Rd7+, and now on either Kf6 or Kf8, 21.Kh2 works for White since Black cannot capture on f2 with his Bishop without a fatal Queen check by White.
Jun-16-13
Premium Chessgames Member
  agb2002: White has one rook, one bishop and one knight for the bishop pair.

Black threatens 18... Qxg3+ 19.Kh1 Be4+ 20.f3 Qxh3# and 18... dxc4.

The first idea that comes to mind is 18.Bxd5:

A) 18... Qxg3 19.Bg2

A.1) 19... Ra8 20.Qb5 (20.Rad1 Rxa7 21.Qd7+ Kf6 - +; 20.b4 Be4 - +; 20.Nc6+ bxc6 21.Qxa8 Be4 - +)

A.1.a) 20... Bxa7 21.Qxb7+ Kf6 22.Qxa8 + -.

A.1.b) 20... Rxa7 21.Qxc5+ Qd6 22.Qxa7 + -.

A.1.c) 20... b6 21.Qxc5+ bxc5 (21... Qd6 22.Qxd6+ Kxd6 23.Bxa8 + -) 22.fxg3 Rxa7 23.a3 + -.

A.1.d) 20... Qc7 21.Nc6+ (21.Qxb7 Qxb7 22.Bxb7 Rxa7 23.Bf3 should also win) 21... bxc6 (21... Kd6 22.Rfd1+ mates in two) 22.Qxc5+ Qd6 (22... Kf6 23.g5#) 23.Qxd6+ Kxd6 24.Rfd1+ + -.

A.2) 19... Nxg4 20.hxg4 h5 21.Qb4 Qc7 (21... Qxg2+ 22.Kxg2 Bxb4 23.cxb4 + -) 22.Qxb7 + -.

A.3) 19... Rd8 20.Qb4 as in A.2.

B) 18... Qxd5 19.Rad1

B.1) 19... Qf3 20.Rd4 blocks the diagonal but it's unclear.

B.2) 19... Bd3 20.Rxd3 Qxd3 21.Ne4 with the double threat 22.Nxc5 and 22.Rd1.

C) 18... exd5 19.Rae1+

C.1) 19... Be4 20.Nxe4 dxe4 21.Rxe4+ looks winning.

C.2) 19... Kd6 20.Nb5+ and 21.Nd4+ wins the queen.

C.3) 19... Kd8 20.Nc6+ Kc7 (20... bxc6 21.Qa5+ grabs Black's dsb) 21.Nd4 looks advantageous for White.

I have considered other options but they don't look as active as 18.Bxd5.

Jun-16-13  M.Hassan: "Insane"
White to play 18.?
White is up by a Rook.

If it were Black's move:
<1...Qxg3+ 2.Kh1 Qxh3+ 3.Kg1 Nxg5 and mate next move by Qh2#>

So, White has to make a move to prevent mate:

18.Bxd5
<if...Qxg3+ 19.Bd2 and mate no longer is possible>

18..........exd5
19.Kh2 Bxe2
20.Rae1+

A) 20..........Kf6
21.Nh1 with a threat of next Rxf2 and capture the pinned Queen. 21..........Qd3 run away before it is captured
22.Qf4+ Bf5
23.Qxf2 g6
24.gxf6 Nxf6
25.Ng3
And White is much better.

Another variation:
B) 18.Bxd5 exd5
19.Rae1+ Kd6
20.Nb5+ Kc5 or d5
21.Nd4+
And picks up the Queen next

Third Variation:
C) 18.Bxd5 exd5
19.Rae1+ Kd8
20.Qa5+ Kd7
21.Qxc5
Now, Black's threat of mae is gone and White threatens mate by <22.Re7+ Kd8 23.Qc7#> 22.........Qf6
23.Qxd5+ Qd6
24.Qxb7+ Qd7
25.Re7+ Kxe7
26.Qxc7
1-0
time to check

Jun-16-13  BOSTER: <Sneaky>
<Games aren't just won by launchig sound attack they are also won by defending against unsound ones>. You are right. But I'd not say that black attack was unsound at least from the beginning. Certainly, everybody likes <childish> move 8...Qh4, even the theory doesn't recommend to move the queen too early, and too far. Nevertheless, black could play 10...Be4 to improve the pos. of his bishop. After 11.Rg1 Nxe5 and maybe 0-0-0.
Certainly when you build the attack, you should remember that <safety of his king> is the first goal. And the move 18.Bxd5 to protect "g2" square required the good imagination when you play OTB, and see it from black side is not too easy.
Jun-16-13  Dr. Funkenstein: I saw Bxd5 of course since it's the only forcing move for white and the only reasonable way to defend against Qxg3+, but I couldn't see the right follow after 18. ...Qxd5 because I didn't see after 19. Rad1 Qf3 20. Rd7+ Kf6 that now black has problems on the f-file with queen and king. Still don't see the finish however.
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