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Martyn Kravtsiv vs Valery Kazakouski
Rilton Cup (2016/17), Stockholm SWE, rd 4, Dec-30
Italian Game: Two Knights Defense. Modern Bishop's Opening (C55)  ·  1-0

ANALYSIS [x]

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May-06-18  Mayankk: Does 31 Qxd7 also win? That’s where I diverged from the game.... With the 7th rank not open, something which Qxf6 accomplished so nicely, It probably will lose. If so, then this game is indeed tricky.

Rest is not difficult to spot and is something which I may actually play in a real game.

May-06-18  ChessHigherCat: <Mayankk: Does 31 Qxd7 also win?>

I don't see it. 31. Qxd7 Nxd7 32. cxd7 Qd6 and now what?

May-06-18  Mayankk: @CHC - Yes, I know it loses.

The question was more out of my disappointment that I failed to solve the puzzle despite guessing most of the follow-up moves correctly.

Even if one doesn’t spot the Qxf6 tactics, Rxb3 is still playable since it ruins Black’s pawn structure. But maybe there is no other way to take advantage of it other than the Qxf6 tactics.

May-06-18  ChessHigherCat: @ <Mayankk> (Mayan King Kong?): I would "beware of substitutes", Qxf6 is really a miraculous combination, the way it paves the way for Ra7 and if Qxd2 d8->Q+! I wasn't surprised when I saw Kravtsiv is nearly 2700, that's real artistry.
May-06-18  mike1: Not sure about this one.
Surely nothing insane about 26 Rxb3 cxd3, 27 Nc6 Qe8... Just better for White
May-06-18
Premium Chessgames Member
  agb2002: White has a bishop for a knight.

Black threatens Nxa1 but White has Nc6.

White can create a queenside pawn majority with 26.Rxb3 cxb3 27.Qxb5 followed by the capture of the pawn on b3. For example, 27... Ra8 28.Ra6 Rxa6 (28... Rea7 29.Nc6 seems to end up winning decisive material) 29.Qxa6 Rf7 (with the idea Ne4-Qh4) 30.Qc4 Qf8 31.Be3 followed by Qxb3-Qc2 and a pawn roll on the queenside.

Another option is 26.Nc6 Rxc6 (26... Qe8 27.Nxe7 wins an exchange) 27.Rxb3 (27.dxc6 Nxa1 28.Rxa1 Qc8 29.Qf3 d5 loses the pawn on c6 and White doesn't have the trick Qf5+ followed by Bxh6 to exploit the overloaded g-pawn) 27... cxb3 28.dxc6 Qb6 (28... Qc8 29.Qxb5) 29.Qf3 Kg6 followed by d5, unclear.

I don't know. I'd probably play 26.Rxb3.

May-06-18  morfishine: Quite an interesting struggle
May-06-18  Pchief: 27...Rxc6 is in no way necessary. Alternative is 27...Qc7 28.Nxe7 Qxe7 29.Qxb5 Qf7 30.Qxb3 Nxd5, in which black is one pawn down but still far from losing.
May-06-18  mel gibson: I wasn't sure with this one.
I saw the nice Knight fork but didn't realise
that the black Knight had to go first.

Stockfish 9 says

26. Rxb3

(26.
Rxb3 (♖a3xb3 c4xb3 ♘b4-c6 ♕d8-c7 ♘c6xe7 ♕c7xe7 ♕e2xb5 ♕e7-e8 ♕b5xb3 ♖c8-b8 ♕b3-c2+ ♕e8-g6 ♕c2xg6+ ♔h7xg6 b2-b4 ♘f6xd5 ♖a1-a5 ♘d5-f6 ♖a5-a6 d6-d5 f2-f3 h6-h5 ♔g1-f2 h5-h4 ♔f2-e2 ♔g6-f5 ♖a6-a5 ♖b8-d8 ♔e2-d3 g7-g5 b4-b5 ♖d8-b8 ♗d2-e3 ♘f6-h5 c3-c4 ♘h5-f4+ ♗e3xf4 d5xc4+ ♔d3xc4 ♔f5xf4 ♔c4-c5 ♖b8-c8+ ♔c5-d5 ♖c8-d8+ ♔d5-c6) +1.87/37 274)

score for White +1.87 depth 37

May-06-18  morfishine: Forgot to add that the first move seemed fairly obvious and a bit mundane <26.Rxb3> leading up to the more insane move <31.Qxf6>
May-06-18  Pasker: Qxf6 is insane not Rxb3.
May-06-18  landshark: <Chess Higher Cat> Ditto. 31.Qxf6 and 33. Be3 is dastardly!
May-06-18  clement41: I found 33 Ra7 attractive.
I haven’t computer-checked anything but herés one line I came up with: 33...Kg6 (...Qd2?? and the promotion/discovery d8=Q+ wins the Queen ; ...Kg8?? Ra8+ then d8Q +-) 34 Be3 h5
35 Bc5 Qc5 (...Qb8 Be7 Qa7 d8Q Qa1 Kh2 Qb2 and I think black will get mated before being able to push the b pawn) 36 d8Q Qa7
37 Qg8 Kf5
38 Qb3 removing the most dangerous pawn
May-06-18  clement41: In my line above 35 Bf4? would only draw by perpetual after ...Qf4 d8Q Qc1 Kh2 Qf4 g3 Qf2 Kh1 Qf1
May-06-18
Premium Chessgames Member
  Jimfromprovidence: If black plays 30...Rc7, below, then 31 Qxf6 is out of the question.


click for larger view

Maybe the insane part begins here.

May-06-18
Premium Chessgames Member
  Dionysius1: The good stuff doesn't really come until 30. ♕xf6 and 33. ♗e3 either of which could have been a good puzzle but it's a cracking sequence from where Cg.com place it, so an enjoyable puzzle all told.
May-06-18  Walter Glattke: Jim, see my comment above, 31.Ra6 Qxa6
32.Qxc7 while 31.-Rxc6 32.Rxb6 Rxd6
33.Rxd6 loses immediately.
May-06-18  ChessHigherCat: <JimfromProvidence: If black plays 30...Rc7, below, then 31 Qxf6 is out of the question.>

That's true, but I get the impression white still wins with 31. Ra6 Qxa6 32. Qxc7, although it's probably a tight race to the finish line if black plays Qa1+ and takes the b-pawn.

May-06-18  Walter Glattke: I saw this and think for 32.-Qa1+ 33.Kh2
Qxb2 34.Bxh6 threatens mate 34.-Kxh6 35.Qf4+ Kh7 36.c7 with won pawn race.
May-06-18  Walter Glattke: 36.Qf5+ / 37.c7
May-06-18  BxChess: <ChessHigherCat:...there are simply too many possibilities for a reasonable puzzle> There is a flaw in your logic. On Sundays there are no reasonable puzzles.
May-06-18  ChessHigherCat: <BxChess> <ChessHigherCat:...there are simply too many possibilities for a reasonable puzzle>

<There is a flaw in your logic. On Sundays there are no reasonable puzzles.>

Sometimes they're crazy but if even I can guess the first three moves, it's not more difficult than discovering the theory of relativity.

May-06-18  cormier: 1) +2.72 (30 ply) 30...Rc7 31.Ra6 Qxa6 32.Qxc7 b4 33.Kh2 e3 34.Bxe3 bxc3 35.Bd4 Ne8 36.Qb7 Qc4 37.bxc3 b2 38.f4 Nf6 39.Be5 Qe4 40.Qxb2 Qxc6 41.Qb4 Qd5 42.c4 Qe4 43.Qc5 Nd7 44.Qd4 Qxd4 45.Bxd4 Kg6 46.Kg3 Nb8 47.Kf3 Nc6 48.Bc3 Kf7 49.Ke4 g6 50.g4 Ne7 51.Bd4

2) +4.18 (30 ply) 30...Qc7 31.Bf4 Qxd6 32.Bxd6 Re8 33.c7 Kg6 34.Ra5 Kf5 35.Rxb5+ Ke6 36.Rb8 Kd7 37.Be5 Rc8 38.Rxb3 Ne8 39.Rb6 Ra8 40.Rb4 Nxc7 41.Bxg7 Ra1+ 42.Kh2 e3 43.fxe3 h5 44.Be5 Nd5 45.Rd4 Ke6 46.Bg3 Ne7 47.Rh4 Ra2 48.Rb4 Kf7 49.Rb7 Ke6

1.0 minute analysis by Stockfish 9

May-06-18  messachess: What's really great is the resource move 33.Be3. Maintains the pressure.
May-06-18  ChessHigherCat: 33. Be3 is also interesting in this (inferior) variant:

31. Qxd7 Nxd7 32. cxd7 Qd6 33. Be3 Qxd7 34. Bd4! and now, oddly enough, black has no way of preventing Ra7 followed by Rxg7+ (FWIW)

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