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Chanda Sandipan vs Sergei Tiviakov
Canadian Open (2007), Ottawa CAN, rd 9, Jul-14
Queen's Indian Defense: Classical Variation. Polugayevsky Gambit (E17)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Given 26 times; par: 23 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jul-17-07  Raskolnikov: <Is 14.Bf4 a novelty??> No, already in 1980 Kasparov used this line in legendary Kasparov vs Marjanovic, 1980. The feature "find similar game " gives 15.Re1 as a novelty, but this move appeared in 1980 game too. Vasili Lebedev gives 18.Rb1 as a novelty.
Jul-23-07
Premium Chessgames Member
  Chessmensch: An excellent game that is discussed in Kavalek's Washington Post chess column on July 23, 2007. http://www.washingtonpost.com/wp-dy...
Feb-13-15  SpiritedReposte: White is going 110 mph here. With no brakes lol.
Aug-28-16  Steve.Patzer: Again I anticipated the first move, but had no idea how to continue.
Aug-28-16  Virgil A: GM Lubomir Kavalek in his column, Qh4 is the computer best.
Aug-28-16  NBZ: My move was 22. Nxg7. If 22. ... Kxg7 23. Qh6+ Kg8 24. Bf6 is brutal. But 22. ... Nxg7! 23. Bxd7 Rxe1+ (somehow I missed this in my calculation) 24. Rxe1 Nxh5 25. Re8+ Kg7 and the ending is quite unclear. The two bishops are massive in the position but black has the extra pawns.
Aug-28-16
Premium Chessgames Member
  YouRang: Insane Sunday 22.?


click for larger view

With all the white firepower camped just outside of the black king's palace, I'm guessing that there's a piece sac to break down the barrier. The question is which piece?

I'm inclined to try a sac that gives check: <22.Nh6+>


click for larger view

A good try because of 22...gxh6? 23.Bf6 threatens mate after Bxe6 (remove guard of g7) and Qxh6 (threat Qg7#).

If black declines the knight, then he has to move the king. It can't be 22...Kh8? 23.Nxf7+ Kg8 24.Bf5 Qxf7 25.Bxh7+ Kf8 26.Bg6 (attacks Q and threatens Qh8# ). So it must be <22...Kf8>


click for larger view

It's not clear to me how to proceed. Perhaps <23.Re3> with Rf3 in view. If so, black still can't take the N (23...gxh6? 24.Qxh6+ Kg8 25.Bf6 ).

Anyway, it looks promising.

~~~~

Well, I didn't get the game line. Checking with the computer, the game move <22.Bf6!> is indeed stronger. I'm a little surprised that black swallowed the poison with <22...gxf6? 23.Qh6>.

However, the computer thought my 22.Nh6+ was a pretty good runner-up move, so I'm okay with it :-)

Aug-28-16
Premium Chessgames Member
  patzer2: Count me among those who guessed 22. Bf6!! as today's Sunday solution, but failed to find the winning follow-up.

According to the computers, Black's game took a turn for the worse with 16...Ne6? allowing 17. Ne4 (1.09 @ 33 depth, Stockfish 5 SSE).

Instead, 16... Qd8 17. Nd6 Bc6 18. Rc1 Nc5 = (0.18 @ 41 depth, Komdo 9.3) keeps it about level.

Aug-28-16
Premium Chessgames Member
  al wazir: I didn't make a serious attempt to solve this one; "insane" is above my pay grade. But my idea was 22. Nh6+, and I think that is also a winning move, though I didn't try to analyze it exhaustively. The plan after 22...gxh6 is to play 23. Bf6, and then use the ♗ or the ♖ to eliminate the ♘ on e6.

For example, 23...Qd6 (23...Nf4 24. Bxd7 Nxh5 25. Rxe8#) 24. Rxe6 Rxf6 (24...Bxe6 25. Qxh6 Qf8 26. Qg5+; 24...fxe6 25. Qg4+ Kf7/Kf8 26. Qg7#) 25. Bxe6 Bxe6 26. Qxh6 Qf8 27. Qg5+.

But 25...fxe6 26. Qxh6 Kf7 27. Qg7+ Ke8 28. Qg8+ Qf8 spoils the fun.

Aug-28-16  AlicesKnight: I was on <al wazir's> lines but made far less effort .......
Aug-28-16
Premium Chessgames Member
  RandomVisitor: Komodo likes 22.Nh6+, at least after short runs.
Aug-28-16  mel gibson: I didn't see this & even my chess engine didn't see the solution either. That's the first time that DR4 64 bit has failed. it said

22 Nf5-h6 score +1.43 depth 19

Aug-28-16
Premium Chessgames Member
  RandomVisitor: Komodo likes 22.Nh6+ Kf8 23.Bf6 g6 24.Qe5 with transpositions, so 22.Bf6 g6 23.Nh6+ Kf8 24.Qe5 also works
Aug-28-16
Premium Chessgames Member
  PhilFeeley: I liked Bf6. Didn't even consider Nh6+.

I don't often get these insane ones, so I'll count it as a win.

Aug-28-16  Ayaend: Wow the nice combo at the end ! remarquable
Aug-28-16  njdanie: The game was played at the Canadian Open in Ottawa. I watched it live at the site. It gained considerable attention in the kibitzing room because as early move 17. Ne4 it was becoming obvious that white, young upcoming Chanda, was "launching" and, older veteran GM, Tiviakov was gonna get "spanked"...
Aug-28-16
Premium Chessgames Member
  YouRang: <al wazir: I didn't make a serious attempt to solve this one; "insane" is above my pay grade.>

Yes, but I find that some insane puzzles aren't quite as insane as others. :-)

Today's puzzle at least presents a few move ideas out of the gate. Sometimes the insane puzzles give you no clues whatsoever, and even after you see the answer, you couldn't articulate why it's the best move.

Aug-28-16
Premium Chessgames Member
  Jimfromprovidence: I really liked 24 Rbd1.


click for larger view

It not only threatens 25 Rd4, seeing Rg4+, but prevents 24...Ne4 because of the pin on the d pawn.

I'm curious how 24 Rbd1, above, compares to 24 Rb4, below.


click for larger view

Aug-28-16
Premium Chessgames Member
  RandomVisitor: After 21...Re8


click for larger view

Komodo-10.1-64bit:

+4.60/34 <22.Bf6 g6 23.Nh6+ Kf8 24.Qe5 Qc7 25.Qb2> Qd6 26.Be5 Qd8 27.Re3 d4 28.Bxe6 Rxe6 29.Rd1 Bb7 30.Rxd4 Bd5 31.Qd2 Nc7 32.Bxc7 Qxc7 33.Rxd5 Rxe3 34.Qxe3 Rd8 35.Qa3+ Kg7 36.Qb2+ Kf8 37.Qb4+ Ke8 38.Ng4 f6 39.Nxf6+ Kf7 40.Qa4 b5 41.Qe4 Rxd5 42.Nxd5 Qd6 43.Nf4 a6 44.Qb7+ Kg8 45.h4 h6 46.Qc8+ Kg7 47.Qe8 Qf6 48.Ne6+ Kh7 49.Qd7+ Kg8 50.Kg2 a5 51.Qc8+ Kh7 52.Qb7+ Kh8 53.Qd7

+3.98/34 <22.Nh6+ Kf8 23.Bf6 g6 24.Qe5 Qc7 25.Qb2> Qd6 26.Be5 Qd8 27.Re3 d4 28.Bxe6 Rxe6 29.Rd1 Bb7 30.Rxd4 Bd5 31.Qd2 Nc7 32.Bxc7 Qxc7 33.Rxd5 Rxe3 34.fxe3 Rc8 35.Qb4+ Ke8 36.Kg2 f6 37.Qd4 Rd8 38.Ng8 Rxd5 39.Nxf6+ Kf7 40.Nxd5 Qc2+ 41.Kf3 Qf5+ 42.Qf4 Ke6 43.e4 Qxf4+ 44.gxf4 h6 45.Ke3 Kd7 46.Kd4 Kd6 47.h3 Ke6 48.h4 Kd6 49.a4

+2.01/34 22.Rbd1 f6 23.Rxd5 Qf7 24.Qxf7+ Kxf7 25.Bc1 Nec7 26.Nd6+ Kg6 27.Rxe8 Bxh3 28.Rxa8 Nxa8 29.f4 h5 30.f5+ Kh7 31.Rd4 N8c7 32.Rh4 Bg4 33.h3 Bf3 34.Kf2 Bd5 35.a3 Kg8 36.Be3 Nb8 37.Rxh5 Nc6 38.Rh4 Kf8 39.Bf4 Kg8 40.g4 Na6 41.Be3 Nc7 42.g5 fxg5 43.Rg4 Kf8 44.Bxg5 Ne8 45.Nxe8

Aug-28-16
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop, a knight and two pawns.

White can attack the black king with five pieces (the rook on e1 via e5) while only the knight on e6 seems to be an effective defender. The bishop on h3 x-rays the black queen. The black pieces lack coordination, particularly the unconnected rooks.

There are a number of moves to try to exploit these details: Nd4, Nxg7, Nh6+, Bf6, Qh4.

-----

22.Nd4 doesn't seem to achieve much after 22... Nac5.

-----

22.Nxg7 is met with 22... Nxg7 (22... Kxg7 23.Qh6+ Kg8 24.Bf6 followed by Bf5 or Re5 with a winning attack) 23.Bxd7 Rxe1+ (23... Nxh5 24.Rxe8+ Kg7 25.Rxc8 wins a rook) 24.Rxe1 Nxh5 25.Re8+ Kg7 26.Bxc8 Nc7 unclear, White is still a pawn down.

-----

22.Bf6 gxf6 and White probably doesn't have enough compensation.

-----

22.Qh4 f6 seems to make Black's defense easier.

-----

22.Nh6+:

A) 22... gxh6 23.Bf6 followed by Qxh6 and Bf5 or Re5 looks winning.

B) 22... Kh8 23.Nxf7+ Kg8 24.Nd6 seems to win decisive material.

C) 22... Kf8 23.Re5 looks very good for White (23... gxh6 24.Qxh6+ Kg8 25.Bf6 is similar to A).

-----

I think I'd play 22.Nh6+. That's all I can do today.

Aug-28-16  steinitzfan: At the end, it looks like Black cannot both defend against the long rook lift and avoid the opening of the queen file. I looked at the long rook lift but I didn't realize that opening the queen file put Black in a mating net. I thought White was stymied after 25...Ne4.
Aug-28-16  Stalwart: I was liking knxg7 but what do I know?

You get a pawn to start and after the queen exchange you can skewer the f8 rook with your black bishop on e7 after hiding your white bishop on c6 if I'm not mistaken.

bterranlong.wix.com/whitemates

Aug-28-16  drollere: i couldn't find this one. on the principle that black's N on e6 was the most annoying piece on the board, i looked for sacrifices such as Rxe6.
Aug-29-16
Premium Chessgames Member
  patzer2: <Jimfromprovidence: I really liked 24 Rbd1.> So did I. Indeed 24. Rbd1! is the key to making the combination work after 22. Bf6!! gxf6 23. Qh6 Nac7 (or practically any other Black move).

The beauty of 22. Bf6!! is that if Black takes the piece, then White can take his sweet time putting his Queen on h6 and moving the rook on a1 from b1 to d4 with decisive effect. Despite the fact that the White attack build-up is relatively slow, there's really nothing Black can do to stop it.

After the Rook finally arrives at d4, White will soon mate. Deep Fritz 15 indicates it's mate-in-five after 25. Rd4 .

Sep-07-16  Moszkowski012273: Nice!
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