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Ni Hua vs Sergei Tiviakov
"The Big Squeeze" (game of the day Jan-03-2008)
Torneo di Capodanno (2008), Reggio Emilia, Jan-02
Scandinavian Defense: Gubinsky-Melts Defense (B01)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Given 9 times; par: 72 [what's this?]

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sac: 36.Rxg7+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Mar-01-18
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

Black is about to play f6, reinforcing g7.

Only the black king protects the square g7. Therefore, 36.Rxg7+ Kxg7 (36... Kh8 37.Qf6, followed by Qxh6, wins) 37.Rg4+ Ng6 (37... Kh8 38.Qf6+ Kh7 39.Qg7#) 38.Bxg6:

A) 38... fxg6 39.Qxg6+ Kf(h)8 40.Qg8#.

B) 38... Kf8 39.Bh7

B.1) 39... Rd7 40.Qf6 followed by Rg8#.

B.2) 39... Re8 40.Qf6 as above.

B.3) 39... f6 40.Rg8+ Kf7 41.Qg6#.

C) 38... Kh8 39.Qf6+ Kg8 40.Bxf7+ Kf8(h7) 41.Qg7#.

D) 38... Qd7 39.Bxf7+ Kf(h)8 40.Rg8#.

E) 38... f6 39.Bh7+ Kf8 (39... Kf7 40.Qg6+ Kf8 41.Qg8#; 39... Kh8 40.Rg8#) 40.Rg8+ Kf7 41.Qg6#.

F) 38... Rd7 39.Bh7+ Kf8 (39... Kh8 40.Rg8#) 40.Qf6 as in B.1.

G) 38... Re8 39.Bxf7+ Kf8 (39... Kh8 40.Qf6+ Kh7 41.Qg7#) 40.Rg8+ Ke7 41.Rxe8#.

Mar-01-18
Premium Chessgames Member
  agb2002: I stopped calculation too soon in my line B.1, since after 40... Ke8 41.Rg8+ Black has 41... Bf8. However, 42.Bb4 looks crushing (42... Rxf6 43.Rxf8#).

<An Englishman> Monty Python and the Holy Grail. I had a good laugh.

Mar-01-18
Premium Chessgames Member
  wtpy: I went with 39 Qf6 and while that may not be quite as good as text after 39 ..Ke8 40 Bf5 black is done.
Mar-01-18  AlicesKnight: Saw a lot but missed the pretty point 41.Bg6.
Mar-01-18  5hrsolver: Good analysis <agb2002>

I too went with 40. Qf6

<engineerX> gives a good continuation to 40.Qf6 back in 2008

<engineerX: <UdayanOwen: Sure 40.Qf6 wins but unless I've missed something, it is nowhere near as good as the game continuation.> You are missing 40.Qf6 Ke8 41.Rg8+ Bf8 42.Bb4 with a forced mate, e.g. 42...Rd6 43.Qxe5+ Re7 44.Rxf8+ Kd7 45.Bf5+ or 42...Qd6 43.Qxe5+ Kd8 44.Rxf8+>

<larsen959> Gives the finish to the game line back in 2009

<larsen959: nobody wrote: 41..Bxa3(forced) 42.d6+!! Kxd6(forced) 43.Bxe5+ and white wins the Queen!>

Makes me wonder if black saw this line before he resigned.

Mar-01-18  saturn2: After the distruction Rxg7 black is in trouble.

<36... Kh8 37.Qf6, followed by Qxh6, wins> I would prefer 37 Rg4 because after 37..Bc5 the rook on a6 attacks the queen and defends h6.

Mar-01-18
Premium Chessgames Member
  gofer: I imagine we all got the first couple of moves, but then I went wrong (or at least not the accurate line played)...

<36 Rxg7 ...>

The sacrifice cannot be ignored.

36 ... Kh8?
37 Qf6! Bc5
38 Reg4! Bxf2+
39 Kh1 Ng6 (Rxf6 40 Rg8+ Kh7 41 R4g7#)
40 R7xg6+ Rxf6
41 Rg8+ Kh7
42 R4g7#

<36 ... Kxg7>
<37 Rg4+ Ng6>
<38 Bxg6 Kf8>
<39 Bh7 Rd7!>
<40 Qf6! ...>

Okay, not anywhere as good as <40 Rg8+ Ke7 41 Bg6 mating>, but still pretty strong!

<40 ... Ke8>
<41 Rg8+ Bf8>
<42 Bb4! ...>

Now the mating threats still all exist because Rd7 is blockin any escape for the poor king!


click for larger view

42 ... Re7
43 Rxf8+! Kd7 (Kxf8 Qh8#)
43 Qxe7#

42 ... Rdd6 mate in 10 starting with Qxe5+

42 ... Qd6 mate in 8 starting with Qxe5+

42 ... Rad6 mate in 7 starting with Qxe5+

~~~

I see I am covering old ground, but not alone in mssing the best continuation...

Mar-01-18
Premium Chessgames Member
  cocker: Ni Hua to a grasshopper?
Mar-01-18  Whitehat1963: Too much going on for me to see clearly to the end of this one.
Mar-01-18
Premium Chessgames Member
  malt: 36.R:g7+ K:g7
(36...Kh8 37.R4g4 Ng6 37.R7:g6 fg6 38.Qf8+ Kh7 39.B:g6# ) 37.Rg4+ Ng6 38.B:g6 Kf8
(38...fg6 39.Q:g6+ Kf8 40.Qg8# )
39.Qf6 Ke8 40.Qh8+ Kd7 41.Bf5+ Re6 42.de6+ fe6 43.Be4 blocking c6 threatening Rg7+
Mar-01-18  leRevenant: Surprisingly, I got this one.
Mar-01-18  mel gibson: I thought it was 36 Q-f6 threatening mate.

It wasn't.

Stockfish 8 says mate in 22:

36. Rxg7+

(36. Rxg7+ (♖g3xg7+ ♔g8xg7
♖e4-g4+ ♘f8-g6 ♗h5xg6 ♕c7-c4 ♖g4xc4 f7xg6 ♕f5-c8 ♔g7-h7 ♕c8-d8 g6-g5 ♖c4-c8 ♖e7-g7 ♕d8-h8+ ♔h7-g6 ♕h8-e8+ ♖g7-f7 ♕e8-g8+ ♖f7-g7 ♕g8-e6+ ♔g6-h7 ♕e6-f5+ ♖g7-g6 ♗c3xe5 ♗d6xe5 ♕f5xe5 ♖g6-g7 ♕e5-f5+ ♖a6-g6 d5-d6 g5-g4 d6-d7 ♖g7-e7 d7-d8♕ ♖e7-e1+ ♔g1-h2 g4-g3+ f2xg3 ♖e1-h1+ ♔h2xh1 ♔h7-g7 ♕d8-d7+) +M22/34 83)

Mar-01-18  1.e4effort: Beautiful onslaught! Despite black making very logical responses after Rxg7+ and the ensuing moves, he's left with no options - if he takes the bish it's mate, if he doesn't take the bish, its mate.
Mar-01-18
Premium Chessgames Member
  patzer2: Forgot I saw this 10 years ago, and went for 36. Be2 (second best move according to the computer) for my attempt at today's Thursday puzzle solution.

According to Stockfish 8, Black's best after 36. Be2 is 36...Rb6 when the simple 37. Rxa4 +- (+2.40 @ 34 ply) or the more difficult 37. Reg4 Ng6 38. Rc4 Qd7 39. Rc8 +- (+2.90 @ 35 ply) is winning.

Of course much stronger is the game continuation with White's crushing demolition combination 36. Rxg7+! Kxg7 37. Rg4+ Ng6 38. Bxg6 +- (+18.92 @ 30 ply, Stockfish 8).

P.S.: Black's 35...Ra6?, allowing 36. Rxg7! +- (+18.92 @ 30 ply, Stockfish 8), makes it too easy for White. Instead, 35...Nh7 36. Reg4 f6 37. Bg6 Nf8 38. Rh4 e4 ± (+1.22 @ 31 ply, Stockfish 8) puts up enough resistance to leave the outcome in doubt.

Mar-01-18  saturn2: <patzer2 Black's best after 36. Be2 is 36...Rb6 when the simple 37. Rxa4 +- >

I would be tempted to pin by 37 Ba5

Mar-01-18
Premium Chessgames Member
  ChessHigherCat: I saw Rxg7 Kxg7 Rg5+ Ng3 and didn't even think of Bxg3, which is pretty pathetic but I was tired and doing it in my head. In any case, it has me googling for affordable brain transplants so I should be making remarkable progress soon!
Mar-01-18  Cheapo by the Dozen: I just calculated to the point that White had a pawn for the exchange and would obviously win at least another pawn while still attacking, and declared success.

The key for me was realizing that Black could defend if he could unblock his second rank, and so an extremely forcing line was called for.

Mar-01-18  schachfuchs: <...Black's best after 36. Be2 is 36...Rb6 when the simple 37. Rxa4 +- (+2.40 @ 34 ply) or the more difficult 37. Reg4 Ng6 38. Rc4 Qd7 39. Rc8 +- (+2.90 @ 35 ply) is winning.>

Isn't 37.Rxg7+ after 36.Be2 Rb6 not good anymore?

Mar-01-18  Junbalansag: Christowen, i am curious what language arare u using. Its too bad that it is a long comment and ur saying Latin, completely outlandish.
Mar-01-18  drollere: i had
36. Rxg7+ Kh8
37. Reg4 Ng6
38. Bxg6 Kxg7
39. Bxf7+ Kf8
40. Rg8#
but i wasn't playing black.
Mar-01-18
Premium Chessgames Member
  Richard Taylor: Velly clever!
Mar-01-18  King.Arthur.Brazil: I saw 36.Qf6 but as its said that "medium", I chose the move 36.Rxg7+ and follow the same sequence of the game, but instead of 40.Tg8+ I would play Qf6 and mate next.
Mar-01-18
Premium Chessgames Member
  patzer2: <schachfuchs> Stockfish 8 evaluates 36. Be2 Rb6 37. Rxg7+? Kxg7 ∓ to -+ (-2.08 @ 36 ply) as throwing away the win and giving it to Black.

The problem is with the Bishop no longer on h5 (after moving to e2), the Rook sack simply doesn't work.

Mar-02-18  schachfuchs: Oh, crazy me! I mixed up Be2 and Bd2! :-(
Mar-02-18
Premium Chessgames Member
  agb2002: <5hrsolver: Good analysis <agb2002>> Thank you!
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