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Sergei Tiviakov vs Thomas Roussel-Roozmon
Montreal International Chess Tournament (2009), rd 4
Bishop's Opening: Berlin Defense (C24)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Jan-22-10
Premium Chessgames Member
  playground player: <Once> I see I'm going to have to live a lot longer than I expected! Maybe by the time I'm 95 I'll be able to play chess like this.
Jan-22-10  TheaN: Thursday 21 January 2010

Getting back to Friday here :).

Target: 3:30;000
Taken: 2:30;982

Material: Black up, ♗+♘+♙ / 2♗

Candidates: Bb2, Rxd7, <[Bxf7†]>

-ML-
I was looking at ways to trap the Queen but it stops quickly after it's obvious Bb2 cannot be played. So, the attention goes to the Black King and the weak Knights. Knights defending each other CAN be a nice asset but usually, especially in open positions, it's a liability because they cannot move if both attacked. White abuses it differently here, but it shows they aren't well placed. I saw the key soon enough, which is:

<24.Bxf7† Kxf7 25.Rxd7†> it's difficult to spot what a follow-up can be. I noticed one nice follow-up which is impossible. I'm, for once, not gonna work from worst to best, just what I spot first (it might be better for all else too actually).

/A\
<25....Re7> loses by force, although not so obvious:

<26.Rxe7† Kxe7 27.Qxf6†!! > on any capture White has the same fork with Nd5†, winning the Queen back with a Knight profit. Clear enough. Okay, next.... Kg8 seems bad due to the same threat:

/B\
<25....Kg8 26.Rxg7†! Kxg7 27.Nf5† > and it is. As much, Kf8 loses in the same way.

/C\
<25....Kf8 26.Rxg7 > as the pressure is too big now. That leaves the suicidal looking Ke6.

/D\
<25....Ke6> although it puts Bg7 en prise, so are both of the White Rooks. However, it's the stronger piece that's still the problem for Black.

<26.Rd6†!! Kxd6 27.Nf5† gxf5 28.Qxc3 > seems to win. To be honest, this ain't actually very clear, but White has all the chances; the Bishop is going to develop with tempo, the Rook enters and the Queen becomes too powerful due to useless Black pieces. Time to check.

Jan-22-10  TheaN: 3/4

Grrrr. Why did I miss such an obvious mating move like 26.Qh3† in line D, as well as 27.Nf5† immediately in line A (although +N might be preferable over Q/N in an endgame; both win though, and the Queen endgame usually faster). Not my week.

Jan-24-10  eaglewing: <TheaN: ... 25....Kf8 26.Rxg7 as the pressure is too big now.> No, here you need 26. Ba3+, because 26.Rxg7 Qe1+ 27. Nf1 Kxg7 means, Black is happy.
Jun-01-15
Premium Chessgames Member
  Mating Net: A mighty fine tactical display by Tiviakov. Four consecutive forcing moves with the aim of forcing the enemy King to a forking square to harvest the Queen.
Aug-12-19  SamAtoms1980: Rxg7+ Kxg7 Nf5+

It's the opponent's Queen that we're sacrificing on Monday this week.

Aug-12-19  stacase: I got 26.Rxg7+ and 27.Nf5+ because it's a puzzle, but I don't see the forced mate. Maybe I should stare at it for a few more minutes.
Aug-12-19  stacase: <SamAtoms1980: Rxg7+ Kxg7 Nf5+ It's the opponent's Queen that we're sacrificing on Monday this week.>

Ha! Dunno if another few minutes would have done it.

Aug-12-19  lost in space: I love Mondays!

26. Rxg7+ Kxg7 27. Nf5+ and the queen is lost, enough for a 1:0

There is a combo I saw first, but this one is of course less effective than the one given above:

26. Rxg7+ Kxg7 27. Qxf6+ Kxf6 28. Nd5+ and 29. Nxc3. Still to prove that this is won.

Aug-12-19  Skewbrow: A lot of unprotected pieces. Most notably the black queen and the white rook on a1.

I'm sure the combo 26.Rxg7+ Kxg7 27. Nf5+, exploiting the vulnerable stance of the black queen caught our eyes. Due to the presence of that hanging white rook I think we need to verify that not taking the rook does not help black. If 27..Kh8 then 28.Qxf6 with mate threats looming, but not with a check. However, 28..Qxa1 does not thwart those mating threats, and white's backrank is still covered and 28..Qe1+ 29.Nf1 fails to help black.

Aug-12-19
Premium Chessgames Member
  agb2002: Black threatens Qxa1 and Nxd7.

The black queen is defenseless. Therefore, 26.Rxg7+:

A) 26... Kxg7 27.Nf5+ gxf5 28.Qxc3 wins decisive material.

B) 26... Kf8 27.Qxf6#.

C) 26... Kh8 27.Qxf6

C.1) 27... Qxa1 28.Rf7+ Kg8 29.Qg7#.

C.2) 27... Rf8 28.Rf7+ as above.

C.3) 27... Re6 28.Qf7 and mate soon.

C.4) 27... Qe1+ 28.Nf1 wins.

Aug-12-19  Cheapo by the Dozen: This puzzle isn't quite as trivial as it first looks; I'd call it more Tuesdayish in difficulty.

After 26 Rxg7+, one of Black's three legal moves allows mate on the move, while another, the game line, loses the queen to a discovered attack.

But that leaves

26 Rxg7+ Kh8
27 Qxf6,

threatening 28 Rf7+ with deadly effect.

Black's most reasonable-looking try to defang that threat is 27 ... Re6, but 28 Qf7+ threatens Rh7++, and that new threat is wholly unstoppable.

Aug-12-19  saturn2: Black threatens QxRa1 But white has
26. Rxg7+

26...Kxg7 27. Nf5+

26...Kf(h)8 27. Qxf6

Aug-12-19
Premium Chessgames Member
  malt: Have 26.R:g7+ Kh8
(26...K:g7 27.Nf5+ gf5 28.Q:c3 )

27.Q:f6 wins

Aug-12-19  Chesgambit: I find quickly Rxg7 and Nf5+
Aug-12-19  TheaN: A recycled Thursday where today's Monday combination was part of, and the actual played line. Back in the day I had the right idea but missed subtleties.

After <26.Rxg7+> it's obvious 26....Kf8 27.Qxf6# is not a good idea, and 26....Kh8 27.Qxf6 Re6 (else Rf7 and Qg7#) 28.Qf7 and mate can't be prevented after a few spite checks.

However, <26....Kxg7 27.Nf5+ +-> is curtains too.

Aug-12-19  jinkinson: This seems a little too complicated for a Monday. Personally I think if the combo takes more than 2 moves from start to finish it is too hard for a Monday.

Like some others I saw Rxg7+ but then saw Qxf6+ on the next move instead of Nf5+.

Aug-12-19
Premium Chessgames Member
  halito27: Tiviakov must have seen the sequence when he played 22. b3. Even if white doesn't take the poisoned pawn on c3, it still leads to a nice bishop outpost after 22... cxb3 23. Bxb3 Nc5 24. Nd5 Nxd5 25. Bxd5.

One can certainly understand black falling for temptation, but the position's lost quickly after 23...Qxc3.

Aug-12-19  TheaN: <halito27: Tiviakov must have seen the sequence when he played 22. b3.>

I'd reckon he at least spotted the combination after 21.Rd1 ⩲, which is still only a minor advantage to White, after 21....a6?! 22.b3 ± is already worse, 23....Qxc3 +- is curtains. What can happen in three moves...

Aug-12-19
Premium Chessgames Member
  gawain: If Black tries to refuse the rook after Rxg7+, he loses even more quickly.
Aug-12-19
Premium Chessgames Member
  patzer2: A very good move you're not likely to see in a tactics puzzle is 22. b3!. White sets up a poisoned pawn trap with 22. b3! which Black falls into with 22...cxb3 23. Bxb3 Qxb3??, giving White an easy win with 24. Bxf7+ +- (+4.40 @ 31 ply, Stockfish 10).

However, 22. b3! is more than just trap bait. If Black avoids capturing the poisoned pawn (i.e. 23...Qxb3??), White still secures a clear advantage.

Instead of 23...Qxb3?? (Black's clear losing move), Stockfish 10 gives 23...Nc5 24. Nd5 ± (+0.75 @ 41 ply) as Black's best alterative:

( [Stockfish 10 64] 41:+0.75 23...Nc5 24.Nd5 Qc6 25.Nxf6+ Qxf6 26.Qxf6 Bxf6 27.Bd5 Rab8 28.Bxh6 g5 29.h4 gxh4 30.Kf1 Rec8 31.Rdb1 Be7 32.Be3 a5 33.Ke2 Kg7 34.Rh1 b5 35.axb5 Rxb5 36.Kf3 Nb3 37.Bxb3 Rxb3 38.Rxa5 Rcxc3 39.Rxe5 Bf6 40.Rd5 Rc4 41.Rhd1 Kg6 42.Rf5 Bd4 43.Rf4 Kg7 44.Rxh4 Rbc3 45.Rh5 Bxe3 46.fxe3 )

Aug-12-19  Momentum Man: This made me think of the old song “zoom zoom zoom let’s go back to my room “
Aug-12-19  1stboard: Nasty way White ends black's threat of mate .....
Aug-12-19  SpamIAm: <patzer2>- Don't you mean 23...Qxc3? Just checking.
Aug-12-19
Premium Chessgames Member
  Breunor: I saw right away that 26 Rxg7ch wins after Kxg7 27 Nf5ch.

But I wasn't sure on how to answer 26 Kg8. I was worried about the black queen on the loses, but I finally reasoned that white mates first with 27 RQxf6.

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