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Zsofia Polgar vs Sonny Kamberi
North Bay Open (1996), North Bay CAN, Aug-??
Spanish Game: Closed Variations. Smyslov-Breyer-Zaitsev Hybrid (C93)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-17-17  Cheapo by the Dozen: At the end of <Phony Benoni's> line above, Black has a queen for two pieces. Anything that avoids immediate mate (e.g. ... Rg8) loses queen for rook because of Rh7+. So White will have a material advantage plus a still-sizzling attack that will at a minimum gain more material.
Oct-17-17
Premium Chessgames Member
  drollere: it seems to me that white has many ways to win after 24. .. Qe7; 25. Re1.
Oct-17-17  stst: Q-sac again:
34.QxN+ KxQ
35.Rh1+ Bh6
36.RxB+ Kg7
37.Reh1 any
38.Rh7+ Q---gone
Oct-17-17
Premium Chessgames Member
  drollere: <38. Rh7+ Kf8 39. Rxe7 Kxe7 40. Bxg8 with decisive material plus for white>

38.Rh7+ Kf8 39.Rxe7 Nxe7 40.Bxg8 Nxg8 and white is only up a piece with opposite color bishops. might be worth a tussle.

Oct-17-17  saturn2: Let us count: 34 QxN white gives queen for N. 36 RxB white gets a bishop for free. 39 RxQ white gets queen for rook. So white is up a piece.
Oct-17-17  lost in space: <<drollere:> <38. Rh7+ Kf8 39. Rxe7 Kxe7 40. Bxg8 with decisive material plus for white> 38.Rh7+ Kf8 39.Rxe7 Nxe7 40.Bxg8 Nxg8 and white is only up a piece with opposite color bishops. might be worth a tussle.>

Correct. But there is in addition a small trick after 38...Kf8


click for larger view

39. Bxg8! Qxh7 (what else? for example 39...Kxg8 40. Rh8+ Kf7 41. R1h7#)

40. Rxh7! Rd7
(even worse is 40...Kxg8 41. Nf6+ Kf8 42. Bxg5 and it seems mate is near)

41. Rxd7 Nxf6 42. Bc8 Ngh5 and white is much better.


click for larger view

Oct-17-17  Walter Glattke: 37.-Rh8? 38.Rxh8 Bg6 39.fxg6 Rxh8 40.Nf5+ Kxg6 41.Nxe7+ Nxe7 42.Rxh8 2 Bishops and a rook for a pawn
37.-Rg8 38.Nh5+ Bxh5 39.R1xh5 Kf8 40.Bxg8
or 39.-Kf8 40.Rxf6+ Bf7 41.Nh5 Rg7
42.Nxg7 Kxg7 43.Rxf7+ Qxf7 44.Nxf7 2 bishops more or 41.-Qxf6 or 41.-d5 always decisive material for White.
Oct-17-17
Premium Chessgames Member
  Once: Here's the position after 29. Bb3 Kh8


click for larger view

White has an advantage in space and piece mobility. Her plan is pretty obvious. She wants to take advantage of the open h file by parking her queen and bishop on it.

Black's plan is equally obvious. He wants to stop white's plan. He plans to do this by playing Be8 to stop the white queen from infiltrating at h5. Or if the queen has already infiltrated, to evict her.

Both plans will take some time to execute. White has to move her queen, knight and king. Black has to move knight, rook and bishop. The question is ... who will get there first?

So we get 30. Qd1 Nh7 31. Qh5 Rf8 32. Ng4, bringing us to here:


click for larger view

Now the move that black ought to play is 32...Qe8, offering to exchange off the big girls. Black would still be struggling positionally, but the white attack would be blunted.

But for some reason black doesn't play this. Instead he chooses what was probably his original plan. I imagine he had in mind the draughts/ chequers sequence of Bd7-Be8-Bf7 to blunt the white Bb3.

After 32...Bd7 33. Kf2, we get to our puzzle position.


click for larger view

The black bishop has finally made it to e8, but it's one move too late. White crashes through with Qxh7 and the rooks quickly follow along the h file with check.

The final sequence is pretty. What is arguably more important is how Zsofia gets an advantage in space and piece mobility in the first place. Even if Qxh7+ hadn't been available to her, she would still have won with the simple plan of Qh3, Rh2, Reh1.

Instructive game.

Oct-17-17  patzer2: <Once> I haven't looked at it too closely, but after 32...Qe8 Stockfish 8 indicates White simply declines the Queen exchange with 33. Qh3 +- (+6.41 @ 29 depth) while still maintaining a crushing position.
Oct-17-17  patzer2: For a Black improvement, my preference would be to start in the opening and dispense with the passive 13...g6?! in favor of the more popular moves 13...Nb8 or 13...d5. The Opening Explorer indicates Black has had much better success with these more popular alternatives.

See the hard fought draw Radjabov vs Carlsen, 2014 for a sample of super GM play with 13...Nb8. See the drawn game Navara vs Morozevich, 2016 for a sample of recent play with 13...d5.

Oct-17-17  gofer: Today's POTD is obvious...

<34 Qxh7+ Kxh7>

<35 Rh1+ Bh6>

<36 Rxh6+ Kg7>

<37 Reh1 ...>

but the best continuation is not...

37 ... Rh8
38 Rxh8 Bh5
39 R8xh5 +-

Can black defend and if so how? A few people are proposing Rg8, but that just loses the rook immediately...

<37 ... Rg8>
<38 Bxg8! ...>

The bishop is immune 38 ... Kxg8 39 Rh8+ Kf7/Kg7 40 R1h7#.

Whatever black's next move the bishop simply retreats to e6, d5 or b3 and black is still looking like losing its queen at best or getting mated at worst...

38 ... d5
39 Bd6 +-

38 ... Bf7
39 Bxf7 +-

38 ... Bg6
39 Rxg6 Kf8
40 Bd6 +-

<37 ... Bd7>
<38 Rh7+ Kf8>
<39 Bd5 ...>

It all looks just too horrible!

Oct-17-17  cocker: Not your typical 'easy'.
Oct-17-17  mel gibson: The first few moves are obvious but it takes 20 moves to checkmate. The computer says:

34. Qxh7+ (34. Qxh7+ (♕h5xh7+ ♔h8xh7 ♖f1-h1+ ♗g7-h6 ♖h1xh6+ ♔h7-g7 ♖e1-h1 ♖f8-g8 ♗b3xg8 ♔g7-f8 ♖h6-h8 ♕e7-g7 ♗g8-d5+ ♔f8-e7 ♖h1-h7 ♗e8-f7 ♖h7xg7 ♖d8xh8 ♖g7xf7+ ♔e7-d8 ♗d5xc6 ♔d8-c8 ♘g4xf6 ♔c8-b8 ♖f7-f8+ ♖h8xf8 ♘f6-d7+ ♔b8-c8 ♘d7xf8 ♔c8-b8 ♘f8-d7+) +M20/18 74)

Oct-17-17  morfishine: Though <34.Qxh7+> is obvious, due to White's control of <g8> even the buildup <34.Rh1> works: after 34...Bxh5 35.Rxh5 White maintains the pin on the h-file (along with the control of <g8>)

*****

Oct-17-17  leRevenant: I thought along the same lines as <Phony Benoni> and was surprised that POTD required only the one "knockout punch".
Oct-17-17  TheTamale: Queen sac TUESDAY?? WHAAAAA...????!!!!????
Oct-17-17  Marmot PFL: Easy puzzle for me as I saw the game in person. Kamberi wanted to analyze the game afterward, Polgar just laughed and said there was nothing to analyze.
Oct-17-17
Premium Chessgames Member
  kevin86: Easier start but harder finish...goes on about 20 moves.
Oct-17-17  mriddle: One line I looked at that I haven't seen mentioned yet: 34. Qxh7+ Kxh7
35. Rh1+ Bh6
36. Rxh6+ Kg7
37. Reh1 Rh8
38, Rxh8 Bg6
After which white could trade rooks with 39. Rxd8 and then take the bishop 40. fxg6. This would leave white with B+B+N+R vs Q, which is probably enough to consider it a win, but wasn't totally satisfying. I think 39. R8h6 would be better threatening Rxg6+, or if the bishop moves, Rh7+
Oct-17-17  BOSTER: Maybe it was better to play Nh7 at move ...27,and after hxg5 fxg5 to give more space for bishop g7.
Oct-17-17
Premium Chessgames Member
  Sneaky: Hardly a queen sacrifice—when the smoke clears, you get way more material than a queen is worth. Did I need to see any further than that?
Oct-17-17  swclark25: Thanks for the good analysis <Once> and others. For Black improvement, would 27)...gxf5 have been better than g5?

Seems like g5 helps White open the h-file with the hxg5 exchange.

Oct-17-17
Premium Chessgames Member
  ajk68: 21...f6? is a disastrous move. Black was already in poor shape, but this created the lethal light square weakness around the king. Polgar's reply was not the best (or even one of the top three).

1) +1.31 (28 ply) 21...exd4 22.cxd4 Ne7 23.Bb3 c5 24.bxc5 dxc5 25.Ne5 Bxe5 26.fxe5 c4 27.Bc2 Nc6 28.Ne2 Qa7 29.Qe1 Nxe5 30.Nf4 Nd7 31.a4 Ndf6 32.axb5 Nxe4 33.d5 Qe7 34.bxa6 Nhf6 35.Bd4 g5 36.Bxe4 Nxe4 37.Nh5 Rxd5 38.Nf6+ Nxf6 39.Qxe7 Rxe7 40.Bxf6 Re6 41.a7 Bb7 42.a8=Q+ Bxa8 43.Rxa8+ Kh7

1) +3.56 (33 ply) 22.f5 exd4 23.cxd4 Ne7 24.Bb3+ Kh8 25.Nh4 g5 26.Ng6+ Nxg6 27.fxg6 Nf8 28.Qh5 Bb7 29.Rxf6 Bxe4 30.Raf1 Bxg6 31.Rxg6 Nxg6 32.Bxg5 Rf8 33.Bxd8 Qxd8 34.Qxg6 Rxf1+ 35.Kxf1 Qf6+ 36.Qf5 Qxf5+ 37.Nxf5 Bf6 38.Ke1 Bg5 39.Kd1 Bf6 40.Nxh6 Bxd4 41.Kc2 Bf2 42.g4 Bg3 43.Nf5 Bf4

Oct-17-17  patzer2: <swclark25> If 27...gxf5, Stockfish 8 indicates Black's position is hopeless after 28. Bb3+ Kh7 29. exf5 +- (+5.55 @ 28 depth.)
Oct-18-17
Premium Chessgames Member
  FSR: Very late to the partie, but I would play 34.Qxh7+ Kxh7 35.Rh1+ Bh6 36.Rxh6+ Kg7 37.Reh1 and Black can resign.
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