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Jonathan Penrose vs Milko Bobotsov
Palma de Mallorca (1969), Palma ESP, rd 8, Dec-01
Alekhine Defense: Modern Variation. Main Line (B05)  ·  1-0

ANALYSIS [x]

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sac: 22.Bxg7 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Jan-11-08  mkrk17: Looks like i'm first here. White's attack is obvious. Bxg7 destorys the kings cover. I dont see solid variations. But after Kxg7, white has moves like Rd5 which bring the rook closer to attacking the king, along with the queen which is already on f3.
Jan-11-08  TrueBlue: I believe the obvious Rd5 works here, anyone can prove me wrong? Bishop sacrifice is to follow.
Jan-11-08  TrueBlue: ok, I had the same first few moves, just the first two moves reversed
Jan-11-08
Premium Chessgames Member
  Ken MacGillivray: After 27. Qh6+, if black avoids the immediate loss of his Queen with 27... Qg7; A forced checkmate follows with 27... Ke8 28.Rg8+ Kd7 29.Rd1+ Kc7 30.Qd6#
Jan-11-08  Terry McCracken: Very easy for a Friday, 22. Bxg7! and Black can't cope with the prospect of 23. Rd5! followed by 24. Rg5+.
Jan-11-08
Premium Chessgames Member
  patzer2: For today's puzzle solution, the demolition of pawn structure 22. Bxg7!! is followed by the deflection 3. Rd5! to prepare a decisive attack on Black's helpless King. In the final position, White has a mating attack underway.
Jan-11-08  podjevsky: I think Rd5 first looks as good, perhaps someone with an engine can tell the difference?
Jan-11-08  zooter: Is it my imagination that 22.Bxg7 Kxg7 is followed by 23.Rd5 with a winning attack?

Also, i'm trying hard to figure out if the bishop sacrifice is really required or a direct Rd5 would work, but i'm leaning towards sacrificing the bishop to expose the king and get into a mating attack....time to check

Jan-11-08  dzechiel: White to move. Black is up a pawn. "Difficult".

If white gives black half a chance, black will trade the minor pieces and head for the endgame a pawn up. It's time to take action now.

There are two tempting candidate moves:

- 22 Bxg7
- 22 Rd5

I feel strongly that these are the first two moves of the combination, and it may not matter what order they are played, but I will choose

22 Rd5

because if I played 22 Bxg7 first, black could respond 22...Kxg7 23 Rd5 Qxd5.

So, where does black move the queen? I think

22...Qc7

is probably his best chance (but 22...Qc6 and 22...Qc8 should be considered as well). Now...

23 Bxg7 Kxg7

This is one of those positions where you really can't ignore the sacrifice. Yes, it only restores material equality, but it also rips open black's castled position. The natural follow up is

24 Rg5+

Anything besides

24...Kf8

leads to 25 Qxh5#. Now is where white has to choose the right move. One possibility is

25 Qf6

with the simple threat of 26 Rxh5 and 27 Rh8#. Black can't play 25...Qe7 as that allows 26 Qh8#. And 25...Re6 lets white pick up an exchange with 26 Qh8+ Ke7 27 Qxa8.

Well, it's getting late and I'm interested to see this game. Time for me to check.

Jan-11-08  D.Observer: Could white lose with 22.♕xb7?
Jan-11-08  zooter: Can somebody please explain to me the various mating threats that White has after 25.Qf6 and the best possible black defenses? Thanks in advance...
Jan-11-08  zooter: <D.Observer: Could white lose with 22.Qxb7?>Yes he would as his bishop on c3 will be happily gobbled by the knight
Jan-11-08  MaxxLange: far easier than most Fridays: Bxg7 cries out to be played, and the forcing play after does not have very many branches
Jan-11-08  MaxxLange: In the problem position, black threatens simply NxB, to play an ending with an outside a-pawn. After Bxg7, that Black Knight is useless! It will take 2 moves to get back to defend the Kingside; meanwhile White destroys the King's position and gets a mating attack with Queen and Rook.
Jan-11-08  littlefermat: TrueBlue,

I think 22 Rd5 is wrong since black could play 22...Qc7 and white couldn't make the pawn grab at move 26.

And any other forcing moves, like a check at h6 or g7 would allow the king to escape to e7.

Can't say if my analysis is perfect. Right now, it's 2 am where I live. :)

Jan-11-08  cyruslaihy: i did Rd5 before Bxg7 and of course i did not see t to the end
Jan-11-08  mcgarrett: zooter: "Can somebody please explain to me the various mating threats that White has after 25.Qf6 and the best possible black defenses? Thanks in advance..."

White's Qf6 threatens Rxh5 after which mate by Rh8 is unavoidable.

Jan-11-08  TheaN: 4.5/5

After I failed yesterday, which I thought was harder than today (I only found Nf4 with accepting tge sac, so I didn't post), I didn't think this one through too much and quit after:

22.Bxg7 Kxg7 (as said, the position with a decline is worse) 23.Rd5 and Black will be ripped apart by White's major pieces. The Black Knight is too far away.

<I think 22 Rd5 is wrong since black could play 22...Qc7 and white couldn't make the pawn grab at move 26.>

This I don't get. After 22.Bxg7 Kxg7 23.Rd5, Qc7 is the best defense anyway. Whether that arises from 22.Rd5 or 23.Rd5 doesn't matter. The drawback and losing part of Qc7 is that e1 is left uncovered. After Ke7 which is going to be the only Black move at a certain point, Re1+ probably wins.

Jan-11-08  moppa: I planned Rd5 foolowed by Bf6, in order to gain a classic mating position with queen on f6 and rook on the h-file. So, 22.Rd5 Qc7 23.Bf6 gxf6 24.Qxf6 Re6 25.Rg5+ Kf8 26.Qh8+ Ke7 and white has the safety-net 27.Qxa8 though there might be some checking left.
Jan-11-08  willyfly: Black is up by a ♙ and has a ♘ dim on the rim ready to capture the c3♗. White has two immediate threats ♗xg7 and ♖d5. I like ♖d5 because it forces the ♕ to retreat to c6 or c7 or c8 or b6 or maybe even a3. All of these effectively remove the ♕ from the action but at least ♕c7 offers some protection of the ♙s in front of the ♔.

22 ♖d5 ♕c7 23 ♗xg7 and what's a ♔ to do? If Black declines the ♗ and plays 23...♔h7 then it's 24 ♕f6 and mate in a few moves.

But in capturing the ♗ Black actually creates an escape square (f8) and then it's a case of chase the ♔ providing many opportunities for White. Let's look and see what really happened.

-----
It seems to me that playing ♗xg7 first allows Black a better flight square for the ♕ (b4) after White plays the ♖ to d5. I'll have to read the kibitzing.

Jan-11-08  realbrob: I don't think this was so difficult actually.. I got it in around 30 seconds, first I thought of Rd5 followed by Bxg7 and then reversed the order - so Bxg7 followed by Rd5. Since I'm not a great player probably the puzzle is less difficult than a normal Friday... Nice attack, anyway.
Jan-11-08  Samagonka: Friday puzzles are generally harder than this: coz even a lay-low player like I could consider at least Bxg7 followed by Rd5. The white Queen now has a wide sphere of attack and mate is imminent because the Black King is too exposed to flee from the back rank.
Jan-11-08  Eurotrash: I first looked at Bxg7, but decided on Rd5, like many others here.
Jan-11-08  Shakalul: What if 22...Qg5?
Jan-11-08  zooter: <Shakalul: What if 22...Qg5?> Well, probably 23.Bf6 with the threat of Rd5 followed by Rg5

Also, look at how many of black's pawns are undefended...the d6 and b7 are free pickings too....the knight is admiring the scenery beyond the board (sitting on the edge) and probably cannot help much :)

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