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| Dec-14-07 | | RandomVisitor: Black was toast after 14...Bxa2??
Kaspy could have sacked the Bishop one move earlier: after 19...cxb6 1: Garry Kasparov - Turbostar (Computer), Hamburg sim-32 (27) 1985 
click for larger view
Analysis by Rybka 2.3.2a mp up:
(19-ply)
1. (4.38): 20.Bxg7 Kxg7 21.Qg5+ Kh8 22.Qf6+ Kg8 23.Re5 Rfe8 24.Rg5+ Kf8 25.Qh6+ Ke7 26.Re5+ Qe6 2. (2.84): 20.Be4 f5 21.Bxc6 Nd5 22.Bxg7 Kxg7 23.Bxd5 Qxd5 24.Rxc7+ Rf7 25.Rxf7+ Qxf7 26.Re7 Kg6 |
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| Dec-14-07 | | tarananakon: what about black plays 28- ..fxe4 29- rh5+ - Qxh5 30- Qxh5 and blacks take 2 rooks for queen, with a reasonable game? |
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| Dec-14-07 | | Aurora: That's too deep for me. |
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| Dec-14-07 | | beenthere240: <taranakon> I think white plays 29. Qh6 + and mate follows pretty quickly because black never gets to trade off his queen. |
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| Dec-14-07 | | tarananakon: after 29 Qh6 mate is not quickly cuz important white squares fo white's attack is occupied by blacks bishop on a2. it would be strange game though |
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| Dec-14-07 | | YouRang: I agree that this was a bit straight-forwardish for a Friday. A fairly typical king assault: 1. Use bishop sac to pry open defense for aggressivly placed queen. 2. Use queen checks to lock king into vulnerable position. 3. Employ a rook-lift or two to threaten mate.
4. Laugh off the feeble efforts to stave off mate, and win. |
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| Dec-14-07 | | karnak64: Ah, good ole' Turbostar. It was the first chess program I ever played against. What a long way they've come since then! |
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Dec-14-07
 | | kevin86: Turbostar? Is Kasparov challenging a sports car? This game must set a record for desperate moves by black to stave off immediate checkmate. It even has a neat discovered check combination to extend things. |
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Dec-14-07
| | kevin86: I count NINE!!! |
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| Dec-14-07 | | green jelly: After 25.Rh5 Rbe8 26.Kg2 black only has spite checks with an unstoppable mate looming. |
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| Dec-14-07 | | HOTDOG: Kasparov made a similar sacrifice in a famous game against Portisch at Niksic |
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| Dec-14-07 | | Oregon104: Solved my first Friday puzzle... I'm getting better I reckon. |
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| Dec-14-07 | | SAINTAMANT: How about Qg5, Pg6 22. Qh6 QxB 23. RxQ |
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| Dec-14-07 | | zenpharaohs: SAINTAMANT: "How about Qg5, Pg6 22. Qh6 QxB 23. RxQ" 21. Qg5 f6
White has blown his chance.
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| Dec-14-07 | | alphee: It's been a painfull search and my first thought 21.♗xg7 ♔xg7 22.♕g5+ ♔h8
23.♕f6+ ♔g8 was right even as nothing else did bring any significant plan ... 21. Qxh7+ Kxh7 22. Be4+ Kh8 23. ... or
21. Re8 Raxe8 22. Bxe8 Rxe8 23. Bxg7 Kxg7 24. Qg5+ or
21. Be8 Rfxe8 22. Rxe8+ Rxe8 23. Re1 Rf8 or
....
but I could not guess the following moves.
It's what would have played ... with fingers crossed may be. |
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Dec-14-07
 | | johnlspouge: Friday (Difficult)
White to move, down a pawn for the minor exchange, with an advantage in space and good piece coordination against the K-side. A sac against the K is desirable, because slower moves permit the Black pieces to regroup over to the K-side. The Qxh7 sac seems to be infeasible, so we calculate 21.Bxg7 Kxg7 22.Qg5+ Kh8 23.Qf6+ Kg8 24.Rd4
23.Qf6+ is important to nail the ♙f7 down, to narrow the choice of defenses. Possible defenses include
24...Qe6 25.Rxe6  (which can occur in lines below)
24...h4 25.Rd5 (which leads to a line like the next)
24...Rd8 25.Rg4+ Kf8 26.Rce1 with Q# to follow.
Thus, the Bxg7 sacrifice is both tactically justified and strategically consonant with the position (a K-side attack). There is no tactical weakness for Black to exploit. According to <UdayanOwen>'s brilliant posts yesterday, without further calculation, it must be a good move. I wonder if Kasparov found something better. Time to peek. Yep, Garry can still teach me something. He thought 24.Rc5 better, because the Re1 already cuts off the ♔'s flight. Maybe there are arguments for the 24.Rd4 line and its nullification of the ♙h6, because the ♘b6 can not interfere with the Re1's movement along its file. Time to look at the discussion. Is Kasparov the final arbiter of my Friday points, or is <dzechiel>? :) And may I get some extra points for calculating the kibitzing as well as the puzzle? |
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| Dec-14-07 | | DukeAlba: It was pretty easy for a Friday puzzle... 21.Bxg7 was the first move I jumped on and it ended up being the right one. |
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| Dec-14-07 | | Mendrys: Drats, I didn't get this one. Instead of 31...Nd5 I wanted 31...Bd5. drats. Actually this was, as <YouRang> said, a little too straightforward for a friday. LOL that was funny seeing black throw his pieces away. It reminds me of what Chessmaster on my old Atari would do when confronted with an inevitible mate. |
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| Dec-14-07 | | keklik: Got it immediately!! Heh, strange, I see first move, but I can't calculate the rest of the attack. Probably this is the reason why I've never been a World Champion. And Kaspy won't become first chess World Champion to be called 'mr. president'. How disappointing. Anyway, best wishes for his party! Hope they'll strike back one day. |
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| Dec-14-07 | | ConstantImprovement: At first glance it looks like a typical sacrifice position, but there probably is more to it. Initial ideas and characterisitics:
1. The diagonal h8-a1, where the queen can reinforce the bishop's aim
2. The potential weak point g7
3. A rook maneuver to the g-file
4. Bringing the white bishop to h7-b1
5. f5 as a defense with a possible Re7-followup
Concrete tries:
A. Qg5 (Qg4), forcing g6 or f6
B. Bg7:, probably forcing Kg7:
C. Re4
D. Bd4
A. 21. Qg5 f6 (g6 22. Qf6, winning), and now the only serious try 22. Re7 does not work: 22. ... Rf7 23. Bf6: Re7: or 22. ... g5: 23. Rg7:+ Kh8 24. Ba1!? (24. R anywhere Qc3:, winning for Black). After 24. ... h5 it is some more moves than usual to see but I will try: 25. Rg5:+ Kh7 26. Bd4+ Kh6 27. Bg7+ Kg5: 28. h4+ Kg4 29. f3+ Rf3: (Kh3? 30. Kf2 Kh2 [Rf3:+ 31. Bf3: and even Qc2+ 32. Rc2: won't stop the mate] 31. f4! Rf4:+ 32. f4: Kh3 33. Bf3 and mate) and the attack is over. There does not seem to be a promising 29th move for White. B. 21. Bg7: Kg7: (Is probably forced) 22. Qg5+ Kh8 23. Qf6+ Kg8 1. 24. Re5 24. ... h6
1a. 25. Qh6:?
1a1. 25. ... f6 26. Qg6+ Kh8 27. Rh5#
1a2. 25. ... Qe6 26. Rg5+ Qg6 27. Rg6:+ g6: 28. Qg6:+ Kh8 29. Bd4, winning
1a3. 25. ... f5! 26. Re7 Rf7 and Black defends
1b. 25. Rh5? Qe6, winning
1c. 25. Re4 h5 (Kh7 26. Bd4+) 26. Re5 Rd8 27. Re1! Rd8 28. Rg5+ Kf8 29. Re1! Qe6 30. Re6: Be6 31. Rg7 with Rh7: and Rh8# to follow. 2. 24. ... Rd8 25. Rg5+ Kf8 26. Re1! as above.
Is it that 'easy' (Relatively easy for the day, since the lines after 24. Re5 were no really serious defenses and the line until 24. Re5 is rather trivial to find.)?
The problem is that a pawn move instead of 21. ... Kg7: is silly, since it gives up the exchange for nothing and will lose. Something like 21. ... Rd8 loses, too, because of 22. Bf6 and there will be a mate in two on g7. For the sake of completeness:
C. 21. Re4 had a nice idea (21. ... something bad 22. Qf6 f6: 23. Rg4+ Kh8 24. Bf6:#), but 21. ... f6 spoils it. Conclusion:
The main line is:
21. Bg7: Kg7: 22. Qg5+ Kh8 23. Qf6+ Kg8 24. Re5 h6 25. Re4 h5 26. Re5 Rd8 27. Rg5+ Kf8 28. Re1! winning because of the threat 29. Qh8#, which can not be parried adequately. |
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| Dec-14-07 | | tal lover: missed that one
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| Dec-17-07 | | patzer2: Kasparov demolishes a realatively weak Chess computer and the Black pawn structure with 21. Bxg7!! for the Friday, December 14th puzzle solution. |
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Dec-19-07
 | | Eggman: 
click for larger view<<what about black plays 28- ..fxe4 29- rh5+ - Qxh5 30- Qxh5 and blacks take 2 rooks for queen, with a reasonable game?>> No, <tarananakon> there follows instead 29.Qh6+ Kg8 30.Rg5+ Kf7 31.Rg7# |
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Sep-30-20
 | | fredthebear: Eggman has been around this site a long time. Eggs are naturally good for us! |
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Oct-01-20
 | | carpovius: Turbo is OK. Star is too ambitious)) |
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Kibitzing
sac: 21.Bxg7