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Vladimir Kovacevic vs Hans Ree
Maribor (1980), rd 2, Oct-??
Formation: Queen Pawn Game: London System (D02)  ·  1-0
ANALYSIS [x]

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sac: 11.Bxh7+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Sep-09-07  Marmot PFL: White has sacrificed a piece and must attack on the h file so play is forced for several moves and not hard to find. Black could have improved his defense at several points starting with 15...Bxg5. After all with two extra pieces the idea of returning material to break the attack is very plausible. After 16.Bxg5 Qc7 I can't find a win for white - 17.Qh7+ Kf7 18.Rxh3 Nxe5 18.Bf4 Ke8 19.Qh5+ g6 20.Qxe5 Qxe5 etc is but probably drawn. 17.f4 as suggested above looks stronger and perhaps winning. This qualifies as a true sacrifice in that no mate or immediate material gain is apparent, just a strong attack as compensation.
Sep-09-07  pawnofdoom: This is too easy for an "insane" problem. I got this one faster than I normally get the Thursday and Friday and Saturday problems. The only way white could really make progress was to attack, and with just those two minor pieces, it was easy for black to defend. Black's h-file was open to attack, so all that needed to happen was to clear the h-flie for White's rook. And Ng5 easily did that, and the capture was pretty much forced.
Sep-09-07  TrueBlue: not to bad for a Sunday! First move was obvious. Saw it up to:

14. Ng5 fxg5 15. hxg5 Rf5 16. Qh7+ Kf7 17. g6+ Ke8 18. Qxg7 (not bad 4 moves ahead, but it was pretty forced!)

Than black has Bf8 or Nxe5 and we get several variations ... Incredible how I get stuck on Wednesday puzzles and solve Sundays ...

Sep-09-07  midwood2001: What is white's reply to 23 ...Qe7
Sep-09-07
Premium Chessgames Member
  OBIT: Claiming you solved this one to setting up the board and making the moves Black played doesn't prove anything, since Black didn't defend well. 15...Rf5 is a clear losing move. As Dilbertarian said, the key line is 15... Bxg5 16 Bxg5 Qc7! (not 16...Qe8? 17. Qh7+ Kf7 18. Rh4!), which is where I got stuck when I analyzed this. However, I think Alphastar has the right idea: 17. f4! is not immediately forcing, but Black's cramped position prevents him from organizing an effective defense. Despite being a piece down, White does not have to rush his attack.

* * * * *

On second thought, after 17. f4, take the pawn anyway: 17...Nxe5! and if 18. fxe5 Qxe5. Black gives the piece back to uncramp his position. White is still a pawn down, and where is his attack?

Sep-09-07  ellhares: 18...♗f8?is a very bad defensive move black should play ♘f8! here with chance to draw♘f8 give the king the squar(d7) to escape and now if white play (♕a8) black replay with (♔d7!)he is up two peices now and he could use them to hold on against the coming pawns! and also black has alot of good defensive plans after that like ♖f4! and all white attack will be finsh in my oponion black had a real chance to draw and even win if white didnt manage a good attack but black here gave the worst defensiv moves can be played !!
Sep-09-07  Marmot PFL: <On second thought, after 17. f4, take the pawn anyway: 17...Nxe5! and if 18. fxe5 Qxe5. Black gives the piece back to uncramp his position. White is still a pawn down, and where is his attack?>

This seems to lose to 19.Qh7+ Kf7 20.0-0+ Ke8 21.Qg6+ winning the Rf8

Sep-09-07  chessamateur: I didn't even try, lol.
Sep-09-07
Premium Chessgames Member
  patzer2: Today's Sunday puzzle solution features the 14. Ng5! follow-up to the demolition of pawn structure sacrifice 11. Bxh7+!?

Perhaps the possibility 13...Ba6!, preparing to defend and hold the position with 14...Bd6 to (as pointed out by <Alphastar>), is why today's puzzle begins with the 14. Ng5! followup.

The suggested improvement 17. f4! by <Alphastar> makes for a good study in attacking, positional chess.

Sep-09-07  MindWalk: ConstantImprovement: You give this line: "a2. 18. Rh6 with the idea 0-0-0, Rh1 and then Qg6+, Kg8, Rh1#, but Ke7 to escape via d8 seems to defend." But there's a Bishop on g5; how can the King escape via e7 to d8? What I *do* see is 18. Rh6 Nxe5, and if 19. Rf6+, *then* the King escapes to d6 via e7.

Also, why isn't there an a13. 18...Nxe5 ? How is White to continue his attack? As MarmotPFL later pointed out, 18. Rf4 would be better.

Sep-09-07
Premium Chessgames Member
  OBIT: <Marmot PFL>Good point. Even better than 21. Qg6+ is 21. Rxf8+! Kxf8 22. Rf1+ Ke8 23. Qg8+ Kd7 24. Rf7+ Kd6 25. Qd8+ Kc6 26. Qe8+ Kd6 27. Be7mate. Sneaky how that f-file opened up. :)
Sep-09-07
Premium Chessgames Member
  fm avari viraf: Though it is tough one but still I feel that 14.Ng5 is the right move as it threatens mate & Black has no choice but to accept it 14...fxg5 15.hxg5 Rf5 as White was threatening g6 16.Qh7+ Kf7 17.g6+ Ke8 18.Qxg7 Bf8 [here, whether ...Nf8 is playable or not is a moot question ]19.Qh8 looks logical but even 19.Qg8 would also serve the purpose. Indeed, it's difficult for Black to survive the onslaught of White's furious attack.
Sep-09-07  midwood2001: again, what is white's reply to 23 ... Qe7
Sep-09-07  sezori: With Ng5 there are three threats and also three variations that could occur.

1. With what I see after Ng5 it threatens a knight fork on the queen and the rook next move

2. If the knight isn't taken then mate would be inevitable.

3. Lastly the idea I seen behind the knight sacrafice was to open up the h file so that the queen could be supported by the rook in a battery on h7.

Nothing too hard to spot if you look at the WHOLE BOARD.

Sep-09-07  ConstantImprovement: To MindWalk:

I think Marmot mentioned 18. Bf4, 18. Rf4 is an illegal move.

I do not think that 18. ... Ne5: is a viable alternative. After 19. Rf6+ Ke7 (the only move) there can follow:

20. Qg7:+

1. 20. ... Kd6 21. Rf8:, winning.

a. 21. ... Qc6 Qe7#

b. 21. ... Qd7

b1. 22. Rd8 winning

b2. 22. Qe5:+ Ke5 23. Bf4+ Ke4 24. 0-0-0 d4 25. c4 e3: 26. f3#

c. 21. ... Qb5 (a4) 22. Qe7+ Kc6 23. Rc8:+ Rc8: 24. Qe6:+ Kb7 25. Qe5:, winning.

2. 20. ... Rf7 21. Rf7:++ (double check) Kd6 22. Rf8 with 23. Qe5:+ following or domination after 22. ... Nd3+ 23. Kd2 Qb5 24. Qe8+ winning.

3. 20. ... Nf7 21. Rf7:++ Kd6 22. Rf8: winning

So it was a negligible omission to not consider 18. ... Ne5:, but it lead to some interesting sacrifical lines remaining undiscovered. Good that you mentioned the move, albeit it did not substantially change anything.

Sep-09-07  GoldenKnight: This was not that difficult.
Sep-09-07  MikeB20: midwood2001,

After 23 ... Qe7 24. Bf6 Qxh7 25. Rxh7ch followed by 26. Bxg5 wins.

Sep-09-07  Fezzik: I got as far as move 19 and came to the opposite conclusion that FM Viraf did. I thought Black was hanging on with ideas such as Qe7.

It looks like I was wrong. In a fast time control I probably would have played 14.Ng5, but I doubt I would have found it convincing enough to play in a longer game.

(To make a long story short, I don't give myself any credit for today.)

Sep-09-07  RookFile: Black's 6th move in this game, 6....0-0 was unwise. Grandmasters like Petrosian would have delayed castling and fought for control of e5 first.
Sep-09-07
Premium Chessgames Member
  kevin86: The puzzle itself is insane,but the first few moves are easy. It looks like white's win is along the h-file and the eighth rank.
Sep-10-07  MostlyAverageJoe: Initially, I thought that the puzzle would be even more insane if it started after the first 10 moves, with the object of finding 11.Bxh7. The response, Kxh7 is forced (otherwise white has a forced mate in 6). 12 ... Kg8 is forced as well. The question is: could black do anything better than 13...f6? and I see that <Alphastar> has already answered it.

So it seems here that 11.Bxh7 was a speculative move, hoping for the black to make a mistake, while being failry safe in that it gives white a draw if black plays perfectly. Very neat.

Sep-10-07  znprdx: <MostlyAverageJoe: The question is: could black do anything better than 13...f6? and I see that <Alphastar> has already answered it.> As pretty as 13...Ba6 appears 14.Kd2 potentially adds the queen rook (probably along the 'g'file) to this indefensable attack.
Sep-11-07  Alphastar: <znprdx: As pretty as 13...Ba6 appears 14.Kd2 potentially adds the queen rook (probably along the 'g'file) to this indefensable attack.>

14. Kd2? d4! when 15. Ng5 still seems winning, but is actually losing because of 15. ..Nf6!! eg 16. exf6 dxc3++ 17. Kc2 (Kxc3 Qd3#) Qd2+ 18. Kb3 Qxb2+ 19. Ka4 Qb4#.

Mar-11-11  Paul123: I just finished studying this game... I second others when they commented on what a masterpiece this game is. To make the sac of 11.Bxh7! showed a positional as well as combative foresight few in the game of chess have. Great player also
Sep-23-12  senojes: According to Kovacevic in his co-authored book, "Win with the London System" (2005), instead of 13...f6, 13...Ba6 with the idea of 14...Bd3 defending h7, holds the game. If then 14. Rd1 (not 14. O-O-O Be2!) Re8; 15. Ng5 Nf8; 16. Qxf7+ Kh8; 17. b3 Qd7; and white must be satisfied with perpetual check in view of the threat of 18...Bd8.
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