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

ANALYSIS [x]

FEN COPIED

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Given 43 times; par: 29 [what's this?]

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

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Aug-21-21  Stanco: I thought it was 11.Bxh7+ but AI suggests 11.Nf3! Symptomatically, with Bxh7+ black light square bishop with a6-d3 manoeuvre is swift to claim for the the same diagonal his white colleague has just gave up.
Aug-21-21
Premium Chessgames Member
  pittpanther: goodevans, in your diagram I believe 17 h5 followed by h6 wins. I do not see how black can survive that simple assault.
Aug-21-21
Premium Chessgames Member
  chrisowen: O Yes harangue no win scratch
Aug-21-21
Premium Chessgames Member
  chrisowen: O bucket aid no f3 or h7 no?
Aug-21-21
Premium Chessgames Member
  chrisowen: Cuff bishop great no?
Aug-21-21  goodevans: <pittpanther> 17.h5 allows 17...Bxg5 and White no longer is able to recapture with the pawn.

Not only has White lost his powerful N but the B on g5 provides extra cover for the h6 square (likewise Black's Q if White chooses to exchange Bs) rendering a further advance of the pawn harmless.

Aug-21-21  Walter Glattke: 13.-g6 14. Qh6 Re8 15.Bg5 (15.h5? Ng5? Bf8) Bf8 16.Bxd8 Bxh6 a draw?
Aug-21-21
Premium Chessgames Member
  chrisowen: Boggled no where's the win?
Aug-21-21  goodevans: <Walter Glattke> If Black can get 15...Bf8 in safely then far from being a draw, Black's actually winning. But...

<13...g6 14.Qh6 Re8 15.Ng5 Bf8?? 16.Qh7#> is mate so Black must instead play <15...Nf8>. Now the B can't get to f8 to harass the Q so White just continues his attack with <16.h5> with devastating effect.

Aug-21-21
Premium Chessgames Member
  An Englishman: Good Morning: <Brenin> makes a very good argument in favor of the sacrifice. However, myself playing White, probably would have won with Nf3 and might have lost with Bxh7+. The debate looks like a draw; both moves should receive full credit for solving the puzzle.
Aug-21-21  QueenMe: The GREATER challenge: figure out when opponent will resign! (They consistently pick the weirdest place to give up, don't they?)
Aug-21-21
Premium Chessgames Member
  pittpanther: Goodevans, if black takes the knight (17. h5 Bxg5 then just push 18 h6 and black has no defense
Aug-21-21  goodevans: <pittpanther> 17.h5 Bxg5 18.h6 gxh6 then what?


click for larger view

If 19.Rh5 to put pressure on g5 then 19...Re7 forces a trade of Bs and Qs leaving Black with a winning advantage.

Aug-21-21  Walter Glattke: Goodevans, I played too quick. First I had a counter sac by searching the draw, and suddenly it was off. 16.-Bf6 17.hxg6 fxg6 18.exf6 Qxf6 or 17.exf6 Qxf6 18.hxg6 fxg6 -+ For the Moment I see no win for White.
Aug-21-21  Walter Glattke: Potter Fenton, kibitzer Saavedra / Stockfish gives +2.51 for 13.-f5, but what about with sudden kickback 13.-g6!? Where is my mistake against the allmighty computer?
Aug-21-21  GufeldsVengeance: You guys should realize the moves played do not work---Nf3 and Qh5 win. Bxh7 is likely to win, as a practical matter, but leaves black with a brilliant defense:

11.Bxh7, Kxh7 12.Qh5, Kg8 13.Nf3, Ba6! 14. Ng5, Bd3! And if 14.Rd1 instead of Ng5, Re8 15. Ng5, Nf8 is strong.

So, it doesn't work.

Aug-21-21
Premium Chessgames Member
  keypusher: A few random thoughts.

1. Really illuminating posts by <good evans>, especially V Kovacevic vs Ree, 1980 (kibitz #58). Hard to believe that single tempo Black gains via 13....Ba6 14.Rd1 can make the difference between a win and a draw, but SF confirms that it does. I think I could look at this position for a year without realizing that 13....Ba6, 14....Re8, 15....Nf8 was the only defense.

2. If the position after 13....f6 was a Sunday puzzle 13 years ago, how can the position after 10....Nd7 be a Saturday puzzle now? Pretty sure we were all looking at 11.Bxh7+, which isn't even the best move, though I think <Brenin> is right that it's going to win against any opponent any of us are likely to see outside of a simul.

3. Hard to believe that Black is busted after 10 moves. But it's true. This game is a pretty good advertisement for the London System.

Aug-21-21  goodevans: <Walter Glattke> Here's the position after your 16...Bf6 17.hxg6 fxg6 18.exf6 Qxf6:


click for larger view

Material is equal but Black is hanging on by a thread. In particular, Black's N is the only thing stopping a devastating check on h7.

... so we attack it - 19.Bd6.

Black cannot both protect h7 and save the N.

Aug-21-21  Walter Glattke: Don't know, what you mean - 19.-Qg7 20.Bxf8 Rxf8
Aug-21-21
Premium Chessgames Member
  Teyss: <goodevans> Illuminating posts as <keypusher> said. It always fascinates me how a move on one edge of the board (13...Ba6) influences the other edge (the threatened BK).

<Brenin> Very interesting thought about best moves vs practice. Maybe it's a matter of personal mindset (I tend to be more interested in theory but fully respect the hands-on approach) and activity (playing more or less games with different opponents and formats).

Aug-21-21
Premium Chessgames Member
  keypusher: <Walter Glattke: Don't know, what you mean - 19.-Qg7 20.Bxf8 Rxf8>

19....Qg7 20.Qxg7+! Kxg7 21.Be5+ mates. Hard to see.

Aug-21-21  Walter Glattke: Ok, the clearing, 21.-Kg8 22.Rh8# over elo 3000, congrats to you and stockfish with 13.-f5
Aug-21-21  olinart: My try was Bxh7+ Kxh7 12. Qc2+ g6 >(>forced) 13. h5 Kg7 14. hxg6 fxg6 15. Bh6+ Kf7 16. Bxf8 Qxf8 17. Rh7+ Ke8 18. Qxg6+ Kd8

I think black holds 14. h6 easily, but white has an advantage in this line.

Aug-22-21
Premium Chessgames Member
  keypusher: <olinart: My try was Bxh7+ Kxh7 12. Qc2+ g6 >(>forced) 13. h5 Kg7 14. hxg6 fxg6 15. Bh6+ Kf7 16. Bxf8 Qxf8 17. Rh7+ Ke8 18. Qxg6+ Kd8>

12....g6 isn't forced. After 12....Kg8 White's just lost a bishop for very little, viz. 13.Nf3 c4 (or 13....f5) 14.Ng5 Bxg5 15.hxg5 g6 16.Rh6 Kg7.

Aug-23-21
Premium Chessgames Member
  Dionysius1: <<goodevans> Illuminating posts as <keypusher> said. It always fascinates me how a move on one edge of the board (13...Ba6) influences the other edge (the threatened BK).>

I wonder if there's such a variant as cylindrical chess, where a Knight on A1 could move to h3 for example?

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