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Thread: The Bxh7 Thread

  1. #226
    CC Grandmaster Capablanca-Fan's Avatar
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    James Peirce vs Patrick Grace
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    Last edited by Capablanca-Fan; 04-11-2015 at 08:07 AM.
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  2. #227
    Monster of the deep Kevin Bonham's Avatar
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    Your name is Anna Muzychuk and you are one down with two games left against your upstart Chinese opponent who has just played 13...b5. Do you feel lucky? Apart from feeling lucky to be Anna Muzychuk, that is?

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    Last edited by Kevin Bonham; 01-03-2017 at 11:18 PM.
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  3. #228
    CC Grandmaster Basil's Avatar
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    I'm plonking for yep. Do tell.
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  4. #229
    Monster of the deep Kevin Bonham's Avatar
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    White played the sacrifice and black was smashed. (Actually 21.Qxe6+ would have ended the game several moves earlier.) The smashing method involving a second piece sac in the centre is unusual.

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    13...b5?? enabled the sac by both unprotecting the knight on c6 and blocking the queen's defence of d5, thereby allowing 17.Nxd5 to work (if black takes back, white will take on d5 and c6 then swing to g6 and all over). Other 13th moves by black would have avoided this.
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  5. #230
    CC International Master Agent Smith's Avatar
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    Rogers wrote up this game, though not quite Bxh7

    [Event "Sharjah Grand Prix 2017"]
    [Site "Sharjah UAE"]
    [Date "2017.02.24"]
    [Round "6.6"]
    [White "Nepomniachtchi, Ian"]
    [Black "Li, Chao b"]
    [Result "1-0"]
    [WhiteElo "2749"]
    [BlackElo "2720"]
    [ECO "C42"]
    [EventDate "2017.02.18"]
    [WhiteTitle "GM"]
    [BlackTitle "GM"]
    [Opening "Petrov"]
    [Variation "classical attack, Marshall variation"]
    [WhiteFideId "4168119"]
    [BlackFideId "8604436"]
    [Annotator "Rogers"]

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  6. #231
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    Quote Originally Posted by Kevin Bonham View Post
    13...b5?? enabled the sac by both unprotecting the knight on c6 and blocking the queen's defence of d5, thereby allowing 17.Nxd5 to work (if black takes back, white will take on d5 and c6 then swing to g6 and all over). Other 13th moves by black would have avoided this.
    13... b5 might make it easier for Anna to find a win but other moves on the Queen side would be blunders too. The weakness of the c6 knight was not very important as 17. Nxd5 was not the only move to continue the attack (17. Qe2 seems even stronger). I think Tan didn't have to keep the knight protected - she should have prevented the Bxh7 shot in the first place. Bxh7 became possible only after 13. h4, so that the *h* pawn was ready to recapture the bishop on g5 opening the h file. Tan didn't pay attention to that strong pawn move.

  7. #232
    CC Grandmaster Desmond's Avatar
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    Position I had in a rapid game. What do you think, should white go for the bishop sac? What's the evaluation, does it win? Does white have better? Will post the answer and game continuation (which may or may not be the same ) after people have a chance to work it out.

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  8. #233
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    Quote Originally Posted by Desmond View Post
    Position I had in a rapid game. What do you think, should white go for the bishop sac? What's the evaluation, does it win? Does white have better? Will post the answer and game continuation (which may or may not be the same ) after people have a chance to work it out.
    I think the sac is sound. Assuming Black accepts, and White then checks with Ng5: Kg8 seems fatal after Qh5, while Kh6 or Kg6 allows Qg4 (possibly followed by Nce4). I can't find anything better.

    According to Vukovic, the sac should work:
    Vukovic.JPG

  9. #234
    CC Grandmaster Desmond's Avatar
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    Quote Originally Posted by Desmond View Post
    Position I had in a rapid game. What do you think, should white go for the bishop sac? What's the evaluation, does it win? Does white have better? Will post the answer and game continuation (which may or may not be the same ) after people have a chance to work it out.

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    Quote Originally Posted by Patrick Byrom View Post
    I think the sac is sound. Assuming Black accepts, and White then checks with Ng5: Kg8 seems fatal after Qh5, while Kh6 or Kg6 allows Qg4 (possibly followed by Nce4). I can't find anything better.

    According to Vukovic, the sac should work:
    Vukovic.JPG
    Yes Patrick pretty much has it. The computer recommends the sac +3 and for black to decline the sac with ...Kh8. Second choice is to accept and go ...Kg6 Qg4, though I played h4 instead. I missed a few of the best lines but had a strong attack and won in the end.

    I was surprised to see that the computer also recommended b4 instead of the immediate bishop sac, as almost as strong a line. To be honest this move would never occur to me as the loose knight on a5 is nice to have when you're bringing the queen to h5.


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  10. #235
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    Quote Originally Posted by Desmond View Post
    Yes Patrick pretty much has it. The computer recommends the sac +3 and for black to decline the sac with ...Kh8. Second choice is to accept and go ...Kg6 Qg4, though I played h4 instead. I missed a few of the best lines but had a strong attack and won in the end. I was surprised to see that the computer also recommended b4 instead of the immediate bishop sac, as almost as strong a line. To be honest this move would never occur to me as the loose knight on a5 is nice to have when you're bringing the queen to h5.


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    Nice game. I'm glad I got the basics correct, but I can't take too much credit - I got most of it from Vukovic, whose book I highly recommend. In a rapid game, I would definitely play the sacrifice, as it's very hard to defend accurately with limited time (as we can see from the game).

  11. #236
    CC Grandmaster Desmond's Avatar
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    Quote Originally Posted by Patrick Byrom View Post
    Nice game. I'm glad I got the basics correct, but I can't take too much credit - I got most of it from Vukovic, whose book I highly recommend. In a rapid game, I would definitely play the sacrifice, as it's very hard to defend accurately with limited time (as we can see from the game).
    Thanks.

    Yes I think it's a good general rule, though my position was a little different. I didn't have the pawn on e5 and the DSB I already used to lure the knight away from f6.

    I think Q + 2 pieces is certainly enough. I've seem to recall reading some book where it said you could count the pawn on e5 as a "piece" in that sense, because it's keeping the king in but also importantly making it harder for black to bring pieces into the defence Eg via f6.

    I also think even apart from the Bxh7 sacs, counting the number of pieces you can quickly bring to the attack and the amount of defenders likewise, if you have a +3 score there for pieces, you've got a pretty goods chance there's a win there. In this case I had Q+2N+R. Black kind of had Q+N but neither could really get to ideal squares in time.
    So what's your excuse? To run like the devil's chasing you.

    See you in another life, brotha.

  12. #237
    CC Grandmaster Capablanca-Fan's Avatar
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    Good intuition. The variation with 16. Qg4 is very elegant.
    “The history of the 20th century is full of examples of countries that set out to redistribute wealth and ended up redistributing poverty.”
    “There’s no point blaming the tragedies of socialism on the flaws or corruption of particular leaders. Any system which allows some people to exercise unbridled power over others is an open invitation to abuse, whether that system is called slavery or socialism or something else.”—Thomas Sowell

  13. #238
    CC Grandmaster Desmond's Avatar
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    Svidler-Leko Legends of Chess Rd 2 Game 3 Rapid
    Analysis from lichess https://lichess.org/broadcast/chess2...day-2/5QwaAsJA

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    So what's your excuse? To run like the devil's chasing you.

    See you in another life, brotha.

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