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Hot Topic (More than 10 Replies) Hennig Schara Gambit (Read 13293 times)
Stefan Buecker
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Re: Hennig Schara Gambit
Reply #17 - 05/21/09 at 05:12:28
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The article in Kaissiber #31 gives all our improvements, yes. For a while we thought that White had a +/-, but after further improvements for Black the result was that the Schara-Hennig Gambit is sound. Kaissiber #32 had three more pages with feedback from readers. - In the USA, Kaissiber is available from Chesscafe.com. You can also get it from me, just send me a PM. Postage is free for orders of two or more issues.
  
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Re: Hennig Schara Gambit
Reply #16 - 05/21/09 at 02:58:52
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Stefan Buecker wrote on 05/12/09 at 17:37:49:
The question whether White can keep a small advantage in this complicated attack g5 b4 is no longer relevant, because White has better ways to get a +/- at an earlier stage, and Black can improve, too...


Would I be correct in assuming these improvements for both sides can be found in your article? I'll have to figure out how to get a copy of it in the US.
  
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Stefan Buecker
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Re: Hennig Schara Gambit
Reply #15 - 05/12/09 at 21:05:41
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Stefan Bücker, Maurits Wind and Michiel Wind: "Neues im Schara-Hennig-Gambit", Kaissiber #31 (2008); this 32 page article not only contains hundreds of new ideas, but also gives the only known photograph of Anton Schara, thanks to the research of Michael Ehn.
  
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MNb
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Re: Hennig Schara Gambit
Reply #14 - 05/12/09 at 20:55:15
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Stefan Buecker wrote on 05/12/09 at 17:37:49:
The details of 14...Kb8 fill a third of a page, one percent of the whole article. It is perhaps understandable that I won't repeat it here.

Not perhaps - certainly. What article are you referring to and where can I find it? Thanks.
  
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Stefan Buecker
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Re: Hennig Schara Gambit
Reply #13 - 05/12/09 at 17:37:49
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The details of 14...Kb8 fill a third of a page, one percent of the whole article. It is perhaps understandable that I won't repeat it here. I spent about four months on the article, together with my two co-authors, Maurits Wind and Michiel Wind. This main line goes 15.Rb1 (also considered: 15.Bb2 and 15.Nb5) 15...Be6 16.Qc2 Qc5 17.Bb2 Rhg8 =. On 15.a3 (not mentioned in the article) Black can play 15...Bxc3 16.Qxc3 Ne4 17.Qc4 Rhe8 18.Bb2 g4 19.Nd4 Nd2 20.Nxc6+ Bxc6 21.Qf4+ Qd6 22.Qxd6+ Rxd6 23.Rfc1 h5 =. On 13.Nd4 Samarian's 13...Qe5 is best. Yes, 14.Nf3 can lead to a draw.

Quote:
It looks like a few things have changed since Van der Tak (it was him, wasn't it?) wrote about the Von Hennig-Schara in NIC.

Van der Tak's fine article in NIC Magazine 11/1985, pp.49-53 is our source no. 24 in the bibliography (of 45 sources from 1924 to 2007). Yes, many things have changed. The question whether White can keep a small advantage in this complicated attack g5 b4 is no longer relevant, because White has better ways to get a +/- at an earlier stage, and Black can improve, too... Altogether the SHG is a correct gambit full of fascinating tactics. I warmly recommend it to Black.
  
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Re: Hennig Schara Gambit
Reply #12 - 05/12/09 at 15:46:25
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Isn't that evaluation a bit early? I suppose after 15.a3 Black can improve on 15...Bc5 with 15...Be6 but after 16.Qb2 Ba5 17.Nb5 Black's king looks still less safe than White's one.
White also can change move order with 13.Nd4 intending g4 14.b4 Bxb4 15.Qb3. Do you imply that Black should offer the draw here with 13.Nd4 Qe5 14.Nf3 Qe7 ? What about 13.Nd4 Kb8 14.b4 instead?
It looks like a few things have changed since Van der Tak (it was him, wasn't it?) wrote about the Von Hennig-Schara in NIC.
  
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Re: Hennig Schara Gambit
Reply #11 - 05/12/09 at 03:37:58
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14...Kb8 =.
  
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MNb
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Re: Hennig Schara Gambit
Reply #10 - 05/12/09 at 01:26:51
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TonyRo wrote on 05/08/09 at 20:16:11:
It is very active and difficult to play against. If you're not concerned with losing a couple of games to people that are booked up (who knows if anyone is actually booked up against this line!), then it's a go! The line I remember as being best is 5. Qxd4 Nc6 6. Qd1 exd5 7. Qxd5 Bd7 8. Nf3 Nf6 9. Qd1 Bc5 10. e3 Qe7 11. Be2 0-0-0 12. 0-0 g5 13. b4! Bxb4 14. Bb2 g4 15. Nd4 Kb8 16. Ncb5 with a mess.


This looks likes a straightforward refutation:

Portisch,L (2640) - Velimirovic,D (2515) [D32]
Interzonale Rio de Janeiro (16), 1979
1.c4 e6 2.Nc3 d5 3.d4 c5 4.cxd5 cxd4 5.Qa4+ Bd7 6.Qxd4 exd5 7.Qxd5 Nc6 8.Nf3 Nf6 9.Qd1 Bc5 10.e3 Qe7 11.Be2 g5 12.0–0 0–0–0 13.b4 Bxb4 14.Qb3 g4 15.Nd4 Nxd4 16.exd4 Be6 17.Qb2 Nd5

and now 18.Nxd5 Rxd5 19.Bc4 Rdd8 (Rh5 20.d5) 20.Bxe6 fxe6 21.Rb1 Bd6 22.Bg5 wins.

If 15...Kb8 then 16.Rb1 Rc8 17.Nxc6+ Rxc6 18.Qxb4 Qxb4 19.Rxb4 Rxc3 20.Bb2 Nd5 21.Bxc3 1-0 Fritsch-Fritz, Württemberg 1979 looks very strong.

Any ideas? Of course Black can castle kingside and hope that his activity compensates the pawn, but that's by far not as attractive.
  
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Re: Hennig Schara Gambit
Reply #9 - 05/11/09 at 01:44:55
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The Manhattan-Westphalia Variation (3.Nf3 Nf6 4.Nc3 Nbd7 5.Bg5 Bb4) does pretty well in practice. Still I have always considered this +=, but I intend to take another look.
  
The book had the effect good books usually have: it made the stupids more stupid, the intelligent more intelligent and the other thousands of readers remained unchanged.
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Stefan Buecker
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Re: Hennig Schara Gambit
Reply #8 - 05/09/09 at 03:19:52
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Markovich wrote on 05/09/09 at 00:02:08:
I'll take everyone's word that 4...cxd4 5.Nxd4 Nf6 is OK for Black, but I would probably just play 6.cxd5 Nxd5 7.Bd2 and wait and see what happens, with the idea 7...Bc5 8.Nb3 Bb6 9.g3.


7...Be7 8.e4 Nb4 9.Be3 0-0 10.Be2 N8c6 (=, 22) Quinteros - Kasparov, Moscow 1982. I looked at these attempts to avoid the Schara-Hennig Gambit for that Kaissiber article. My impression was that both (3.Nc3 c5) 4.Nf3 and 3.cxd5 exd5 4.Nc3 c6 are easier to defend than regular QG lines, a "=" seems fair in both cases.

So if White wants to avoid the Schara-Hennig, he should play 3.Nf3, when White has the usual initiative (e. g. the Ragozin Variation is +=). But then he has to know some Nf3 lines, which are not necessarily part of his 2.c4 ... 3.Nc3 repertoire.
  
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Re: Hennig Schara Gambit
Reply #7 - 05/09/09 at 00:02:08
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Well I don't think that a move that leads to = can be labelled ?!, can it?  I'll take everyone's word that 4...cxd4 5.Nxd4 Nf6 is OK for Black, but I would probably just play 6.cxd5 Nxd5 7.Bd2 and wait and see what happens, with the idea 7...Bc5 8.Nb3 Bb6 9.g3.

But White has little, it seems.  I suppose that this shows that 4.cxd5 is better than 4.Nf3, which surprises me a little.  I had thought I recalled that White had chances in that ...e5 line.
  
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Re: Hennig Schara Gambit
Reply #6 - 05/08/09 at 22:54:04
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In my database, after 6.Bg5 e5 Black scores 56% in 107 games.
  
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Re: Hennig Schara Gambit
Reply #5 - 05/08/09 at 22:10:32
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4.Nf3?! cd4: 5.Nd4: Nf6 and here 6.Bg5!? is scoring 71.4 % with an average elo of 2607 in Fritz10 database.


Btw: 6.Bg5 dc4!?: 7.e4 and here is played A)7...Bb4 and B)7...Qa5


A) 7...Bb4 and here is offered a transposition to the Ragozin defense if i'm correct with 8.Bc4: but 8.Qa4! is better and according to the Big database 2008 not yet played ?



B) 7...Qa5 and now book is 8.Bf6: gf6: 9.Bc4: a6 10.0-0 but perhaps this can be a candidate for a future Kramnik-Anand game with 10....Rg8!?
Wink
  
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Re: Hennig Schara Gambit
Reply #4 - 05/08/09 at 21:50:07
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4.Nf3?! cxd4 5.Nxd4 Nf6 =.

4.cxd5 cxd4 5. Qxd4 Nc6 6. Qd1 exd5 7. Qxd5 Bd7? 8. Nf3 Nf6 9. Qd1 Bc5 +/- 10. e3? Qe7 11. Be2 0-0-0 12. 0-0 g5 13. b4 Bxb4 is about =, but this move-order is inaccurate. - The Schara-Hennig Gambit was analyzed on 32 pages in Kaissiber 31 (2008).
  
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Re: Hennig Schara Gambit
Reply #3 - 05/08/09 at 21:13:21
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If White is concerned about this and is willing to play against a Semi-Tarrasch, he can play 4.Nf3.
  
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