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Very Hot Topic (More than 25 Replies) C33: Is the Mason gambit playable? (Read 85960 times)
SWJediknight
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Re: is the masion gambit playable?
Reply #44 - 10/25/10 at 18:08:11
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14.Qd3! (14.Nxe4?! d5 15.Qe2 dxe4 16.Qxe4 Qd6 with advantage for Black) 14...d5 (14...Bf5 15.Nxe4 d5 16.Nf6+ Bxf6 17.Qxf5 dxc4 18.0-0-0 with a continuing attack, e.g. 18...Qd6 19.Rhe1+ Kf7 20.d5 Ne7 21.Qh5+ Kf8 22.Qxg4 and the threat of Re6 encourages Black to take the perpetual following 22...Bxb2+).  15.Bxd5 (15.Nxd5?! Nxf2 -/+) 15...Nd6 16.0-0-0 and White retains attacking chances against the exposed king, e.g. 16...h5 17.Bxc6+ bxc6 18.d5 Kf7 (18...cxd5?! 19.Qg6+ Kf8 20.Nxd5 with excellent compensation) 19.dxc6, with two pawns and an attack for the piece.
  
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Re: is the masion gambit playable?
Reply #43 - 10/25/10 at 08:47:59
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But it may not matter anyway, for 12.Bc4+ doesn't look bad for White to me, e.g. 12...Ke8 13.f4,Na5


But what if Black plays 13...Nxe4 (14.Nxe4,d5) which seems to make an inroad on White's compensation....
  
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Re: is the masion gambit playable?
Reply #42 - 10/24/10 at 13:20:26
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brabo wrote on 10/20/10 at 16:33:50:
Unbelievable, only 2 hours after my post you come up with not less than 6 different improvements. However looking at the depth of the analysis, not more than 1 move, I wonder how serious this all is.
Your claim that things are unclear already confess that not enough time has been put in the reply.

Whites alternatives 13.Nd5, 13.Rf1, Rg1 and 13.Kc1 in the 11...Ke8 line can all be answered by Qd7. The idea is clever : Kd8 followed up in some cases by Qe8. Black later can bring the king completely in safety by developing the bishop from c8 and putting the king on c8. The compensation for the piece minus will be tough to prove on the long term.

13.Kc1 in the line 11...Kg7 can be answered by a6 creating counterplay on the queenside. The fact that the a1 rook is locked up, makes the situation look grim for white.

Finally your last idea 11.Bf2 in the 11...Kg7 line is interesting but too slow. After 11.Bf2 Nf6 12.Bg2 can't be the solution. The bishop is really misplaced on that square. One possible continuation from Rybka that I like, is Qg8 benefiting of no more Bc4.

1.e4 e5 2.f4 exf4 3.Nc3 Qh4+ 4.Ke2 Qe7 5.d3! Nf6 6.Bxf4 d5 7.Kd2! d4 8.Nd5 Nxd5 9.exd5 g5 10.Qh5 Qb4+ 11.Kd1 Qxb2 12.Rc1 which you give as better black, is conform Rybka equal.


I think some of the above is a bit harsh- sometimes "unclear" can be a lazy assessment but it can sometimes be difficult to do much better, and I have limited time to go through all of the variations.  There are numerous alternatives for both sides at each move.

The reason why the bishop might be better placed on f2 than on e3 is that it prevents ...Bxh4+.  After 11.Bf2 Nf6, I agree that the bishop looks misplaced on g2- after 12.Bg2 Qg8 13.Qe2 g3 14.Be3 Kg7 15.0-0-0 is given as equal by Fritz- why, I'm not sure, because that bishop on g2 is a bit of an embarrassment.

But it may not matter anyway, for 12.Bc4+ doesn't look bad for White to me, e.g. 12...Ke8 13.f4 (13.Nd5 Na5! leaves Black better, e.g. 14.Bd3 Nxd5 15.exd5 c6 16.dxc6 Qb6+) 13...Na5 14.Be2 Rg8 15.Qd3 with good compensation, e.g. 15...d5 16.e5 Ne4 (16...Nd7? 17.Qh7!) 17.Nxe4 dxe4 18.Qxe4, or simply 16...Nc6 17.0-0-0.

Or 12...Kg7 13.Qd2 Rf8 14.Be3 (the bishop now belongs on this square as there is no ...Bxh4+ threat) 14...Ng8 15.0-0-0, for 15...Rxf3 is risky on account of 16.Rdf1 (e.g. 16...Rxf1+ 17.Rxf1 Bf6 and White has a powerful attack for the piece).  I think at the very least White is very close to full compensation following 11.Bf2 and 12.Bc4+.
  
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Re: is the masion gambit playable?
Reply #41 - 10/22/10 at 09:59:43
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MNb wrote on 10/22/10 at 00:03:34:
When playing a corr. game or investigating an opening seriously I work methodically as well. Knowing my limitations I take a lot more time for checking and rechecking than I do now.
This thread is just a silly pastime for me. Later (and that might take more than a year) I will look systematically at this. That includes the questions if White has to play 9.Bc4+ at once and if Black has better than 9...d5 in that case..

I've played 6 years correspondence but gave it up in 2004 because to play on the level that I wanted (my careerrecord ended at + 16, = 4, -0 with several victories against + 2400 players) , requests full dedication and I concluded that I was missing too many other things due to correspondence. Correspondence was also damaging my OTB chess. Only after I stopped or at the end when few work was needed in the remaining cc games, I was able to prepare properly for OTB and develop my general understanding of chess. This forum is a relaxed form for me to do some analytical work without the need to have it perfect from the first time as is needed in correspondence and without the pressure of having to reply within a certain timeframe. Also a strong point of this forum compared with correspondence is the interaction. Maybe you have different experiences but I never had any sharing of ideas and analysis with opponents after a game. In general my enthousiasm has cooled down with correspondence.

Concering Bc4+. Personally I think white should wait with it so blacks king stays on the weak f7 spot. However I doubt this can be done successfully without creating other disadvantages.
  
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Re: is the masion gambit playable?
Reply #40 - 10/22/10 at 00:03:34
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Good work, my compliment.
brabo wrote on 10/21/10 at 21:07:31:
Contrary to you, I work very methodically.
Important modification: contrary to me in this thread. When playing a corr. game or investigating an opening seriously I work methodically as well. Knowing my limitations I take a lot more time for checking and rechecking than I do now.
This thread is just a silly pastime for me. Later (and that might take more than a year) I will look systematically at this. That includes the questions if White has to play 9.Bc4+ at once and if Black has better than 9...d5 in that case.

brabo wrote on 10/21/10 at 21:07:31:
The game Babula-Votruba, Cihak 1969 is starting with 8.Bc4+ which isnt' the same as what we are discussing here. Pollock-Gossip, Montreal 1894 concerns a completely different opening so not sure why you bring that game up.
Well, I noted that in some lines you do follow up with d6-d5 later. So I thought it might be handy to compare the two lines to get ideas and to check if there are transpositions. When I have time and when I feel like I will do it myself.

brabo wrote on 10/21/10 at 21:07:31:
Gallagher-Hresc, Geneve 1991 also has no direct link to my analysis because I don't sacrifice with d5.
It has no link. I just liked to mention which line troubled (past tense; it has been quite a while ago when I went over the Hamppe-Allgaier) me most. That might come in handy when in the end you appear not satisfied with the ...d6 and ...Be7 idea after all.
Just trying to be helpful; sorry for mentioning if it is not appreciated. You're welcome if it is.
Alas I have other, more serious things to do. Thanks for providing me with some fun.
  
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Re: is the masion gambit playable?
Reply #39 - 10/21/10 at 21:07:31
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MNb wrote on 10/20/10 at 00:17:58:
At the other hand - why not resist the temptation of that check on c4 once again? 11.Kd2 and only after Bxh4 12.Bc4+ and 13.Qg1.

1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 f3! 9.gxf3 Be7 10.Be3 d6 11.Kd2 Nf6 of course and you tell me if white has something else than returning to my earlier mentioned variations with Bc4+.

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1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 f3! 9.gxf3 Be7 10.Be3 d6 11.Bc4+ Kg7 I propose 12.Qe2 and only after Bxh4+ (which you want to avoid) 13.Kd2. After eg Bf6 14.Qf2 Na5 15.Bd3 c5 16.Nd5 cxd4 17.Bf4 White completes his/her development by directing all pieces to the King's Wing. 16...Bxd4 17.Bxd4 cxd4 18.Raf1 shows the same idea.

1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 f3! 9.gxf3 Be7 10.Be3 d6 11.Bc4+ Kg7 12.Qe2 Bxh4+ (Here it is ok because white would otherwise get too easy 0-0-0 and white also doesn't have the often very annoying Qg1 here) 13. Kd2 Bf6 14.Qf2 Na5 15. Bd3 c5 16.Nd5 cxd4 (Probably the best although I doubt that white can equalise either after Bxd4. Black is afterall a piece up which is a lot.) 17.Bf4 Nc6 (Using the free black squares) 18. Raf1 Ne5 19.fxg4 Be6 20.Kc1 Nxd3+ 21.cxd3 Bxd5 22.exd5 and after these massive exchanges blacks extra piece is likely to be decisive.)

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1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 f3! 9.gxf3 Be7 10.Be3 d6 11.Bc4+ Ke8 The same here. White does not need to play Kd2 voluntarily. I'd prefer 12.f4 Bxh4+ 13.Kd2 Bf6 14.Qg1 Nge7 15.Re1. After 12...Na5 13.Bd3 c5 Rybka suggests 14.Bf2 (after other moves ...Bxh4+ seems annoying). The idea is to complete development by castling queenside and prepare a central break. Then Black's King will be unsafe.

1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 f3! 9.gxf3 Be7 10.Be3 d6 11.Bc4+ Ke8 12.f4!? (Interesting but a bit slow and it also closes at least temporarily the f and g files which are often necessary for finding the compensation) Bxh4+ (Probably the best now that the Qg1 idea isn't so menacing anymore) 13.Kd2 Bf6 14.Qg1 Na5 (There are other ideas e.g. with Nge7 but I prefer this idea because now black gets nice counterplay) 15.Bd3 c5! (A strong pawnsacrifice to put whites king in open air too. Black can permit it. He is afterall having a piece more.) 16.dxc5 dxc5 17.Bxc5 b6 18.Bf2 Bxc3 19.bxc3 and whites e and f pawns are looking thin as compensation for the piece.

Quote:
Anyhow, I recommend to play through the game Babula-Votruba, Cihak 1969. White had fair chances, even though Black had more or less won a tempo via 9.Bc4+ d5 10.Bxd5. There is also the golden oldie Pollock-Gossip, Montreal 1894, where White can improve with 16.Be4.

To be honest, it was the game Gallagher-Hresc, Geneve 1991 that troubled me most.

Contrary to you, I work very methodically. Not only I review all reference games of the latest megabase but I also take a look at the latest downloads from twic, the megacorrespondence database and finally the latest downloads from iccf. I can tell you that I found 6 games with the f3 idea of which none was of much theoretical importance. In fact the whole variation is still in a very early theoretical stadium. The game Babula-Votruba, Cihak 1969 is starting with 8.Bc4+ which isnt' the same as what we are discussing here. Pollock-Gossip, Montreal 1894 concerns a completely different opening so not sure why you bring that game up unless in my database the game is wrongly published. Gallagher-Hresc, Geneve 1991 also has no direct link to my analysis because I don't sacrifice with d5.
  
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Re: is the masion gambit playable?
Reply #38 - 10/20/10 at 16:33:50
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SWJediknight wrote on 10/19/10 at 22:48:11:
I note with interest that when I feed that line into Fritz up to 10...d6 it only gives Black as up by 0.4-0.5 of a pawn.  I've looked at those lines and both of them have a strong air of "unclear" about them- even if Black is better with best play, it's going to be tough to prove.

Especially as White has alternatives- in the 11...Ke8 line White has 13.Nd5, 13.Rf1, 13.Rg1 and 13.Kc1, while in the 11...Kg7 line White can also consider 13.Kc1.  White can also consider 11.Bf2!? (this is also an alternative to Kd2 at move 12 in the Bc4+ lines, but if White is to defend the h4-pawn in this way it makes more sense to do so immediately, keeping more options open). 

Fritz 10's big idea after 11.Bf2 is to meet 11...Nf6 with 12.Bg2, followed by Qd2, 0-0-0 and f4 with long-term attacking chances.  This 8...f3 line strikes me as much more "open-ended" than the lines considered previously, but that means it's going to be even harder to reach any definite conclusions. 

I still see nothing here to make me prefer this for Black to 3...Qh4+ 4.Ke2 and one of Black's alternatives to 4...d5.  I've discussed 4...Qe7 (which I still consider best) and other areas to explore include 4...d6 5.Nf3 Qe7 (5...Bg4 6.Nd5) 6.Kf2 c6 followed by 7...g5, and 4...c6 (or 4...Ne7) 5.Nf3 Qh5 6.d4 g5.  All lead to interesting complications, but also chances of advantage for Black.

Unbelievable, only 2 hours after my post you come up with not less than 6 different improvements. However looking at the depth of the analysis, not more than 1 move, I wonder how serious this all is.
Your claim that things are unclear already confess that not enough time has been put in the reply.

Whites alternatives 13.Nd5, 13.Rf1, Rg1 and 13.Kc1 in the 11...Ke8 line can all be answered by Qd7. The idea is clever : Kd8 followed up in some cases by Qe8. Black later can bring the king completely in safety by developing the bishop from c8 and putting the king on c8. The compensation for the piece minus will be tough to prove on the long term.

13.Kc1 in the line 11...Kg7 can be answered by a6 creating counterplay on the queenside. The fact that the a1 rook is locked up, makes the situation look grim for white.

Finally your last idea 11.Bf2 in the 11...Kg7 line is interesting but too slow. After 11.Bf2 Nf6 12.Bg2 can't be the solution. The bishop is really misplaced on that square. One possible continuation from Rybka that I like, is Qg8 benefiting of no more Bc4.

1.e4 e5 2.f4 exf4 3.Nc3 Qh4+ 4.Ke2 Qe7 5.d3! Nf6 6.Bxf4 d5 7.Kd2! d4 8.Nd5 Nxd5 9.exd5 g5 10.Qh5 Qb4+ 11.Kd1 Qxb2 12.Rc1 which you give as better black, is conform Rybka equal.
  
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Re: is the masion gambit playable?
Reply #37 - 10/20/10 at 00:17:58
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brabo wrote on 10/19/10 at 20:21:29:
1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 f3! 9.gxf3 Be7 10.Be3 d6 11.Bc4+
It's interesting that you postpone the check Bc4+ in order to avoid the immediate counterblow d7-d5. I do not like 11.Bf2 very much - why should that bishop be better on f2 than on e3? At the other hand - why not resist the temptation of that check on c4 once again? 11.Kd2 and only after Bxh4 12.Bc4+ and 13.Qg1.

brabo wrote on 10/19/10 at 20:21:29:
A) 11...Kg7 12.Kd2 Nf6 13.Qg1 d5! 14.Bxd5 Bb4 15.Bxc6 bxc6 16.a3 Bxc3 17.bxc3 and i've doubts about whites compensation.

This time I don't like JediKnight's suggestion 13.Kc1 - how is Ra1 going to get into play? I propose 12.Qe2 and only after Bxh4+ (which you want to avoid) 13.Kd2. After eg Bf6 14.Qf2 Na5 15.Bd3 c5 16.Nd5 cxd4 17.Bf4 White completes his/her development by directing all pieces to the King's Wing. 16...Bxd4 17.Bxd4 cxd4 18.Raf1 shows the same idea.

brabo wrote on 10/19/10 at 20:21:29:
B) 11...Ke8 12.Kd2 Nf6 13.Qe2 Na5!? 14.Bd3 and again I've doubts about whites compensation.
The same here. White does not need to play Kd2 voluntarily. I'd prefer 12.f4 Bxh4+ 13.Kd2 Bf6 14.Qg1 Nge7 15.Re1. After 12...Na5 13.Bd3 c5 Rybka suggests 14.Bf2 (after other moves ...Bxh4+ seems annoying). The idea is to complete development by castling queenside and prepare a central break. Then Black's King will be unsafe.

Anyhow, I recommend to play through the game Babula-Votruba, Cihak 1969. White had fair chances, even though Black had more or less won a tempo via 9.Bc4+ d5 10.Bxd5. There is also the golden oldie Pollock-Gossip, Montreal 1894, where White can improve with 16.Be4.

To be honest, it was the game Gallagher-Hresc, Geneve 1991 that troubled me most.
  
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Re: is the masion gambit playable?
Reply #36 - 10/19/10 at 22:48:11
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I note with interest that when I feed that line into Fritz up to 10...d6 it only gives Black as up by 0.4-0.5 of a pawn.  I've looked at those lines and both of them have a strong air of "unclear" about them- even if Black is better with best play, it's going to be tough to prove.

Especially as White has alternatives- in the 11...Ke8 line White has 13.Nd5, 13.Rf1, 13.Rg1 and 13.Kc1, while in the 11...Kg7 line White can also consider 13.Kc1.  White can also consider 11.Bf2!? (this is also an alternative to Kd2 at move 12 in the Bc4+ lines, but if White is to defend the h4-pawn in this way it makes more sense to do so immediately, keeping more options open). 

Fritz 10's big idea after 11.Bf2 is to meet 11...Nf6 with 12.Bg2, followed by Qd2, 0-0-0 and f4 with long-term attacking chances.  This 8...f3 line strikes me as much more "open-ended" than the lines considered previously, but that means it's going to be even harder to reach any definite conclusions. 

I still see nothing here to make me prefer this for Black to 3...Qh4+ 4.Ke2 and one of Black's alternatives to 4...d5.  I've discussed 4...Qe7 (which I still consider best) and other areas to explore include 4...d6 5.Nf3 Qe7 (5...Bg4 6.Nd5) 6.Kf2 c6 followed by 7...g5, and 4...c6 (or 4...Ne7) 5.Nf3 Qh5 6.d4 g5.  All lead to interesting complications, but also chances of advantage for Black.
  
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Re: is the masion gambit playable?
Reply #35 - 10/19/10 at 20:21:29
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1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 Nf6 9.Bxf4 Bb4 10.Bd3 d6 11.0-0! and I must admit that I can't find a way to keep the advantage for black.

So I switched my attention to my second best variation to search for a black advantage which I believe now after few days of extra analysis is the most critical test for white.

1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 f3! (I've seen this move mentioned in some old thread without any further analysis) 9.gxf3 Be7 10.Be3 d6 (A new idea although I must admit that the whole variation is extremely rare. Here I think black should restrict himself of taking on h4 too soon.) 11.Bc4+ and now black has

A) 11...Kg7 12.Kd2 Nf6 13.Qg1 d5! 14.Bxd5 Bb4 15.Bxc6 bxc6 16.a3 Bxc3 17.bxc3 and i've doubts about whites compensation

B) 11...Ke8 12.Kd2 Nf6 13.Qe2 Na5!? 14.Bd3 and again I've doubts about whites compensation.
  
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Re: is the masion gambit playable?
Reply #34 - 10/16/10 at 21:07:12
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MNb wrote on 10/16/10 at 19:56:53:
1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 Nf6 9.Bc4+ d5 10.Nxd5 f3 11.gxf3 Kg7 12.Be3 Na5 13.Nxf6 Nxc4 14.Nh5+ Kh7 15.Qe2 Bb4+ 16.c3 Nxe3 17.Qxe3 Rf8!
18.f4 is unclear.

I don't agree:
1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 Nf6 9.Bc4+ d5 10.Nxd5 f3 11.gxf3 Kg7 12.Be3 Na5 13.Nxf6 Nxc4 14.Nh5+ Kh7 15.Qe2 Bb4+ 16.c3 Nxe3 17.Qxe3 Rf8! 18.f4 Bd6 19.Rf1 Be7 20.0-0-0 Qe8 21.Ng3 Bxh4 22.Rde1 Qg6 23.Kb1 Bd7 and black has a big advantage thanks to his extra piece.
  
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Re: is the masion gambit playable?
Reply #33 - 10/16/10 at 19:56:53
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brabo wrote on 10/16/10 at 17:27:54:
Why do you go forward with Kg6?

Because I am a poor and unsystematical analyst.

1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 Nf6 9.Bc4+ d5 10.Nxd5 f3 11.gxf3 Kg7 12.Be3 Na5 13.Nxf6 Nxc4 14.Nh5+ Kh7 15.Qe2 Bb4+ 16.c3 Nxe3 17.Qxe3 Rf8!
brabo wrote on 10/16/10 at 17:27:54:
Another example that blacks strategy should be not keeping the extra piece at any cost but always be ready to sacrifice it back.

Passive (counter)sacs don't have to be accepted. 18.f4 is unclear.
  
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Re: is the masion gambit playable?
Reply #32 - 10/16/10 at 18:52:01
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It's because Brabo considers 3...Nc6 to be the most critical reply.

I am happy to defend those lines myself as Black, having played the black side of 3.Nf3 Nc6 4.d4 g5 5.h4 g4 6.Ng5!? (6.Ne5 is safer) 6...h6 7.Nxf7 Kxf7 which soon transposed after a quick Nc3.  But from these discussions it seems clear to me that if Black is to prove a clear-cut edge against the Hamppe-Allgaier it is going to require deep computer analysis and rebuttals against several possible White alternatives around moves 10-13.  Black has nothing better than to go in for those lines after 1.e4 e5 2.f4 exf4 3.Nc3 Nc6, or 3.Nf3 Nc6 4.Nc3, or 2.Nc3 Nc6 3.f4- but I'm still having a hard time believing that this is true of 1.e4 e5 2.f4 exf4 3.Nc3, at least outside of the highest levels of correspondence play.

If faced with 1.e4 e5 2.f4 exf4 3.Nc3, particularly if it was a serious game, I would almost certainly opt for 3...Qh4+ and I still like 4.Ke2 Qe7 for Black (there are also alternatives that haven't been discussed yet; 4...d6, 4...c6 and 4...Nge7 are all worth a look). 

We also need to bear in mind that after 3...Qh4+ 4.Ke2 Black has a wide choice and only needs to learn one line, at least four of which offer chances of an advantage, whereas after 3...Nc6 White also has the Steinitz Gambit (4.d4) and the Pierce Gambit (4.Nf3 g5 5.d4).  I think the latter in particular is probably unsound, but you need to know your stuff as Black in either line to have much chance of emerging with advantage against accurate play.  I have a sneaking suspicion that proving an advantage against 3...Nc6 4.d4 will probably prove to be no easier than after 3...Qh4+ 4.Ke2- and that's before we get around to considering the Hamppe-Allgaier approach discussed at length in this thread.
  
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TalJechin
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Re: is the masion gambit playable?
Reply #31 - 10/16/10 at 17:46:17
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Typical chesspub, instead of discussing the "masion gambit" in the title, it's the Hamppe Allgaier in most replies - no wonder it's hard to find the correct threads later...
  
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brabo
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Re: is the masion gambit playable?
Reply #30 - 10/16/10 at 17:27:54
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MNb wrote on 10/16/10 at 14:20:24:
]
1.e4 e5 2.f4 exf4 3.Nc3 Nc6 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4 Nf6 9.Bc4+ d5 10.Nxd5 f3 11.gxf3 Kg7 12.Be3 Na5 13.Nxf6 Nxc4 14.Nh5+ Kg6 15.Nf4+ and White still has chances. It doesn't matter so much thatpieces are exchanged. What matters is which pieces are exchanged. In this case it's all Black's active ones.

Why do you go forward with Kg6? It is a middlegame not an endgame unless you want to prove via selecting bad moves for black that you are right. 14...Kh7 15.Qe2 Bb4+ 16.c3 Nxe3 17.Qxe3 Rf8! Another example that blacks strategy should be not keeping the extra piece at any cost but always be ready to sacrifice it back.
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I still have to see any crushing attack against White's King in the Hamppe-Allgaier. This factor is one of White's minor worries.
Black doesn't need any crushing attack with a piece up. Only thing black needs, is 1 disturbing check e.g. on h4 or g3 which makes an end to whites initiative. If black succeeds in that (and here contrary to the Cochrane gambit such annoying check can happen) the game is on the long run, lost for white.
  
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