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Beat the Spam: Nh3

is there anything wrong with just 4. Bb4 in this line?

yeah I don't think the line in question holds water. Has 4. d5 5. Nb5 Bg4 6.f3 Nb4 been thoroughly refuted?

In that line I took this game as a reference:
lichess.org/s8VShHJJ/black#29
On 15th black move it is pretty clear that 16. Ng6 is a crushing threat, while after 15... g6 16. Ba5+! SF gives mate in 12, so not much to say there. Then we could search for improvements for black.
14... Kd8 was totally forced because of Bb4 threat
Instead of 13... Bb5 there are two moves that don't lead to quick mate: 13... Ba4, which seems pretty similar to main line after 14. Bd2, and 13... Bxe6 14. Kd2 following 15. Rc1 which is just bad. So I think it is lost anyway.
12... Bd7 can be replaced by 12... e6 13. O-O, but black's position is so cramped the will have to give up material. Stockfish claims 13... Ne7 14. Bxf6 Bf5 is the best way to do this, but after 15. b4 black cannot activate the second bishop properly, and I think white will slowly crush black here using extra man. This line should be studied deeper probably, but I don't particularly feel black has theoretical chances to hold this.
9... Rc8, 10... axb5 & 11... Rxc7 were all forced.
8... a6 has the only reasonable alternative 8... b5, leading to a long forced variation 9. Rc1 Rc8 10. Rc7 Rxc7 11. e5 e6 12. Bd3, and for me it is not hard to convince myself that black is doomed here because they lose a pawn after Ne7 Bxf6 at some move and just have bad position. (Notably, 12... Bd6 should be replied by the cold 13. exd6.)
Finally, instead of 7... Nxc2 engine only sees you can transpose into main line by 7... a6 8. e4 Nxc2, and all other moves are much worse.

All in all, I think this line depends on the outcome of 1. Nh3 h6 2. d4 Na6 3. Bg5 f6 4. Nc3 d5 5. Nb5 Bg4 6.f3 Nb4 7. Nxc7 Nxc2 8. e4 a6 9. Rc1 Rc8 10. Bb5+ axb5 11. Rc7 Rxc7 12. e5 e6 13. O-O Ne7 14. Bxf6, I think I'll look into this in a separate study as this is not obvious what is going on in this endgame.

looks like 14. Bf5 is not without chances for black. 10.Bb5+ is not forced for white also though.

1. Nh3 h6 2. d4 Na6 3. Bg5 f6 4. Nc3 Nb4 5. Nd5 e5 6. Nxc7 Nxc2 7. a3 Rc8 8. Rc1 hxg5 9. Rc7 Rxc7 10. e4 Bc5 11. dxc5 Ne7 12. Kd2 O-O 14. Bb5 a6

I have no idea of what the proper format of this thread is, but I will just post thoughts I have on these lines.

1. Nh3 h6 2. d4 Na6 3. Bg5 f6 4. Nc3 d5 5. Nb5 Bg4 6.f3 Nb4 7. Nxc7 Nxc2 8. e4 a6 9. Rc1 Rc8 10. Bb5+ I do not know about. I do not consider this to be best move of for white however.

1. Nh3 h6 2. d4 Na6 3. Bg5 f6 4. Nc3 d5 5. Nb5 Bg4 6. f3 Nb4 7. Nxc7 Nxc2 8. e4 a6 9. Rc1 Rc8 10. Rc7 Rxc7 11. e5 e6 12. b4 is a win I think by almost force unless I am miss some idea of pawnitization, which is unlikely in such positions, because for certain black is a pawn down in these lines after ideas like 12... Bd6 13. Bd3 Bc7 (13... g6 14. exd6 Bxh3 (14... e5 15. dxe5 Ne7 16. Bxf6) 15. Kd2 hxg5 16. Rc1 Ne7 17. Rc7) 14. Bh7 fxe5 15. Be7 g6 16. g3 For certain black has some tricks of these lines, but not I have seen any that work at all in of theory. So long as white does not play an absolutely terrible blunder, he should win.

1. Nh3 h6 2. d4 Na6 3. Bg5 f6 4. Nc3 Nb4 5. Nb5 e5 6. Nxc7 Nxc2 7. Bd2 Rc8 8. Bb4 Bc5 (8... Bxb4 9. Rc1 Rc2 10. Rxc2 Ne7 11. e4 O-O 12. Bb5 Nc6 (12... Ng6 13. Kd2) 13. O-O Nb5 14. Rc1 Nc2 15. f4! {Maybe here there still is something, but it does not look as such to me}) 9. Rc1 Ne7 10. g3! and here not I do think black has enough good ideas to justify the loss of the bishop. I have not seen this line played very much however, so not I am such experienced at these positions. 5. Nd5 e5 6. Nxc7 Nxc2 7. a3 Rc8 8. Rc1 hxg5 9. Rc7 Rxc7 10. e4 Bc5 11. dxc5 Nh6 (11... Ne7 12. Bb5 O-O 13. Bxd7)12. Bb5 O-O 13. Kd2 also does look quite good of for white.

1. Nh3 h6 2. d4 Na6 3. Bg5 Nf6 4. Nc3 Nb4 5. Na4! Is also listed of in this discussion and is correct I think.

1. Nh3 h6 2. d4 d5 3. Nc3 b5 4. Ne4 Bg4 5. f3 Bxf3 6. g3 e6 7. Bg2 I think is not so bad for black after 7... f5 or maybe 7... Bb4+ 8. c3 f5 even. Maybe there is even 7... g6. I do not have such much experience of this opening though.

I respectfully disagree with one of the lines put forward in #29.

After 1. Nh3 h6 2. d4 Na6 3. Bg5 f6 4. Nc3 Nb4 5. Nb5 e5 6. Nxc7 Nxc2 7. a3 Rc8 8. Rc1 hxg5 9. Rc7 Rxc7 10. e4 Bc5 11. dxc5 there is no need for black to play either 11.. Nh6 or 11.. Ne7. Engine suggests 11.. b5, but let's try 11.. a6.

After 1. Nh3 h6 2. d4 Na6 3. Bg5 f6 4. Nc3 Nb4 5. Nb5 e5 6. Nxc7 Nxc2 7. a3 Rc8 8. Rc1 hxg5 9. Rc7 Rxc7 10. e4 Bc5 11. dxc5 a6 12. Bc4 d5 13. Kd2 Ne7 14. Rc1 O-O 15. Bb3 Rc8 16. Rc7 Rxc7 if white takes the d5 pawn with pawn 17. exd5, then the position is pawnitized, if white takes it with the bishop 17. Bxd5, then black's plan is to trade down the queen side pawns and then claim that white's pawn advantage on the king side can be reduced to K + P vs K draw. Of course there is no need to take the pawn, white can play on with 17. f4 etc., but the idea is still to reduce the position to some drawn ending. I'm not saying that black can actually do this, but to prove the contrary is not trivial.

Reconnecting