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Normal Topic Hedgehog, endgame line, possible rook sac? (Read 3177 times)
gillbod
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Re: Hedgehog, endgame line, possible rook sac?
Reply #5 - 05/06/19 at 08:02:41
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Looks sound to me. Indeed, it’s equal, but black needs to find a couple of good moves OTB. Thanks for sharing!
  
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GMTonyKosten
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Re: Hedgehog, endgame line, possible rook sac?
Reply #4 - 05/05/19 at 08:51:22
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MartinC wrote on 05/05/19 at 07:42:06:
White must have quite good practical winning chances here if playing a human?

At first I was thinking this might be the case, but maybe too many of the lines lead to draws? I might be tempted to try this line against a strong player one day, just to see.
  
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MartinC
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Re: Hedgehog, endgame line, possible rook sac?
Reply #3 - 05/05/19 at 07:42:06
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White must have quite good practical winning chances here if playing a human? This really does look horribly impractical for black given that white is playing with a draw in hand.
  
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GMTonyKosten
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Re: Hedgehog, endgame line, possible rook sac?
Reply #2 - 05/04/19 at 15:47:41
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In this GMTonyKosten wrote on 05/04/19 at 15:40:22:
20...Kd8 is possible, 21 Bxf7 Qc6 22 Rd1

Actually, in this line maybe 21 Rd1 is stronger, 21...e5 22 Bxf7 Kc7 23 Bd5! Kb8 24 Rd3 with an ongoing attack.
  
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GMTonyKosten
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Re: Hedgehog, endgame line, possible rook sac?
Reply #1 - 05/04/19 at 15:40:22
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The critical move looks to me like 19...Bd4, aiming to play ...e5 and block the e-file, or ...Bc5 to block the a3-f8 diagonal:

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20 Bh5, threatening to take on e6 once again, 20...Nc5 21 Rd1 e5 22 Rxd4 (22 Qf6 draws immediately after 22...0-0 23 Qg5+) 22...exd4 23 Qf6 but again it's only a draw after 23...0-0 24 Qg5+.
20...Kd8 is possible, 21 Bxf7 Qc6 22 Rd1, but now Black has to find the saving move 22...Qf3! as 23 Rxd4 Qxf7 24 Qh4+ Ke8 25 Qe4 is again 0-00 according to my computer, although White is a rook down!
So, maybe 18 Qh6 is also drawn, without many (or any?) real winning chances for White?!
  
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GMTonyKosten
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Hedgehog, endgame line, possible rook sac?
05/04/19 at 15:17:45
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Following on from my posts on the the 18 Ne4!? drawing line, https://www.chesspub.com/cgi-bin/chess/YaBB.pl?num=1505234835, after the moves 1 c4 c5 2 Nf3 Nf6 3 g3 b6 4 Bg2 Bb7 5 O-O e6 6 Nc3 Be7 7 d4 cxd4 8. Qxd4 d6 9 Rd1 a6 10 b3 Nbd7 11 e4 Qc8! 12 Ba3 Nc5 13 e5 Bxf3 14 Bxf3 dxe5 15 Qxe5!? Ncd7 16 Rxd7! Nxd7 17 Qxg7 Bf6 I started wondering whether the move 18 Qh6 is really so bad? Now, 18...Bxc3 19 Rc1 leaves White a rook down but the black king is stuck in the centre and all the black major pieces are passively placed:

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Black has a choice of 3 bishop moves, firstly 19...Bf6 when 20 c5! (rather than 20 Rd1?! Be7! Villamayor,B (2280)-Wojtkiewicz,A (2565) Greenhills 1997 0-1 (33), the only game featuring 18 Qh6) forces 20...bxc5 21 Rxc5! with 21...Nxc5 22 Qxf6 Rg8 23 Qe5 but this just seems to be drawn, e.g. 23...Nd7 24 Qd6 Kd8 25 Qe7+ Kc7 26 Qd6+ etc. 21...Qd8 is also feasible, 22 Bxa8 Qxa8 23 Rc7 with enough compensation for the piece, but no more - my computer says: 0.00.
19...Be5 just encourages 20 Re1, bringing the rook into the attack on the e-file, 20...Rb8 21 Bh5 (with a very nasty threat!) 21...Qc6 (to defend e6) when White can either continue the attack with, say, 22 Re3, or force an immediate draw with 22 Bxf7+ Kxf7 23 Qh5+ Kg8 24 Rxe5! Nxe5 25 Qxe5:

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Black must be a bit careful, as 25...Rb7?, say, loses to 26 Bb2, but 25...Rd8 is fine, 26 Qg5+ Kf7 27 Qh5+ with a perpetual.
  
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