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Up Topic The Rybka Lounge / Test Positions / Rhf1 is pretty good...
- - By user923005 (****) [us] Date 2018-02-02 19:15
But Nxe6 is a lot better and more fun too.
1rb1k1r1/1pqnbpp1/p2ppn1p/8/3NPP1B/2N3Q1/PPP1B1PP/2KR3R w - - acd 36; acs 587; bm Nxe6; cce 123; ce 275;
pm Rhf1 {38} Rhe1 {5} Nf3 {4} Bxf6 {2} e5 {2} f5 {2} Bf3 {1}; pv Nxe6 fxe6 Qg6+ Kf8 Rhf1 Qd8 e5 Qe8 Qg3 b5 exf6 gxf6 Qe3 f5 Qxe6 Nf6 Qb3 Qf7 Bxf6 Bxf6 Nd5 Be6 Bf3 Kg7 Qe3 Bxd5 Bxd5 Rge8 Qh3 Qf8 Kb1 Kh8 Qxf5 Bg7 Qxf8+ Rxf8 g3 Rfd8 Bf3 b4 Rd5 Rb5 Rxb5 axb5 Be2 Kg8 Bxb5 d5 g4 Kf7 Re1 Bf6; white_wins 33; black_wins 18; draws 3;
Parent - - By ChrisW (**) Date 2018-03-03 09:23
looks like something out of Fischer's 60, Sicilians, analysed in depth by him back in 70's. Presumably not though.
Parent - - By Eelco de Groot (***) Date 2018-03-15 18:19
With the Lookup function under the board, we can see that as recently as 2008, Black did go into this still but apparently nobody found Dann's move, either at home or over the board. After 2008 no more games so presumably somebody found and posted it in a book. Could well be John Nunn? But the move was never played at least not in a GM game according to this database! Computer finds it instanly now...

Kaissa thinks:


1rb1k1r1/1pqnbpp1/p2ppn1p/8/3NPP1B/2N3Q1/PPP1B1PP/2KR3R w - -


Engine: Kaissa III (512 MB)
by T. Romstad, M. Costalba, J. Kiiski, G.

17/31  0:01   +2.78    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 b5 6.exf6 Nxf6 7.Bd3 Nh5
                       8.Qh3 Bxh4 9.Qxh4 g6 10.Be2 Qe7
                       11.Qh3 d5 12.Bxh5 gxh5 (2.646.075) 1795

18/32  0:01   +2.82    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 Nc5 6.exf6 gxf6 7.Qh3 Qf7
                       8.f5 b5 9.Qe3 b4 10.fxe6 Bxe6 11.Ne4 Nxe4
                       12.Qxe4 (3.282.303) 1792

19/30  0:02   +2.74    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 b5 6.exf6 gxf6 7.Qh3 Qf7
                       8.f5 Nc5 9.fxe6 Bxe6 10.Qe3 (3.804.658) 1787

20/37  0:03   +2.93    1.Nxe6 fxe6 2.Qg6+ Kd8 3.e5 b5
                       4.Rhf1 Rb6 5.Qf7 Re8 6.exf6 Nxf6
                       7.Bf3 g5 8.fxg5 hxg5 9.Bg3 Rf8
                       10.Qg6 Rg8 11.Qd3 Bd7 12.Qd4 (5.790.523) 1796

21/34  0:03   +3.01++  1.Nxe6 (6.862.947) 1804

21/39  0:04   +2.86--  1.Nxe6 fxe6 (8.504.149) 1818

21/39  0:04   +2.75--  1.Nxe6 fxe6 (8.662.475) 1817

21/39  0:04   +2.65    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 b5 6.exf6 gxf6 7.Qe3 f5
                       8.Qh3 Nc5 9.Bxe7+ Qxe7 10.Qh5 Bb7 (9.015.068) 1817
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34/54  44:56  +3.31    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 Qf7 6.Kb1 b5 7.Bd3 b4
                       8.Bg6 Nh5 9.Qd3 Nc5 10.Qd4 Qxg6
                       11.Bxe7+ Kf7 12.Bxd6 Rb7 13.Ne2 b3
                       14.Qxc5 (5.352.929.321) 1985

35/56  55:43  +3.39++  1.Nxe6 (6.675.955.749) 1996

35/56  61:03  +3.46++  1.Nxe6 (7.326.696.671) 1999

35/56  67:50  +3.24--  1.Nxe6 fxe6 (8.161.362.220) 2005

35/56  70:51  +3.27    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 Qf7 6.Kb1 b5 7.Bd3 b4
                       8.Bg6 Nh5 9.Qd3 Nc5 10.Qd4 Qxg6
                       11.Bxe7+ Kf7 12.Bxd6 Rb7 13.Ne2 b3
                       14.Qxc5 (8.529.509.697) 2006

36/54  85:00  +3.35++  1.Nxe6 (10.282.940.277) 2016

36/54  102:06 +3.42++  1.Nxe6 (12.525.055.290) 2044

36/54  137:23 +3.53    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 b5 6.Bd3 b4 7.Bg6 Nh5
                       8.Qd3 Nc5 9.Qd4 Qxg6 10.Bxe7+ Kf7
                       11.Bxd6 Rb7 12.Nd5 Qe4 13.Qxc5 exd5
                       14.f5 (16.963.319.680) 2057

37/54  137:35 +3.53    1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8
                       4.e5 Qe8 5.Qg3 b5 6.Bd3 b4 7.Bg6 Nh5
                       8.Qd3 Nc5 9.Qd4 Qxg6 10.Bxe7+ Kf7
                       11.Bxd6 Rb7 12.Nd5 Qe4 13.Qxc5 exd5
                       14.f5 {
2b3r1/1r3kp1/p2B3p/2QpPP1n/1p2q3/8/PPP3PP/2KR1R2 b - -
}(16.986.794.492) 2057

best move: Nd4xe6 time: 137:35.296 min  n/s: 2.057.695  nodes: 16.986.794.492

The position is with alternate coloured bishops and Black has a material advantage, still White wins it. I think Fischer could have found it on the board!
Parent - - By ChrisW (**) Date 2018-03-15 19:31
the position is more or less gagging for it, as they say. from what I remember of these positions from 1970's, Fischer considered Ae5 to be key. If black could ever get Ne5, then white sttack was over. from that, white has to avoid f5. e5 as a "blocking" play is ok,, especially with a Rf1 inhibiting dxe5. just as long as the defensive knight can't get there white has good advantage for the piece.

the other theme in these positions is b5 and Ra7, defending across the 7th rank - often black king gets checked over to Q-side. But, black has removed this option from himself. Yes, I think Fischer would have sacced.
it just looks right.
Parent - By Eelco de Groot (***) Date 2018-03-16 11:56
Thanks much for the Sicilian chessopening insights Mr. Whittington. It really cheered up my day!

Also good to read that some people think this way about chess, instead of just memorizing variations. It makes me want to follow some tournaments again, like the Candidates tournament in Berlin. Vlastimil Hort memories of Fischer. Had not followed anything for quite some time. I wish Anish Giri would play there in Berlin, but alas, he does not seem to have qualified.

Thanks!
Eelco
Parent - By Vinvin (***) [be] Date 2018-03-31 18:40
SF confirms very good eval for white with 2 best moves :

Stockfish_180326_x64_modern:
...
32/46  03:48   2 117 716k  9 249k  +1,23  1.Kb1 g5 2.fxg5 hxg5 3.Bxg5 b5 4.Qh4 b4 5.Na4 Qa5 6.e5 Qxe5 7.Bf4 Qd5 8.Bf3 Ne4 9.Qe1 Bb7 10.Rf1 Rc8 11.Qxb4 a5 12.Qa3 Qc4 13.Be2 Qb4 14.Qxb4 axb4 15.Bb5 Rxg2 16.Nb6 Rc7 17.Nxd7 Rxd7
32/65  03:48   2 117 716k  9 249k  +1,27  1.e5 dxe5 2.fxe5 Qxe5 3.Qf3 Qc5 4.Bg3 Ne5 5.Nb3 Nxf3 6.Nxc5 Bxc5 7.Bxb8 Nd4 8.Bd3 Ke7 9.Rhe1 b5 10.a4 bxa4 11.Nxa4 Bb4 12.Nc3 Rd8 13.Ba7 Rd7 14.Bb6 Rd6 15.Bc7 Rd7 16.Be5 Nc6 17.Bxf6+ gxf6 18.Re4 a5 19.Rh4 Ne5 20.Be2 Bb7 21.Rxd7+ Nxd7 22.Rxh6 Bxc3 23.bxc3
32/55  03:48   2 117 716k  9 249k  +1,27  1.Bxf6 Nxf6 2.e5 dxe5 3.fxe5 Nd7 4.Nxe6 fxe6 5.Qg6+ Kd8 6.Kb1 Qxe5 7.Rhe1 Bh4 8.g3 Qf5 9.Qxf5 exf5 10.gxh4 b5 11.Bd3 Rf8 12.Ne2 Re8 13.Nd4 Rb6 14.Rxe8+ Kxe8 15.Nxf5 Kf8 16.Rf1 Nf6 17.Nd4 b4 18.Re1 Rd6 19.c3 bxc3 20.bxc3 Nd5 21.Kc2
32/49  03:48   2 117 716k  9 249k  +1,86  1.Rhf1 g5 2.fxg5 Ne5 3.Nf3 hxg5 4.Bxg5 Nxf3 5.Bxf3 Nd7 6.Bxe7 Rxg3 7.Bxd6 Qxd6 8.Rxd6 Rg8 9.Rh1 Ke7 10.Rd2 Ne5 11.h4 Bd7 12.Ne2 Rh8 13.Nd4 Rbg8 14.h5 Rh6 15.Rh4 f6 16.g4 Nxf3 17.Nxf3 e5 18.Rg2 b5 19.c3 a5 20.b3 b4 21.Kb2 Rc8 22.cxb4 axb4
32/51  03:48   2 117 716k  9 249k +2,57  1.Nxe6 fxe6 2.Qg6+ Kf8 3.Rhf1 Qd8 4.e5 Qe8 5.Qg3 b5 6.exf6 gxf6 7.Qe3 Qf7 8.f5 e5 9.Nd5 Bb7 10.Bf3 Kg7 11.Qe2 Rbc8 12.Nxe7 Bxf3 13.gxf3 Qxe7 14.Qd2 Kh7 15.Qxd6 Rg7 16.Qxe7 Rxe7 17.Rd6 Rc4 18.Bg3 a5 19.Rfd1 Rc7 20.R1d5 Rb7 21.b3
Up Topic The Rybka Lounge / Test Positions / Rhf1 is pretty good...

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