Kasparov-Ribli, Skelleftea 1989

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Topic The Rybka Lounge / Test Positions / Kasparov-Ribli, Skelleftea 1989

By MoKy

Date 2011-11-14 01:03

Kasparov missed a beautiful win

5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - - 0 27

By Eelco de Groot (***)

Date 2011-11-14 06:35 Edited 2011-11-14 06:44

[Event "World Cup"]
[Site "Skelleftea"]
[Date "1989.08.??"]
[Round "14"]
[White "Kasparov, Garry"]
[Black "Ribli, Zoltan"]
[Result "1/2-1/2"]
[ECO "A30"]
[WhiteElo "2775"]
[BlackElo "2605"]
[PlyCount "51"]
[EventDate "1989.08.??"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "SWE"]
[EventCategory "16"]
[Source "ChessBase"]
[SourceDate "2004.01.01"]

1. c4 c5 2. Nf3 Nf6 3. Nc3 e6 4. g3 b6 5. Bg2 Bb7 6. O-O Be7 7. d4 cxd4 8. Qxd4
d6 9. Rd1 a6 10. Ng5 Bxg2 11. Kxg2 Nc6 12. Qf4 Ra7 13. Nge4 Rd7 14. Be3 Ne5 15.
Nxf6+ Bxf6 16. Na4 Qa8+ 17. Kg1 Qc6 18. Nxb6 Rb7 19. c5 dxc5 20. Nc4 Nxc4 21.
Qxc4 Bxb2 22. Rab1 O-O 23. Qxc5 Qa4 24. Rd2 Rb5 25. Qc6 Bd4 26. Rxb5 1/2-1/2

It looks good, Rd8, it seems Black has to sacrifice the queen in turn after White sacs a rook but still can't do nothing against white Qxa6, and then the pawn just walks through!
Kasparov would have liked it if he found that move on the chessboard, and Ribli was a hard to beat grandmaster, he played very safe always.

Eelco

5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - -

Engine: Stockfish Kingdefender (Rainbow Serpent, Build 083, Athlon 2009 MHz, 256 MB)
by Tord Romstad, Marco Costalba and Joona Kiiski

1/01   0:00   +0.04 1.fxe3 axb5 (450) 1

2/02   0:00   +0.04 1.fxe3 axb5 (560) 2

3/03   0:00   +0.24 1.fxe3 axb5 2.Rd7 Qxa2 3.Qxb5 (859) 3

4/04   0:00   +0.04 1.fxe3 axb5 2.Rd7 Ra8 (1.247) 4

5/05   0:00   +0.08 1.fxe3 axb5 2.Rd7 Qc4 3.Qxc4 bxc4 (1.833) 7

6/07   0:00   -0.16 1.fxe3 axb5 2.Rd7 Qxa2 3.Qxb5 Ra8 (4.681) 18

7/08   0:00   +0.44 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rd7 Ra8
   4.Kf2 (6.201) 24

8/11   0:00   +0.16 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Ra8
   4.Rxb5 g6 5.Rb2 Kg7 (11.630) 43

9/11   0:00   +0.16 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Ra8
   4.Rxb5 g6 5.Rb2 Kg7 (12.298) 46

10/15 0:00   0.00    1.fxe3 Qxb5 2.Qd6 Qb1+ 3.Kf2 Qf5+
   4.Kg1 Qb1+ (32.367) 103

11/15 0:00   0.00    1.fxe3 Qxb5 2.Qd6 Qb1+ 3.Kf2 Qf5+
   4.Kg1 Qb1+ (37.381) 119

12/15 0:00   0.00    1.fxe3 Qxb5 2.Rc2 Qe5 3.Kf2 Qf5+
   4.Kg2 Qe5 5.Kf2 (66.501) 177

13/21 0:00   +0.28 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 Kf8 6.Kf2 Rxa2
   7.Rb7 Ke8 8.Rc7 g6 9.Kf3 (113.640) 250

14/22 0:00   +0.20 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 Kf8 6.Rb2 Ke7 7.Kf2 Kf6
   8.h3 Ra7 9.Kf3 Ke5 10.Rb5+ Kd6
   11.Rb2 (132.590) 273

15/27 0:00   +0.16 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 Kf8 6.Rb2 Ke7 7.Kf2 Kf6
   8.h3 Ra7 9.Kf3 Ke5 10.Rc2 g6 11.Rb2 Kd5
   12.Rb5+ Kc4 13.Rb2 (177.619) 324

16/32 0:00   +0.16 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 Kf8 6.Rb2 Ke7 7.Kf2 Kf6
   8.Kf3 Ke5 9.Rc2 Ra7 10.g4 Kd5
   11.Rd2+ Ke5 12.Rb2 Kd5 13.e4+ Ke5
   14.Rb5+ (248.655) 378

17/36 0:00   +0.20 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kg2 Kf6
   8.Kf2 Ke5 9.Kf3 h6 10.h3 h5 11.Rb7 Kf6
   12.Rb2 Ke5 (418.363) 461

18/36 0:01   +0.16 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kg2 Kf6
   8.Kf2 Ke5 9.Kf3 h6 10.h3 h5 11.Rc2 f5
   12.Rb2 g5 13.Rb5+ Kd6 14.Rb2 (526.100) 487

19/36 0:01   +0.12 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kg2 Kf6
   8.Kf2 Ke5 9.Kf3 h6 10.h3 h5 11.Rc2 f5
   12.h4 Kd5 13.Rb2 Ke5 14.Rb5+ (641.222) 506

20/36 0:01   +0.12 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kg2 Kf6
   8.Kf2 Ke5 9.Kf3 h6 10.h3 h5 11.Rc2 f5
   12.h4 Kd5 13.Rb2 Ke5 14.Rb5+ (771.739) 519

21/36 0:01   +0.12 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kg2 Kf6
   8.Kf2 Ke5 9.Kf3 h6 10.h3 h5 11.Rc2 f5
   12.h4 Kd5 13.Rb2 Ke5 14.Rb5+ (925.566) 543

22/39 0:02   +0.20++ 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.g4 h6 10.e4 Kd4 11.Rb4+ Kc5
   12.Rb7 Ra3+ 13.Kf2 f6 14.Rg7 (1.234.836) 568

22/39 0:02   +0.12 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.g4 h6 10.e4 Kd4 11.Rb4+ Kc5
   12.Rb7 Ra3+ 13.Kf2 Rxa2 14.Rxf7 (1.296.781) 564

23/39 0:02   +0.20++ 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Kf2 g6 5.Kf3 Kg7 6.Ke4 b4 (1.334.373) 565

23/39 0:02   +0.12 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.h3 Ra7 10.Rd2 Ra4 11.g4 f5
   12.Rb2 fxg4+ 13.hxg4 h6 14.Rb5+ (1.560.371) 570

24/39 0:02   +0.20++ 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.g4 h6 10.e4 Kd4 11.Rb4+ Kc5
   12.Rb7 Ra3+ 13.Kf2 Rxa2 14.Rxf7 (1.664.018) 575

24/39 0:03   +0.20 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.g4 h6 10.e4 Ra5 11.e3 Ra4
   12.h3 Ra5 13.h4 h5 14.g5 (1.763.153) 578

25/39 0:03   +0.12-- 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.g4 h6 10.e4 Ra5 11.e3 Ra4
   12.h3 Ra5 13.h4 Kf6 14.Kf4 (2.003.949) 582

25/39 0:03   +0.12 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.g4 h6 10.e4 Ra5 11.e3 Ra4
   12.h3 Ra5 13.h4 Kf6 14.Rc2 (2.234.860) 586

26/39 0:04   +0.16 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.e4 Ra4 10.e3 Ra5 11.h3 h6
   12.h4 f6 13.g4 g5 14.hxg5 (2.662.857) 591

27/41 0:05   +0.08-- 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.e4 Ra4 10.e3 Ra5 11.h3 h6
   12.h4 g5 13.Rb7 Kf6 14.Rb2 (3.550.995) 593

27/41 0:07   +0.08 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.e4 Ra5 10.g4 h6 11.e3 Ra4
   12.h3 Ra5 13.h4 Kf6 14.Rc2 (4.233.275) 588

28/41 0:08   +0.08 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.e4 Ra5 10.g4 h6 11.e3 Ra4
   12.h3 Ra5 13.h4 Kf6 14.Rc2 (4.732.972) 584

29/41 0:09   +0.08 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.e4 Ra3+ 10.e3 h5 11.Rb5+ Kf6
   12.h4 Rxa2 13.e5+ Kg7 14.Rb4 (5.504.591) 595

30/41 0:10   +0.08 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.e4 Ra5 10.g4 h6 11.e3 Ra4
   12.h3 Ra5 13.h4 Kf6 14.Rc2 (6.304.472) 594

31/41 0:14   +0.08 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Ra8 5.Rxb5 g6 6.Rb2 Kg7 7.Kf2 Kf6
   8.Kf3 Ke5 9.e4 Ra5 10.g4 h6 11.e3 Ra4
   12.h3 Ra5 13.h4 Kf6 14.Rc2 (8.844.593) 593

32/41 0:21   0.00--   1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Kf8 5.h3 Ra8 6.Rxb5 Rxa2
   7.Rb8+ Ke7 8.Kf2 Kf6 9.Kf3 Kg6 (12.662.399) 601

32/41 0:28   -0.08-- 1.fxe3 Qxb5 2.Qxb5 axb5 3.Rb2 Rb8
   4.Rb4 Kf8 5.a4 Ke7 6.axb5 Rb7 7.b6 Kd6
   8.Kg2 Kc5 9.Rh4 h6 10.Rg4 f6 (17.210.499) 598

32/58 6:45   +0.16++ 1.Rd8 Qxb5 2.Qd6 Bxf2+ 3.Kxf2 Qf5+
   4.Kg2 Qe4+ 5.Kh3 Qf5+ 6.g4 Qf1+
   7.Kg3 Qe1+ 8.Kg2 Qxe2+ 9.Kg3 Qe1+
   10.Kg2 Qe2+ (242.499.299) 598

32/58 7:08   +0.34++ 1.Rd8 Qxb5 2.Qd6 Bxf2+ 3.Kxf2 Qf5+
   4.Kg2 Qe4+ 5.Kh3 Qf5+ 6.g4 (258.156.866) 602

32/58 7:28   +0.61++ 1.Rd8 Qxb5 2.Qd6 Bxf2+ 3.Kxf2 Qf5+
   4.Kg1 (271.335.418) 605

32/59 7:38   +1.02++ 1.Rd8 Qxb5 2.Qd6 Bxf2+ 3.Kxf2 Qf5+
   4.Kg1 Qb1+ 5.Kg2 Qe4+ 6.Kh3 Qf5+
   7.g4 Qf1+ 8.Kg3 Qg1+ 9.Kf3 Qf1+
   10.Ke3 Qh3+ 11.Kd4 e5+ 12.Kd5 Qg2+
   13.Kc5 Qg1+ 14.Kc6 (278.417.033) 607

32/59 7:54   +1.63++ 1.Rd8 Qxb5 2.Qd6 Bxf2+ 3.Kxf2 Qf5+
   4.Kg1 Qb1+ 5.Kg2 Qe4+ 6.Kh3 Qf5+
   7.g4 Qf1+ 8.Kg3 Qg1+ 9.Kf3 Qf1+
   10.Ke3 Qh3+ 11.Kd4 Qxg4+ 12.Kc3 Qh3+
   13.Kb2 h6 (288.790.582) 609

32/59 8:25   +2.55++ 1.Rd8 Qxb5 2.Qd6 Bxf2+ 3.Kxf2 Qf5+
   4.Kg1 Qb1+ 5.Kg2 Qe4+ 6.Kh3 Qf5+
   7.g4 Qf1+ 8.Kg3 Qg1+ 9.Kf3 Qf1+
   10.Ke3 Qh3+ 11.Kd4 Qxg4+ 12.Kc3 Qh3+
   13.Kb2 h6 14.Qxf8+ (309.191.859) 611

32/65 10:43 +3.91++ 1.Rd8 Qxb5 2.Qd6 Bxf2+ 3.Kxf2 Qf5+
   4.Kg1 Qb1+ 5.Kg2 Qe4+ 6.Kh3 Qf5+
   7.g4 Qf1+ 8.Kg3 Qg1+ 9.Kf3 Qf1+
   10.Ke3 Qh3+ 11.Kd4 Qxg4+ 12.Kc3 Qh3+
   13.Kb2 h6 14.Qxf8+ (394.991.133) 613

32/68 20:34 +4.00 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 Kf8 5.a4 Ke7 6.Qb7+ Rd7
   7.Qb4+ Ke8 8.a5 Ba7 9.e3 Rd1+ 10.Kg2 g6
   11.Qa4+ Rd7 12.a6 h6 13.Kf3 h5
   14.Qb5 (767.091.508) 621

33/68 21:10 +4.00 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 Kf8 5.a4 Ke7 6.Qb7+ Rd7
   7.Qb4+ Ke8 8.a5 Ba7 9.e3 Rd1+ 10.Kg2 g6
   11.Qa4+ Rd7 12.a6 Bc5 13.Qb5 Ba7
   14.Kf3 (789.955.072) 621

34/68 23:38 +4.12++ 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 Kf8 5.Qb7 Ke8 6.e3 Bf6 7.Qc6+ Kf8
   8.a4 Be7 (881.142.555) 621

34/68 24:32 +4.24++ 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 Kf8 5.Qb7 Ba1 6.a4 Rd1+ 7.Kg2 Ke8
   8.a5 (914.494.895) 620

34/68 25:07 +4.42++ 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 Kf8 5.Qb7 Ba1 6.a4 Rd1+ 7.Kg2 Ke8
   8.a5 (935.988.481) 620

34/68 28:49 +4.64 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 g6 5.a4 Rd5 6.a5 Kg7 7.Qc4 (1.077.554.916) 622

35/68 31:20 +4.52-- 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 h5 5.a4 g5 6.a5 h4 7.gxh4 gxh4
   8.Kg2 Be5 9.Qb7 Rb8 10.Qe4 Bd6 (1.170.873.499) 622

35/68 32:17 +4.76++ 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 (1.206.501.504) 622

35/68 34:59 +4.40-- 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 g5 5.a4 Kg7 6.a5 Rd5 (1.308.444.950) 623

35/68 36:02 +4.94++ 1.Rd8 Rxd8 2.Rd5 Qd4 3.Rxd4 Bxd4
   4.Qxa6 g5 5.a4 Kg7 6.a5 Rd5 7.Qa8 Rd7
   8.Qc6 Re7 9.Qd6 Bf6 10.a6 Ra7 11.Kg2 h6
   12.Qb6 Ra8 13.a7 Bd8 14.Qc5 (1.346.419.963) 622

best move: Rd2-d8 time: 36:13.000 min n/s: 622.707 nodes: 1.346.419.963

By MoKy

Date 2011-11-14 08:25

1.Rd8!! Qxb5 (1...Rxd8 2.Rd5!) 2.Qd6! Bxf2+! 3.Kxf2 Re8 (3...Qf5+ 4.Kg1!) 4.a4!!

By Xaggard (**)

Date 2011-11-15 19:01

Strelka can see it immediately!

By Eelco de Groot (***)

Date 2011-11-16 02:33 Edited 2011-11-16 02:44

Well, HIARCS 7 was also pretty good in 1999. But it is just a guess I think Strelka 5 also does not see more than a repetition at first. I have not tried it but Rainbow Serpent does not see more than 0.00 when it chooses fxe3 so I consider it a bit of luck if you choose Rd8 with the same score. You can look up the position in the old CCC archives, Bruce Moreland brought it up in 1999 after an article in the ICCA Journal (which is now the ICGA). Other programs could not see it though, at least not Crafty on the hardware of the time which was maybe the Pentium Pro 200 or by then the much better DEC Alpha chip, which groundbraking architecture did not really survive, although I believe some of it was reincarnated in later, ARM based, processors?

Author: Robert Hyatt

On March 19, 1999 at 14:59:52, Peter McKenzie wrote:

>On March 19, 1999 at 12:48:04, Bruce Moreland wrote:
>
>>5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - - 0 1
>>
>>The key is 1. Rd8, which Kasparov didn't find.
>>
>>It isn't hard to find for a computer, but I think they will typically think it
>>is a draw. Can anyone find a score that indicates *significant* advantage to
>>white?
>
>Not me.
>I let Chop run for about half an hour on this one, and it was still saying Rd8
>with a 0.00 score at the end.
>
>>
>>What this means in practice is, can anyone resolve (hopefully from the root) the
>>near-perpetual after:
>>
>>1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>>
>>bruce

I searched this a while and got this:

   11-> 12.90   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
   12 16.30   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
   12-> 26.07   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
   13 35.13   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
   13-> 59.52   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
   14    1:49   0.26   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Ke3 Qh3+
10. Kd2 Qh6+ 11. e3 g5 12. Rxf8+ Qxf8
13. Qxa6
   14->   2:28   0.26   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Ke3 Qh3+
10. Kd2 Qh6+ 11. e3 g5 12. Rxf8+ Qxf8
13. Qxa6
   15    3:25   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3
   15->   6:17   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3
   16    8:43   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3

So for one brief moment at depth=14 I had a slightly + score, but it dropped
back to 0.00

Bob

Author: Hans Havermann

On March 19, 1999 at 15:27:42, Robert Hyatt wrote:

>    11-> 12.90   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>    12 16.30   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>    12-> 26.07   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>    13 35.13   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>    13-> 59.52   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. Kg2
>    14    1:49   0.26   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
> 7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Ke3 Qh3+
> 10. Kd2 Qh6+ 11. e3 g5 12. Rxf8+ Qxf8
> 13. Qxa6
>    14->   2:28   0.26   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
> 7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Ke3 Qh3+
> 10. Kd2 Qh6+ 11. e3 g5 12. Rxf8+ Qxf8
> 13. Qxa6
>    15    3:25   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
>    7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3
>    15->   6:17   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
> 7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3
>    16    8:43   0.00   1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
> 4. Kg2 Qe4+ 5. Kh3 Qf5+ 6. g4 Qf1+
> 7. Kg3 Qg1+ 8. Kf3 Qf1+ 9. Kg3

Interesting to contrast this with Crafty 16.3 (the latest available Macintosh
build):

10-> 21.43   0.00   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg2   Qe4+
5. Kh3   Qf5+ 6. Kg2
11 31.71   0.00   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg2   Qe4+
5. Kh3   Qf5+ 6. Kg2
11 45.76   0.20   1. fxe3 axb5 2. Rd7   Qxa2 3. Qxb5 Qa1+ 4. Kg2   Qa8+
5. Qb7   Qxb7+ 6. Rxb7 f6 7. Re7   e5 8. Kf3   Rd8
11-> 55.78   0.20   1. fxe3 axb5 2. Rd7   Qxa2 3. Qxb5 Qa1+ 4. Kg2   Qa8+
5. Qb7   Qxb7+ 6. Rxb7 f6 7. Re7   e5 8. Kf3   Rd8
12    1:32   0.19   1. fxe3 axb5 2. Rd7   Qxa2 3. Qxb5 Qa1+ 4. Kg2   Qc1
5. e4 Qe1   6. Qc4   <HT>
12->   2:03   0.19   1. fxe3 axb5 2. Rd7   Qxa2 3. Qxb5 Qa1+ 4. Kg2   Qc1
5. e4 Qe1   6. Qc4   <HT>
13    4:31   0.23   1. fxe3 axb5 2. Kf2   Qa5   3. Rd7   b4 4. Qc4   Ra8
5. e4 Kf8   6. Rb7   Qa3   7. Qc7   Qxa2 8. Qxf7#
13->   6:24   0.23   1. fxe3 axb5 2. Kf2   Qa5   3. Rd7   b4 4. Qc4   Ra8
5. e4 Kf8   6. Rb7   Qa3   7. Qc7   Qxa2 8. Qxf7#
14    9:50   0.18   1. fxe3 axb5 2. Kf2   Qa5   3. Rd7   b4 4. Qc4   Ra8
5. Rb7   Qh5   6. Kg2   Qa5   7. h3 Qa3
14 29:09   0.54   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg1   Qb1+
5. Kg2   Qe4+ 6. Kh3   <HT>
14-> 31:47   0.54   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg1   Qb1+
5. Kg2   Qe4+ 6. Kh3   <HT>
15 50:55   0.54   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg1   Qb1+
5. Kg2   Qe4+ 6. Kh3   <HT>
15-> 57:45   0.54   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg1   Qb1+
5. Kg2   Qe4+ 6. Kh3   <HT>
16   116:03   0.42   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg1   Qb1+
5. Kg2   Qe4+ 6. Kh3   Qf5+ 7. g4 Qf1+ 8. Kg3   Qg1+
9. Kf3   Qf1+ 10. Ke3   Qh3+ 11. Kd2   Qh6+ 12. Kd3   g5
   13. Rxf8+ Qxf8 14. Qxa6 Qc5
16-> 135:20   0.42   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg1   Qb1+
5. Kg2   Qe4+ 6. Kh3   Qf5+ 7. g4 Qf1+ 8. Kg3   Qg1+
9. Kf3   Qf1+ 10. Ke3   Qh3+ 11. Kd2   Qh6+ 12. Kd3   g5
   13. Rxf8+ Qxf8 14. Qxa6 Qc5
17   314:20   0.23   1. Rd8   Qxb5 2. Qd6   Bxf2+ 3. Kxf2 Qf5+ 4. Kg2   Qe4+
5. Kh3   Qf5+ 6. g4 Qf1+ 7. Kg3   Qe1+ 8. Kf3   Qf1+
9. Ke3   Qh3+ 10. Kd2   Qh6+ 11. Kd1   g5   12. Rxf8+ Qxf8
   13. Qxa6 Qb4 14. Qa8+ Kg7 15. Qf3

[end of absent quotes tags and not working teletype tags, if I post and try to put the tt tags around the CCC teletype by hand, the forum software gets totally confused]

I looked up the game in my ChessBase version of HIARCS 11.2 and by accident ran HIARCS 11.2 before I had a look at the stmintz.com thread, and HIARCS 11.2 could still find Rd8 from even one ply earlier and in 5 move multi PV, at first it only saw 0.00 I think but still went for it. After a while the score started to climb again, so I think it is still good at it.

By rocket

Date 2016-07-21 17:06 Edited 2016-07-21 17:11

Deep Fritz 10.1 spots Rd8 (as winning) in 1 or 2 seconds, all tries. Houdini 4 tactical is slower at 14 seconds first try, 49 seconds second try.

By Felix Kling (Gold)

Date 2016-07-25 06:27

wasn't this one of the positions Botvinnik claimed to be solved by his chess engine and stating a wrong line? :-)

By Eelco de Groot (***)

Date 2016-07-26 12:26 Edited 2016-07-26 12:42

Progress of hard and software in the past years since those posts from Robert, Bruce and Peter on CCC has been remarkable, today it seems trivial to solve it. Today's Rainbow Serpent:

5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - -

Engine: Rainbow Serpent 20160626_033 MP (17 6700, 4 threads, 512 MB)
TDM-GCC 5.1.0 -bmi2 Real 64 bit! Thanks to Lyudmil and Pasquale for their help.
Experimental build with Giri reductions,
(Okay, I just made that up. It is a bit silly code and looks obfuscated. But the actual code)

  // Null move dynamic reduction based on depth and value
  improving =    ss->staticEval >= (ss-2)->staticEval
             && (ss-2)->staticEval >= beta
             &&  ss->staticEval != VALUE_NONE
             && (ss-2)->staticEval != VALUE_NONE;
  Depth R = ((823 + (improving ? 260 + int(eval - beta) : int(log(depth)) * int(log(depth))) + 67 * depth)
           / 256 + std::min(pawnsAboveBeta, 3)) * ONE_PLY;

by T. Romstad, M. Costalba, J. Kiiski, G. Linscott

20/47 0:01   +3.22 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 g5 31.a4 h5 32.a5 h4 33.Qc4 Bf6
   34.a6 Rd1+ 35.Kg2 Ra1 36.Kf3 Kg7
   37.Ke3 hxg3 38.hxg3 Ra3+ 39.Ke4 (18.294.223) 9872

21/47 0:02   +3.21 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 Kf8 31.a4 Rd7 32.Qb5 Ke7
   33.Qb4+ Ke8 34.a5 Ba7 35.e3 g6
   36.Kg2 h5 37.a6 Rc7 38.Kf3 Kd7
   39.Qa4+ Kd6 40.Qf4+ (21.614.321) 9842

22/47 0:03   +3.29++ 27.Rd8 (32.837.123) 9834

22/47 0:03   +3.36++ 27.Rd8 (34.819.074) 9858

22/47 0:03   +3.36 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 Kf8 31.a4 Rd7 32.Qb5 Ke7
   33.Qb4+ Ke8 34.e3 Ba7 35.Qc3 Kf8
   36.Qc8+ Ke7 37.Qg8 g6 38.Qxh7 Kd6
   39.Kg2 Bc5 40.Qh8 (35.191.123) 9860

23/47 0:05   +3.44++ 27.Rd8 (51.682.558) 9895

23/47 0:05   +3.52++ 27.Rd8 (57.770.893) 9936

23/47 0:06   +3.63++ 27.Rd8 (65.532.122) 9995

23/47 0:06   +3.54-- 27.Rd8 Rxd8 (69.008.618) 10008

23/47 0:07   +3.54 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 Kf8 31.a4 Ke7 32.Qb7+ Rd7
   33.Qb4+ Ke8 34.e3 Ba7 35.Qc3 f5
   36.Kg2 Re7 37.Qc8+ Kf7 38.a5 Re8
   39.Qc7+ Re7 40.Qc3 (72.604.284) 10003

24/47 0:08   +3.62++ 27.Rd8 (82.891.892) 10017

24/47 0:08   +3.67 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 Kf8 31.a4 Ke7 32.Qb7+ Rd7
   33.Qb4+ Ke8 34.e3 Ba7 35.Qc3 f5
   36.a5 Re7 37.Qc8+ Kf7 38.Kg2 Re8
   39.Qc7+ Re7 40.Qc3 (83.230.889) 10014

25/53 0:09   +3.71 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 Kf8 31.a4 Ke7 32.Qb7+ Rd7
   33.Qb4+ Ke8 34.e3 Ba7 35.Qc3 f5
   36.a5 Re7 37.Qc8+ Kf7 38.Kg2 Re8
   39.Qc7+ Re7 40.Qc3 (97.617.355) 10034

26/53 0:11   +3.79++ 27.Rd8 (114.133.055) 10054

26/53 0:11   +3.80 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 Kf8 31.e3 Bc5 32.a4 Ke7
   33.Qb5 Rd5 34.Kg2 Ba7 35.Qb4+ Ke8
   36.Qb7 Rd7 37.Qa8+ Ke7 38.Qg8 g6
   39.Qxh7 Rd5 40.Qh4+ (119.152.120) 10042

27/53 0:14   +3.88++ 27.Rd8 (140.547.705) 10019

27/53 0:15   +3.96++ 27.Rd8 (152.626.739) 10020

27/53 0:16   +4.07++ 27.Rd8 (165.953.243) 10041

27/53 0:19   +4.15 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 Kf8 31.e3 Bc5 32.a4 Ke7
   33.Qb5 Rd1+ 34.Kg2 Ba7 35.Qb4+ Ke8
   36.Qe4 Rd7 37.Qxh7 g6 38.Qg8+ Ke7
   39.Qc8 Kd6 40.Qa6+ (198.931.572) 10048

28/53 0:31   +4.23++ 27.Rd8 (317.690.161) 10192

28/53 0:31   +4.31++ 27.Rd8 (323.430.266) 10194

28/53 0:33   +4.43++ 27.Rd8 (340.781.293) 10190

28/53 0:37   +4.59++ 27.Rd8 (383.821.965) 10177

28/53 0:46   +4.81++ 27.Rd8 (476.800.107) 10185

28/53 0:53   +4.63-- 27.Rd8 Rxd8 (542.871.907) 10238

28/53 1:02   +4.87++ 27.Rd8 (636.699.693) 10227

28/53 1:13   +5.00 27.Rd8 Rxd8 28.Rd5 Qd4 29.Rxd4 Bxd4
   30.Qxa6 g5 31.a4 h5 32.a5 h4 33.e3 Be5
   34.Qb7 hxg3 35.hxg3 Kg7 36.a6 Bb8
   37.Kg2 Kf6 38.Qb6 Ke7 39.a7 Bxa7
   40.Qxa7+ (749.327.856) 10196

29/53 1:18   +5.05 27.Rd8 Rxd8 28.Rd5 exd5 29.Qxa4 Bc5
   30.Qa5 Be7 31.Qxa6 Bf6 32.a4 d4
   33.a5 d3 34.exd3 Kf8 35.Qb7 Bd4
   36.a6 g6 37.a7 Bxa7 38.Qxa7 Rxd3
   39.Qb8+ Kg7 40.Qe5+ (796.073.998) 10194

best move: Rd2-d8 time: 1:18.203 min n/s: 10.194.575 nodes: 796.073.998

By rocket

Date 2017-10-23 09:16

Deep Fritz 10.1 1 CPU solves Rd8 it in 2 seconds. The other ones don't get it within the time given.

By Wallybal Date 2017-11-05 05:44

It did not got time enough to reach 1 sec to play that move :cool:

Topic The Rybka Lounge / Test Positions / Kasparov-Ribli, Skelleftea 1989