[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
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
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.
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

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