Author: Eelco de Groot
Date: 05:21:31 03/05/01
Go up one level in this thread
Not very important all this after your thorough analysis, Albert, but in the
spirit of Robert Hübner; some more lines to the draw!
With mainly Gambit Tiger I looked at some variations if White gives check with
51.Qd7+ instead of 51.Qc7+ in Uri's "triangle variation" but the result seems to
be very drawish again. Gambit Tiger could find 49. ..Qd3! by the way after a
long search and then went on to play and analyze 50.Kg1 all by itself even
though it was in analysis mode and 'infinite time'! I think that happened
because of the overflow bug... You could argue that there is something to be
said for 51.Qd7+ because it defends the f5-pawn, attacks the b5-pawn and White
can later play Qd7-c7 which in some lines has the same effect of directly
playing Qc7+; if Black then moves both King and Rook one square to the
king-side, to get out of the way of the d-pawn. Mainly though I analyzed 51.Qd7+
because that was the move Gambit Tiger wanted to play. However Tigre does not
make the combined King and Rook maneuver, this is Gambit Tiger's main line after
45...Qe3 46.Qxd6 Re8 47.Qd7+ Re7 48.Qc6 Qxe4 49.d6 Qd3 50.Kg1 Re8 51.Qd7+ Kf8 at
the moment, and the score is 0.00:
[D]4rk2/3Q2p1/R2P1p1p/1p2pP2/1Pp5/2Pq3P/6P1/6K1 w - - 12 1
00:00:00.6 0,00 7 53777 Ra7 Qe3+ Kh2 Qf4+ Kg1 Qe3+
00:00:00.4 0,00 7 62377 Ra7 Qe3+ Kh2 Qf4+ Kg1 Qe3+
00:00:01.3 0,00 8 132008 Ra7 Qe3+ Kh2 Qf4+ Kg1 Qe3+
00:00:02.5 0,00 9 292156 Ra7 Qe3+ Kh2 Qf4+ Kg1 Qe3+
00:00:04.6 0,00 10 632910 Ra7 Qe3+ Kh2 Qf4+ Kg1 Qe3+
00:00:12.9 0,00 11 1658680 Ra7 Qe3+ Kh2 Qf4+ Kg1 Qe3+
00:00:32.4 0,00 12 4503283 Ra7 Qe3+ Kh2 Qf4+ Kg1 Qe3+
00:01:36.7 0,60 12 13329632 Kh2 Qd2 Ra1 Qf4+ Kh1 e4 Qxb5 Qxd6 Qxc4 e3 Ra7 Qd1+
Kh2 Qd6+ Kg1
00:02:10.6 0,38 13 18176701 Kh2 Qd2 Ra1 Qf4+ Kh1 e4 Qc6 Rd8 Qxb5 Qxd6 Qxc4 e3
Kg1 Ke7
00:03:53.7 0,30 14 32980251 Kh2 Qd2 Ra1 Qf4+ Kh1 e4 Qc6 Qd2 d7 Rd8 Qxb5 Qxc3
Qc5+ Kf7 Rd1 Qc2 Qd5+ Ke7
00:10:52.0 0,03 15 92970107 Kh2 Qd2 Ra1 Qf4+ Kg1 Qd2 Rf1 Qxc3 Rf3 Qd4+ Kh2 Qd5
Qc7 e4 Rg3 g5 fxg6ep
01:21:28.6 0,00 16 704823476 Kh2 Qd2 Ra1 Qf4+ Kg1 Qd2 Kh2
02:47:37.5 0,00 17 -703632963 Kh2 Qd2 Ra1 Qf4+ Kg1 e4 Qc7 e3 Qc5 Rd8 d7+ Kf7
Qxb5 Qf2+ Kh2 Qf4+ Kg1
06:43:50.9 0,00 18 -813182806 Kh2 Qd2 Ra1 Qf4+ Kg1 e4 Qc7 e3 Qc5 Rd8 d7+ Kf7
Qxb5 Qf2+ Kh2 Qf4+ Kg1
----
Some more analysis of other lines, after 45. ..Qe3 most lines the computer
analyzed seemed to be headed for a draw.
Century 2.0 did not play 45. ..Qe3 ,held to 45. Qxc6 but then so did Kasparov.
Rebel Engine for ECTool. (c) Ed Schröder
Engine version : REBEL CENTURY 2
Rebel personality : Rebel.eng
Opening book file : RebelC.mvs
Hash table size : 4 MB
Analysis mode : Analyzing next move
Refresh interval : 500 ms
Game begin
00:00 04.00 -0.40 1..Qxc6 2.dxc6 Rd8 3.Ra7+ Kf8
00:00 06.00 -0.53 1..Qxc6 2.dxc6 Kf8 3.Ra7 Rd8 4.Ke2 Kg8
00:00 07.00 -0.58 1..Qxc6 2.dxc6 Kf8 3.Ra7 Rd8 4.Ke2 Kg8 5.Bd5 Kh7
00:01 08.00 -0.73 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rd8 4.Bd5+ Kh7 5.Be6 e4
00:03 09.00 -0.82 1..Qxc6 2.dxc6 Kf8 3.Ra7 Rd8 4.Bd5 Bc7 5.Bxc4 bxc4 6.Rxc7
Rd2
00:06 10.00 -0.87 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.Kf2 Kh7 5.Bd5 Bb8 6.Rb7
00:14 11.00 -0.90 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.Rb7 Ra8 5.Rd7 Ra1+ 6.Ke2
Ra2+ 7.Ke3 Bf8
00:37 12.00 -1.10 1..Qxc6 2.dxc6 Re8 3.Ra5 Ke7 4.Ra7+ Kf8 5.Rd7 Be7 6.c7 Rc8
00:59 13.00 -1.07 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.Rb7 Rc7 5.Ke2 Kh7 6.Rxb5 Ra7
7.Rd5
02:24 14.00 -1.36 1..Qxc6 2.dxc6 Rc8 3.Bd5+ Ke7 4.Ra5
06:50 15.00 -1.41 1..Qxc6 2.dxc6 Re8 3.Ra5 Kf8
16:11 16.00 -1.29 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.Rb7 Kh7 5.Rxb5 Bc7 6.Ke2 Ra8
7.Rb7
58:15 17.00 -1.55 1..Qxc6 2.dxc6 Re8 3.Bd5+ Kf8
Q5T in Century 2.0 did choose 45. ..Qe3 but could not see a draw arising in that
line:
Engine version : REBEL CENTURY 2
Rebel personality : "Q5T Experimental"
Opening book file : RebelC.mvs
Hash table size : 4 MB
Analysis mode : Analyzing next move
Refresh interval : 500 ms
Game begin
45:43 16.00 0.28 1..Ra3+ 2.Kf4 Rxa4+ 3.Kg5 Ra5 4.Kg6 Kb7 5.h5
00:00 04.00 -0.75 1..Qxc6 2.dxc6 Rd8 3.Ra7+ Kf8
00:00 07.00 -1.11 1..Qxc6 2.dxc6 Kg8 3.Ra7 Kh7 4.Rd7 Bxb4 5.cxb4 Ra8
00:00 08.00 -1.09 1..Qxc6 2.dxc6 Kg8 3.Ra7 Kh7 4.Rd7 Bf8 5.g3 Ra8
00:02 09.00 -1.16 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rd8 4.Rb7 Ra8 5.Rd7 Bxb4 6.cxb4
Kf8 7.c7 Ke8 8.Bxa8 Kxd7
00:06 10.00 -1.44 1..Qxc6 2.dxc6 Kg8 3.Ra7 Re8 4.Rd7 Bb8 5.g3 Kh8 6.Ke2 Kh7
00:16 11.00 -1.44 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.g3 Rd8 5.Rb7 Rb8 6.Rd7 Bxb4
00:49 12.00 -1.52 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.Rb7 Ra8 5.Rxb5 Ra7 6.Rd5
Ra1+
02:04 13.00 -1.63 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.Rb7 Ra8 5.Rxb5
53:50 13.01 -1.63 1..Qe3
57:15 13.01 -1.50 1..Qe3 2.Qxd6 Re8 3.Qd7+ Re7 4.Qxb5 Qxe4 5.Qc5 Qb1+
02:36 14.00 -1.76 1..Qe3 2.Qxd6 Re8
08:56 14.01 -1.52 1..Qxc6 2.dxc6 Kg8 3.Ra7
31:50 15.00 -1.66 1..Qxc6 2.dxc6 Kg8 3.Ra7 Rc8 4.Rb7
37:39 15.01 -1.66 1..Qe3
45:08 15.01 -1.36 1..Qe3 2.Qxd6 Re8 3.Bf3 Qc1+
Q5T in Century 3.0 was faster I believe in finding 45. ..Qe3 but I can't be
entirely sure because of multitasking. A little closer to zero :-0.91. It
chooses a line not with 47. h4 h5 but almost the same line Ferret gave, with the
difference though that Ferret did not take the Bishop on d6 on move 46, it left
out 46.Qxd6 Re8. It looks a reasonable line this way but I can't be sure it is
optimal, I mainly let the computer look at the end-positions again.
Thinking....
+---+---+---+---+---+---+---+---+ DEEP BLUE - Kasparov,G
8 | | *R| | | | | | |
+---+---+---+---+---+---+---+---+ 00:00:00 00:00:00
7 | | | | | | *K| *p| |
+---+---+---+---+---+---+---+---+
6 | R | *Q| Q | *B| | *p| | *p| Time infinite
+---+---+---+---+---+---+---+---+ Hash 13 Mb
5 | | *p| | p | *p| p | | | Engine Rebel Century 3.0
+---+---+---+---+---+---+---+---+ Personality Q5T3W5.ENG
4 | | p | *p| | B | | | | anti-GM Off
+---+---+---+---+---+---+---+---+ Tactics Off
3 | | | p | | | | | p | Bluff Chess Off
+---+---+---+---+---+---+---+---+ Style Normal
2 | | | | | | | p | | Strength Strongest
+---+---+---+---+---+---+---+---+ Search Deeper Search
1 | | | | | | K | | |
+---+---+---+---+---+---+---+---+ 44.. Kg1-f1 Rb7-b8
a b c d e f g h 45.. Ra8-a6
1r6/5kp1/RqQb1p1p/1p1PpP2/1Pp1B3/2P4P/6P1/5K2 b - -
[Event "?"]
[Site "The rematch, round2"]
[Date "1997.05.04"]
[Round "?"]
[White "DEEP BLUE"]
[Black "Kasparov,G"]
[Result "1-0"]
[WhiteElo "?"]
[BlackElo "?"]
[ECO "C88"]
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3
O-O 9.h3 h6 10.d4 Re8 11.Nbd2 Bf8 12.Nf1 Bd7 13.Ng3 Na5 14.Bc2 c5 15.b3
Nc6 16.d5 Ne7 17.Be3 Ng6 18.Qd2 Nh7 19.a4 Nh4 20.Nxh4 Qxh4 21.Qe2 Qd8
22.b4 Qc7 23.Rec1 c4 24.Ra3 Rec8 25.Rca1 Qd8 26.f4 Nf6 27.fxe5 dxe5
28.Qf1 Ne8 29.Qf2 Nd6 30.Bb6 Qe8 31.R3a2 Be7 32.Bc5 Bf8 33.Nf5 Bxf5
34.exf5 f6 35.Bxd6 Bxd6 36.axb5 axb5 37.Be4 Rxa2 38.Qxa2 Qd7 39.Qa7
Rc7 40.Qb6 Rb7 41.Ra8 Kf7 42.Qa6 Qc7 43.Qc6 Qb6 44.Kf1 Rb8 45.Ra6 1-0
00:00:00 1.00 0.01 45..Qxc6 46.Rxc6
00:00:00 2.00 -0.20 45..Qxc6 46.dxc6 Kf8
00:00:00 3.00 -0.75 45..Qxc6 46.dxc6 Rd8 47.Ra7 Kf8
00:00:00 4.00 -0.75 45..Qxc6 46.dxc6 Rd8 47.Ra7 Kf8
00:00:00 5.00 -0.93 45..Qxc6 46.dxc6 Rd8 47.Ra7 Kf8
48.g3 (0)
00:00:00 6.00 -1.05 45..Qxc6 46.dxc6 Rd8 47.Ra7 Kf8
48.g3 Bb8 (0)
00:00:00 7.00 -0.88 45..Qxc6 46.dxc6 Re8 47.Ra5 Kf8
48.Rxb5 Ra8 (0)
00:00:00 8.00 -1.22 45..Qxc6 46.dxc6 Kg8 47.Ra7 Rd8
48.Bd5 Kh7 49.Be6 Bxb4 50.cxb4 (0)
00:00:00 9.00 -1.22 45..Qxc6 46.dxc6 Kg8 47.Ra7 Rd8
48.Bd5 Kh7 49.Be6 Bxb4 50.cxb4 (0)
00:00:01 10.00 -1.20 45..Qxc6 46.dxc6 Kf8 47.Ra7 Rd8
48.g3 h5 49.Ke2 h4 50.Rd7 (0)
00:00:02 11.00 -1.35 45..Qxc6 46.dxc6 Kf8 47.Ra7 Rd8
48.Rb7 Ra8 49.Rd7 Bxb4 50.cxb4 Kg8
51.g3 (1)
00:00:05 12.00 -1.39 45..Qxc6 46.dxc6 Kf8 47.Ra7 Rd8
48.Rb7 Ra8 49.Rd7 Bxb4 50.cxb4 Kg8
51.g3 Kh7 52.Ke2 Ra2 53.Ke1 (3)
00:00:13 13.00 -1.50 45..Qxc6 46.dxc6 Kf8 47.Ra7 Rd8
48.Rb7 Ra8 49.Rxb5 Ra7 50.Rd5 Ra1
51.Ke2 Bc7 (8)
00:00:41 14.00 -1.64 45..Qxc6 46.dxc6 Kf8 47.Ra7 Re8
48.Rb7 Re7 49.Rxb5 (20)
00:02:28 15.00 -2.06 45..Qxc6 46.dxc6 Kf8 47.Ra7 Rc8
48.Rb7 Bc7 49.Rxb5 Rb8 50.Rc5 Ra8 (78)
00:26:18 15.01 -2.06 45..Qe3
00:35:16 15.01 -0.82 45..Qe3 46.Qxd6 Re8 47.Bf3 Qc1 48.Kf2
Qd2 49.Be2 Qf4 50.Kg1 Qe3 51.Kh1 (1578)
01:03:50 16.00 -0.85 45..Qe3 46.Qxd6 Re8 47.Bf3 Qc1 48.Kf2
Qd2 49.Be2 Qf4 50.Kg1 Qc1 51.Bf1
Qe3 (2389)
02:37:37 17.00 -0.91 45..Qe3 46.Qxd6 Re8 47.Bf3 Qc1 48.Kf2
Qd2 49.Be2 Qf4 50.Kg1 Qc1 51.Bf1
Qe3 (4396)
The eval is with -0.91 a little closer to zero and if you take up the line
further on it drops again. I'll spare you the log but at the end of the line 45.
..Qe3 46.Qxd6 Re8 47.Bf3 Qc1 48.Kf2 Qd2 49.Be2 Qf4 50.Kg1 Qc1 51.Bf1 Qe3
personality Q5T shows its aggressive tuning and still tries to avoid perpetual
by playing 52.Kh2 or 52.Kh1 Qc1 53.Ra2 but this costs him material by giving
away the Bishop on f1. Ferret was more prudent and also Chess Tiger 13.0 is more
sensible in this position I think and chooses the perpetual with White at move
52:
[D]4r3/5kp1/R2Q1p1p/1p1PpP2/1Pp5/2P1q2P/6P1/5BK1 w - -
[Event "?"]
[Site "?"]
[Date "??.??.????"]
[Round "?"]
[White "DEEP BLUE"]
[Black "Kasparov,G"]
[Result "*"]
[WhiteElo "?"]
[BlackElo "?"]
[ECO "C88"]
1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3
O-O 9.h3 h6 10.d4 Re8 11.Nbd2 Bf8 12.Nf1 Bd7 13.Ng3 Na5 14.Bc2 c5 15.b3
Nc6 16.d5 Ne7 17.Be3 Ng6 18.Qd2 Nh7 19.a4 Nh4 20.Nxh4 Qxh4 21.Qe2 Qd8
22.b4 Qc7 23.Rec1 c4 24.Ra3 Rec8 25.Rca1 Qd8 26.f4 Nf6 27.fxe5 dxe5
28.Qf1 Ne8 29.Qf2 Nd6 30.Bb6 Qe8 31.R3a2 Be7 32.Bc5 Bf8 33.Nf5 Bxf5
34.exf5 f6 35.Bxd6 Bxd6 36.axb5 axb5 37.Be4 Rxa2 38.Qxa2 Qd7 39.Qa7
Rc7 40.Qb6 Rb7 41.Ra8 Kf7 42.Qa6 Qc7 43.Qc6 Qb6 44.Kf1 Rb8 45.Ra6 *
And then 45. ..Qe3 46.Qxd6 Re8 47.Bf3 Qc1 48.Kf2 Qd2 49.Be2 Qf4 50.Kg1 Qc1
51.Bf1 Qe3
Chess Tiger 13.0:
00:00:00.7 0,04 9 56990 Kh1 Qe1 Kg1 Qe3+
00:00:00.0 0,04 9 87802 Kh1 Qe1 Kg1 Qe3+
00:00:01.0 0,04 10 167264 Kh1 Qe1 Kg1 Qe3+
00:00:02.1 0,04 11 362268 Kh1 Qe1 Kg1 Qe3+
00:00:05.5 0,04 12 687080 Kh1 Qe1 Kg1 Qe3+
00:00:11.5 0,04 13 1567453 Kh1 Qe1 Kg1 Qe3+
00:00:57.9 0,04 14 7959555 Kh1 Qe1 Kg1 Qe3+
00:02:14.4 0,04 15 18999975 Kh1 Qe1 Kg1 Qe3+
00:04:42.9 0,04 16 39854478 Kh1 Qe1 Kg1 Qe3+
00:11:25.3 0,04 17 97040069 Kh1 Qe1 Kg1 Qe3+
Eval of Q5T3W7 [Q5T3W7 is just another try with again slightly changed settings
of Q5T; Q5T3W7 is Q5T3W5 but QUEEN VALUE is default 100 again and CHESS
KNOWLEDGE = 150 and not 130. This does not seem to slow it down much.] at above
diagrammed position:
02:01:18 17.01 0.13 52.Kh1 Qc1 53.Ra2
which leaves the Bishop on f1 undefended. But the eval is close to zero which
was I suppose the main point to all this analysis...
Regards, Eelco
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