Author: Eelco de Groot
Date: 12:36:01 09/09/01
Go up one level in this thread
On September 09, 2001 at 09:28:36, Peter Berger wrote:
>On September 08, 2001 at 19:51:14, Jon Dart wrote:
>
>>[Event "?"]
>>[Site "-"]
>>[Date "2001.09.06"]
>>[Round "?"]
>>[White "Yace 00.99.50"]
>>[Black "Arasan 6.0"]
>>[Result "1-0"]
>>[ECO "B81"]
>>[TimeControl "900+0"]
>>
>>1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e6 7. g4
>>e5 8. Nf5 g6 9. g5 gxf5 10. exf5 d5 11. gxf6 d4 12. Bc4 Qc7 13. Qd3
>>dxe3 14. O-O-O exf2 15. Bxf7+ Kxf7 16. Qd5+ Kxf6 17. Ne4+ Kxf5
>>18. Kb1 Bg7 19. Nd6+ Kg5 20. Qg2+ Kh6 21. Rhg1 Bf6 22. Qxf2 Rf8
>>23. Qe3+ Kh5 1-0 {Black resigns}
>>
>>Black might actually be lost after the sac on move 15 (from
>>this position):
>>
>>rnb1kb1r/1pq2p1p/p4P2/4pP2/2B5/2NQ4/PPP2p1P/2KR3R w kq -
>>
>>but I'm not sure. Crafty doesn't like this sac even after 30
>>minutes search. Crafty also takes a long time to find 17. Ne4+,
>>and it was still failing high after 30 minutes (on a PIII/733),
>>with a - score for White. By move 21, it sees White winning.
>>
>>I'm not sure Black has a defense. In analysis mode, Crafty thought
>>18 .. Bb7 a mistake and prefers .. Bh6. But it still looks very
>>dangerous for Black. The whole attack is pretty impressive - White
>>is really ignoring material and going for the King, although Yace
>>doesn't generally seem to be a reckless sacrifier.
>>
>>--Jon
>
>After some analysis I think Black is plain lost after the decisive mistake
>17...Kxf5 ?? e.g. 18...Bh6 19.Rhf1 Bf4 20.Rxf2 or 18...h5 19.Rhf1 Kg6 20.Rxf2
>
>17...Ke7 looks very OK though 18.Nd6 Bh6+ 19.Kb1 Kf6 20.Rhf1 and now 20...Rf8
>21.Rxf2 Nc6 22.Qc4 Kg7 as in Topalov-van Wely
>or maybe also 20...Nc6 or even 20...Be3 might be satisfactory. But it's
>definitely complicated.
>
>Playing the Najdorf against Yace to expect 6.Be3 and 7.g4 is always a safe
>bet:).
>
>pete
+---+---+---+---+---+---+---+---+ -
8 | *R| *N| *B| | *K| *B| | *R|
+---+---+---+---+---+---+---+---+ 00:00:00 00:00:00
7 | | *p| *Q| | | *p| | *p|
+---+---+---+---+---+---+---+---+
6 | *p| | | | | p | | | Time
+---+---+---+---+---+---+---+---+ Hash 13 Mb
5 | | | | | *p| p | | | Engine Rebel Century 2.0
+---+---+---+---+---+---+---+---+ Personality "Q5T"
4 | | | B | | | | | |
+---+---+---+---+---+---+---+---+
3 | | | N | Q | | | | |
+---+---+---+---+---+---+---+---+
2 | p | p | p | | | *p| | p |
+---+---+---+---+---+---+---+---+
1 | | | K | R | | | | R |
+---+---+---+---+---+---+---+---+
a b c d e f g h
rnb1kb1r/1pq2p1p/p4P2/4pP2/2B5/2NQ4/PPP2p1P/2KR3R w kq -
[Event ""]
[Site ""]
[Date "-9928.-54.-20"]
[Round ""]
[White ""]
[Black ""]
[Result "*"]
[BlackElo ""]
[WhiteElo ""]
[FEN "rnb1kb1r/1pq2p1p/p4P2/4pP2/2B5/2NQ4/PPP2p1P/2KR3R w kq - 0 1"]
1.*
00:00 01.00 -13.18 1.Qd7+ Nxd7
00:00 01.01 -13.04 1.Qd6 Bxd6
00:00 01.02 -3.79 1.Bxf7+ Kxf7
00:00 01.05 -3.31 1.Nd5 Bh6+ 2.Kb1
00:00 01.06 -1.26 1.h4 Bh6+ 2.Kb1
00:00 01.13 -1.25 1.Kb1
00:00 02.00 -1.97 1.Kb1 Nd7
00:00 02.01 -1.89 1.h4 Nd7
00:00 02.06 -1.62 1.Qd2 Bxf5
00:00 02.31 -1.62 1.Bxf7+
00:00 02.31 -0.98 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Kg7 (0)
00:00 03.00 0.72 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Kxf5 4.h3 Bh6+ (0)
00:00 04.00 -0.66 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Kxf5 4.Rd4 Kg6 5.Rd2 (0)
00:02 05.00 0.54 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Kxf5 4.Qd2 Bc5 5.Qg5+ Kxe4 6.Rd3
Be6 (1)
00:10 06.00 -0.97 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Kxf5 4.Kb1 Bh6 5.Rd4 Kg6 6.Rc4 (6)
00:55 07.00 -1.76 1.Bxf7+ Kxf7 2.Qf3 Bh6+ 3.Kb1 Kf8
4.Qh5 Be3 5.Rd3 Rg8 (44)
00:57 07.02 -1.55 1.Kb1 Bh6 2.Ne4 O-O 3.Nxf2 Re8 4.Rhg1+
Kh8 (56)
01:12 08.00 -2.77 1.Kb1 Nc6 2.Bb3 Nd4 3.Qg3 f1=Q 4.Rhxf1
01:38 08.01 -2.77 1.Bxf7+
02:58 08.01 -1.04 1.Bxf7+ Kxf7 2.Qf3 h5 3.Qd5+ Ke8
4.f7+ Ke7 5.Rhf1 Bh6+ 6.Kb1 Kf8
7.Qd8+ Qxd8 8.Rxd8+ (98)
07:11 09.00 -1.41 1.Bxf7+ Kxf7 2.Qf3 h5 3.Qd5+ Ke8
4.f7+ Ke7 5.f6+ Kxf6 6.Rdf1 Bh6+
7.Kb1 Qxf7 8.Rxf2+ Bf4 (197)
12:26 09.07 -1.32 1.Nd5 Qd6 2.Qe3 Nd7 3.Nb6 Qxf6 4.Nxd7
22:48 10.00 -1.87 1.Nd5 Qd6 2.Qe3 Bxf5 3.Qg5 Be6 4.Qg7+
Qxd5 (969)
25:42 10.01 -1.87 1.Bxf7+
45:15 10.01 -0.90 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Ke7 4.f6+ Ke8 5.f7+ Ke7 6.Qd2 Qc6
7.Qg5+ Kxf7 (1542)
25:21 11.00 -0.81 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Ke7 4.f6+ Ke8 5.f7+ Ke7 (2957)
41:03 12.00 -1.14 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Ke7 4.Nd6 (6395)
The Q5T seems to agree that 17. ..Ke7 is a better move than 17. ..Kxf5. -1.14 so
probably Black should be able to hold it, at least that is what Q5T thinks. The
line at three plies deep, 00:00 03.00 0.72 1.Bxf7+ Kxf7 2.Qd5+ Kxf6 3.Ne4+
Kxf5 4.h3 Bh6+ (0) seems also to indicate also that Ke7 is not so good... :)
Just kidding a three ply evaluation is of course not very reliable and moreover
moves further down the line are even less reliable in computer given lines.
Lots of fail highs and fail lows in the analysis so interesting position. The
twelve ply iteration took already very long, lots of extensions and I'm getting
curious what Rebel's new null-move search would make of this.
It would be easier to test things in ECTool but there is not yet a Rebel 3
version available for that.
Eelco
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