Computer Chess Club Archives


Search

Terms

Messages

Subject: Tiger14 finds Nd5 also

Author: Jorge

Date: 20:25:28 09/08/01

Go up one level in this thread


On September 08, 2001 at 03:30:21, Uri Blass wrote:

>On September 07, 2001 at 16:12:50, Aaron Gordon wrote:
>
>>While analyzing a game between Shirov and Polgar I came across this position..
>>
>>[D]rnb2bk1/1pqnr2p/p2pp1P1/6PB/4P3/2N1B3/PPP4P/R2Q1RK1 w - - 0 1
>>
>>
>>Fritz and most others keep wanting to do gxh7 but the actual move that was
>>played was Nd5 and shows a +3 pawn lead after a couple minutes of searching.
>>
>>Let me know what you guys can come up with...
>
>Junior7 on p200 needs a long time to find at depth 18 that Nd5 is 2.76 pawns
>advantage when gxh7+ is only 2.75 pawns advantage
>
>
>New position
>rnb2bk1/1pqnr2p/p2pp1P1/6PB/4P3/2N1B3/PPP4P/R2Q1RK1 w - - 0 1
>


>Analysis by Junior 7:
>
>1.gxh7+ Rxh7 2.g6 Rg7
>  +-  (1.44)   Depth: 3   00:00:00
>1.Qf3!
>  +-  (1.47)   Depth: 3   00:00:00
>  +-  (1.71)   Depth: 9   00:00:00  38kN
>1.gxh7+ Rxh7 2.Qf3 d5 3.exd5 Bc5 4.g6 Rg7 5.Rae1 Ne5 6.Qf6 exd5 7.Nxd5
>  +-  (1.90)   Depth: 9   00:00:02  295kN
>  +-  (1.90)   Depth: 12   00:00:18  2503kN
>1.Qf3 Bg7 2.gxh7+ Kh8 3.Bg6 Nc6 4.Qh5 Nce5 5.Be8 Qc4
>  +-  (2.05)   Depth: 12   00:00:21  2877kN
>  +-  (2.16)   Depth: 17   01:07:50  499508kN
>1.gxh7+ Rxh7 2.Bg6 Rh4 3.Qf3 Qd8
>  +-  (2.36)   Depth: 17   01:29:13  664289kN
>  +-  (2.75)   Depth: 18   04:28:12  2020096kN
>1.Nd5 exd5 2.Qxd5+ Kh8 3.gxh7 Rxh7 4.Bg6 Bg7 5.Bxh7 Qd8 6.Bf5 Ne5 7.Qb3 Nbc6
>8.Rad1 Bxf5 9.exf5
>  +-  (2.76)   Depth: 18   06:48:09  3096484kN
>  +-  (2.76)   Depth: 18   06:48:09  3096484kN
>
>Uri


This is ChessTiger14 variation using 96 MB Hashtable on PIII 667:

TIME		SCORE	DEPTH	NODES	VARIATION

00:00:00.0	0.76	5	43377	Qd1-f3 Kg8-h8 Be3-d4+ e6-e5 Nc3-d5 Qc7-c4
00:00:00.4	0.88	6	65530	Qd1-f3 Kg8-h8 Be3-d4+ e6-e5 Nc3-d5 Qc7-c4 Bd4-c3
00:00:01.8	1.06	7	174205	Qd1-f3 Qc7-c4 Ra1-d1 Re7-g7 g6xh7+ Kg8xh7 Bh5-f7 Kh7-h8
Qf3-h5+ Rg7-h7
00:00:02.7	0.98	8	345255	Qd1-f3 Qc7-c4 Ra1-d1 Kg8-h8 g6xh7 Re7xh7 g5-g6 Rh7-g7
Be3-d4
00:00:05.6	1.14	9	846796	Qd1-f3 Nb8-c6 g6xh7+ Re7xh7 Bh5-g6 Rh7-h4 Qf3-f7+
Kg8-h8 Rf1-f4 Rh4-h3 Qf7xe6 Rh3xe3
00:00:06.7	1.88	9	983858	Nc3-d5
00:00:07.9	1.14	9	1280062	Qd1-f3 Nb8-c6
00:00:11.4	1.18	10	1739105	Qd1-f3 Nb8-c6 g6xh7+ Re7xh7 Bh5-g6 Rh7-h4 Bg6-f7+
Kg8-h8 Bf7xe6 Bf8-g7 Qf3-f2 Rh4-h7 g5-g6
00:00:13.1	1.22	10	1957353	Nc3-d5 e6xd5 Qd1xd5+ Kg8-h8 g6xh7 Re7-g7 Be3-d4
Kh8xh7 g5-g6+ Kh7-h8 Bh5-g4 Nd7-f6 Rf1xf6
00:00:40.7	1.22	11	6155055	Qd1-f3 Bf8-g7 g6xh7+ Kg8-h8 g5-g6 Qc7-a5 Qf3-h3
Bg7xc3 b2xc3 Qa5xc3 Ra1-d1 Nd7-f6 Rd1-d3 Qc3xc2
00:01:15.5	1.28	12	12537956	Qd1-f3 Bf8-g7 g6xh7+ Kg8-h8 g5-g6 Nb8-c6 Ra1-d1
Qc7-a5 Qf3-h3 Nd7-f6 Bh5-f3 Qa5-e5 Be3-h6
00:04:03.9	1.32	12	46248901	g6xh7+ Kg8-h8 g5-g6 Bf8-g7 Qd1-d2 Nd7-f6 e4-e5 d6xe5
Bh5-f3 Nb8-c6 Nc3-e4 Nc6-d4 Ne4xf6 Bg7xf6
00:08:24.4	1.86	13	93825797	g6xh7+ Re7xh7 Bh5-g6 Rh7-h4 Qd1-f3 Qc7-d8 Bg6-f7+
Kg8-g7 Bf7xe6 Kg7-h8 Qf3-g3 Rh4-h7 g5-g6 Rh7-h5 Rf1-f7
00:08:49.8	1.98	13	97868712	Nc3-d5 e6xd5 Qd1xd5+ Kg8-h8 g6xh7 Re7xh7
00:09:43.5	1.98	13	107357712	Nc3-d5 e6xd5 Qd1xd5+ Kg8-h8 g6xh7 Re7xh7


GT2 took alot longer to find the move:


TIME		SCORE	DEPTH	NODES	EVALUATION

00:00:00.3	3.80	6	32504	gxh7+ Rxh7 g6 Rg7 Bd4 Ne5 Rf6
00:00:00.1	4.38	6	38116	gxh7+ Rxh7 Qf3 Qc4 g6 Re7 Rad1
00:00:00.2	3.94	7	61340	gxh7+ Rxh7 Qf3 Qd8 Bf7+ Kh8 g6 Ne5 Bd4 Qg5+ Kh1
00:00:01.0	4.16	8	163204	gxh7+ Rxh7 Qf3 Qd8 g6 Rg7 Bh6 Ne5 Qf2 Nxg6 Bxg7 Kxg7
Bxg6 Kxg6
00:00:05.7	4.26	9	839436	Qf3 Qd8 gxh7+ Rxh7 Bf7+ Kh8 Bxe6 Bg7 g6 Ne5 Qf5 Bxe6
Qxe6
00:00:08.6	4.14	10	1454373	Qf3 Qd8 gxh7+ Rxh7 Bf7+ Kh8 Bxe6 Bg7 g6 Ne5 Qf5 Bxe6
Qxe6
00:00:17.2	4.04	11	3310487	Qf3 Qd8 gxh7+ Rxh7 Bf7+ Kg7 Bxe6 Ne5 Qf6+ Qxf6 gxf6+
Kh8 Bxc8 Nbc6 Be6 Rh4
00:00:45.3	3.76	12	8632471	Qf3 Qd8 gxh7+ Rxh7 Bf7+ Kh8 Bxe6 Bg7 g6 Ne5 Qf5 Bxe6
Qxe6 Rh4 h3
00:01:16.5	3.80	12	14667322	gxh7+ Rxh7 Bg6 Rh4 Qf3 Qd8 Bf7+ Kh8 Qg3 Rh7 g6 Rh4
Bf2 Rh6 Bd4+ Bg7
00:03:30.3	4.18	13	41126378	gxh7+ Rxh7 Bg6 Rh4 Qf3 Qd8 Bf7+ Kg7 Bxe6 Ne5 Qf6+
Qxf6 gxf6+ Kh7 Bxc8 b5 Bf5+
00:05:11.0	4.18	13	62150995	gxh7+ Rxh7 Bg6 Rh4 Qf3 Qd8 Bf7+ Kg7 Bxe6 Ne5 Qf6+
Qxf6 gxf6+ Kh7 Bxc8 b5 Bf5+ Kh8 Rad1
00:00:00.3	3.94	7	39857	gxh7+ Rxh7 Qf3 Qd8 Bf7+ Kh8 g6 Ne5 Bd4
00:00:00.0	3.94	7	65198	gxh7+ Rxh7 Qf3 Qd8
00:00:01.3	3.74	8	143286	gxh7+ Rxh7 Qf3 Qd8 Bf7+ Kh8 g6 Ne5 Bd4 Qg5+ Kh1
00:00:02.9	4.10	9	396455	gxh7+ Rxh7 Qf3 Qd8 Bf7+ Kh8 Bxe6 Bg7 Qf5 Qf8 Qxf8+ Nxf8
Bxc8
00:00:04.6	4.10	10	849038	gxh7+ Rxh7 Qf3 Qd8
00:00:14.4	4.12	11	2800654	gxh7+ Rxh7 Qf3 Qd8 Bf7+ Kh8 Bxe6 Bg7 Qf5 Nb6 g6 Bxe6
Qxe6 Bxc3 bxc3
00:00:56.6	4.04	12	10985097	gxh7+ Rxh7 Qf3 Qd8 Bf7+ Kg7 Bxe6 Ne5 Qf6+ Qxf6 gxf6+
Kh8 Bxc8 Nbc6 Be6 Rh4 Rad1
00:03:31.0	3.70	13	41526549	gxh7+ Rxh7 Qf3 Qd8 Bf7+ Kh8 Bxe6 Bg7 Qf5 Rh4 Rad1
Qf8 Qg6 Qe7 Rf7
00:15:45.2	3.68	14	187840156	gxh7+ Rxh7 Bg6 Ne5 Nd5 exd5 Qxd5+ Rf7 Bxf7+ Kg7 g6
Bh3 Rf2 Qd7 Rf4 Qe7 Qd4 Qg5+
00:20:23.6	4.34	14	247657332	Nd5 exd5 Qxd5+ Kh8 gxh7 Rxh7 Bg6 Bg7 Bxh7 Qd8 g6
Nf6 Qg5 Bh3 Rf4
00:22:26.9	4.34	14	274412614	Nd5 exd5 Qxd5+ Kh8 gxh7 Rxh7 Bg6 Bg7 Bxh7 Qd8 g6
Nf6 Qg5 Bh3 Rf4



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.