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Subject: Re: Testposition:12..Nxe5, 12..Nc6, or 12..Bc5?

Author: Eelco de Groot

Date: 23:56:28 03/29/05

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Thanks all for your comments so far! Much appreciate it. Glad that the computers
also are not all sure about the precise outcome of the battle.

Here is some Ruffian 1.05 analysis, and that makes me suspect that S&D 6_7e3 may
need some repair work, for choosing 12..Bc5. I ordered a copy of Gandalf 6, so
probably later this week I'll be able to show you what the wizard has to say
about it. Thanks!

 Eelco

Ruffian 1.05, Celeron 500 MHz, choosing 12..Nc6 slightly below drawscore, -0.08:

00:00:01.1	5,01	6	182778	Be7 Nf3 Qa5 Kf1 f5 exf6ep Bxf6 hxg6
00:00:01.5	4,66	7	262638	Be7
00:00:01.6	3,69	7	292935	Be7 hxg6 hxg6 Bxg6 fxg6 Nxe6 Qa5 Nxf8 Kxf8
00:00:04.0	3,42	8	815072	Be7 Nxh7 Bh4+ Kf1 Kxh7 Qg4 Kg7 Rxh4 Rh8
00:00:05.9	3,07	9	1267398	Be7
00:00:10.3	2,57	9	2287363	Be7 hxg6 Bxg5 Qh5 h6 g7 Kxg7 fxg5 Kg8 gxh6 Nc6 Bf4
00:00:20.2	2,22	10	4516147	Be7
00:00:25.5	1,02	10	5704326	Be7 hxg6 Bxg5 Qh5 h6 g7 Kxg7 fxg5 Rh8 gxh6+ Kf8 O-O
Qb6+ Rf2
00:00:57.9	1,39	10	13009086	Nc6 hxg6 fxg6 Nxh7 Ne7 Qg4 Rf5 Kd1 Qa5 Bxf5 exf5 Qg5
00:01:45.3	1,90	10	24010377	Nxe5 fxe5 Qc7 Nf3 Nd7 a3 Be7 Bh6 Nxe5
00:02:04.6	1,55	11	28463213	Nxe5
00:02:34.4	0,02	11	35391338	Nxe5 fxe5 Qc7 Qg4 Nc6 Nxh7 Nxe5 Nf6+ Kg7 h6+ Kh8
Qxb4 Nxd3+ cxd3 Qg3+ Ke2 Qxg2+
00:02:46.8	0,55	11	38377150	Be7 hxg6 fxg6 Nxh7 Bh4+ Kf1 Nxe5 Nxf8 Nxd3 Qxd3 Kxf8
g3 Bf6 Qxg6
00:04:01.0	1,11	11	56417572	Nc6 hxg6 hxg6 Qg4 Nf6 exf6 Qxf6 Nh7 Qh8 Qh4 Be7 Qh6
00:05:31.0	1,25	11	77957139	Nf6 exf6 Qxf6 hxg6 hxg6 Qg4 Qg7 Be3 e5 f5 d4 Rh7
00:05:49.3	0,90	12	82239409	Nf6
00:06:41.0	-1,25	12	95546375	Nf6 exf6 e5 Nxh7 e4 Bb5 a6 Nxf8 axb5 Nxg6 fxg6 hxg6
Nc6
00:07:45.4	0,00	12	111160850	Nxe5 fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8
g7 Qxg7 Bh7+ Kh8 Bg6+ Kg8 Bh7+
00:08:22.4	0,45	12	120166807	Be7 hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qf3 Nc5
Qxd5+ Be6 Qd4
00:09:04.2	0,80	12	130112227	Nc5 hxg6 fxg6 Nxh7 Nxd3+ Qxd3 Kg7 Nxf8 Qxf8 a3 Bc5
b4 Bb6 Qxc3 Kg8
00:10:29.3	1,19	12	151719135	Nc6 hxg6 fxg6 Nxh7 Qe8 Nxf8 Nxf8 Qg4 Be7 Rh6 Kg7
Rh1 Kg8
00:12:53.2	0,84	13	186105938	Nc6
00:14:19.8	0,61	13	209125709	Nc6 hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qh3 Qe7 a3
Ba5 Qh6
00:31:27.7	0,67	14	462460579	Nc6 hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qh3 Be7 a3
d4 Qh6 Nc5
00:52:06.0	0,32	15	763230783	Nc6
01:04:57.3	0,26	15	958450523	Nc6 hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qh3 Kf7 a3
Bc5 b4 Bd4 Qh6
02:27:18.9	-0,09	16	-2130195867	Nc6
02:49:17.8	-0,08	16	-1789844732	Nc6 hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Ng5 Rxg5 Qxg5 Nf8
Qh6 Kf7 a3 Be7 Qh8 Nd4

and after 12..Nxe5 (scores are for the side to move, White slightly ahead):

00:00:00.6	-2,08	1	4	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+
00:00:00.7	-2,22	2	252	fxe5 h6 hxg6
00:00:00.7	-2,13	3	5692	fxe5 h6 Qg4
00:00:00.7	-1,96	4	7087	fxe5 h6 Nf3 g5
00:00:00.7	-1,33	5	9817	fxe5 h6 Nf3 g5 O-O
00:00:00.7	-1,70	6	24854	fxe5 h6 Nf3 g5 O-O f6
00:00:00.7	0,00	7	70657	fxe5 h6 hxg6 hxg5 Rh8+ Kg7 Rh7+ Kg8 Rh8+
00:00:01.1	0,00	8	159970	fxe5 h6 hxg6 hxg5 Rh8+ Kg7 Rh7+ Kg8 Rh8+
00:00:02.3	0,00	9	509577	fxe5 Be7 hxg6 Bxg5 g7 Kxg7 Rxh7+ Kg8 Rh8+ Kg7 Rh7+
00:00:04.5	0,00	10	1126368	fxe5 Be7 hxg6 Bxg5 g7 Kxg7 Rxh7+ Kg8 Rh8+ Kg7 Rh7+
00:00:46.8	0,00	11	11493218	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8 g7
Qxg7 Bh7+ Kh8 Bg6+ Kg8 Bh7+
00:01:40.6	0,00	12	24719099	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8 g7
Qxg7 Bh7+ Kh8 Bg6+ Kg8 Bh7+
00:04:39.9	0,35	13	68836554	fxe5
00:08:49.6	0,89	13	127425073	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8
gxf7+ Kxf7 Bf4 Qxf4 Qxf4+ Ke8 Bg6+ Kd8 Bf7
00:10:07.7	0,54	14	150183886	fxe5
00:15:39.2	0,39	14	231382950	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8 Bf4
Qg7 Rh7 e5 Rxg7+ Kxg7 Bxe5+ Nxe5 Qxb4 Nxd3 cxd3
00:33:13.5	0,39	15	504163820	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8
gxf7+ Kxf7 Bf4 Qg7 Rh7 Qxh7 Bxh7 e5 Qg6+ Ke7 Qg5+ Kd6
01:23:09.0	0,74	16	1244264799	fxe5
02:00:43.3	0,83	16	1800242295	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8
gxf7+ Kxf7 Bf4 Qg7 Rh7 Qxh7 Bxh7 Ke8 Bg6+ Kd8 Kc1
04:10:15.7	0,51	17	-444169429	fxe5 Qc7 Qg4 Nc6 Nxh7 Qxe5+ Kd1 Kxh7 hxg6+ Kg8
gxf7+ Kxf7 Bf4 Qg7 Rh7 Qxh7 Bxh7 Ke8 Bg6+ Kd8 Kc1 e5

After 12..Bc5

00:00:00.1	-4,75	1	5	hxg6 hxg6 Bxg6 fxg6 Nxe6
00:00:00.2	-4,44	2	234	hxg6 hxg6 Rh7
00:00:00.2	-4,62	3	3574	hxg6 hxg6 Nxe6 fxe6 Bxg6
00:00:00.2	-3,94	3	4529	Nxh7 Kxh7 hxg6+ Kg8 gxf7+ Kg7
00:00:00.2	-3,60	4	7128	Nxh7 Kxh7 hxg6+ Kg8 gxf7+ Kxf7 Qg4
00:00:00.4	-2,00	5	47297	Nxh7 Qb6 hxg6 Bf2+ Kf1 fxg6 Bxg6
00:00:00.8	-1,25	6	130827	Nxh7 g5 Nxf8 Qxf8 h6 Nc6 Qh5
00:00:01.2	-1,28	7	235754	Nxh7 g5 Nxf8 Qxf8 h6 Nc6 Qh5 Qd8
00:00:02.4	-1,08	8	516394	Nxh7 g5 Nxf8 Qxf8 h6 Nc6 Qg4 Be7 Qh5
00:00:07.1	-1,17	9	1621772	Nxh7 g5 h6 Nc6 Qh5 Nb4 Nxf8 Nxd3+ cxd3 Qxf8 Qxg5+ Kh8
00:00:15.9	-0,88	9	3778148	hxg6 fxg6 Nxh7 Qe8 Rh6 Rf5 Bxf5 gxf5 Qd3 Bb4
00:00:24.6	-0,68	10	5903094	hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qh3 Bd4 Qh6
00:00:48.9	-0,44	11	11994560	hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qh3 Qe7 Qxc3
Qe6
00:01:34.4	-0,09	12	23385210	hxg6
00:02:37.1	0,04	12	40022109	hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qh3 Kf7 Qxc3
Ke7 Nf6
00:08:36.0	-0,15	13	117671153	hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Bxf5 exf5 Qh3 Be7 Qxc3
Nf6 Nxf6+ Bxf6 Be3 Be7
00:20:24.3	0,10	14	294176611	hxg6 fxg6 Nxh7 Qe8 Qg4 Rf5 Ng5 Nxe5 fxe5 Nc6 Bxf5
exf5 Qh4 Qxe5+ Kd1 Qd4+ Qxd4 Bxd4 Rh7
00:36:40.4	0,45	15	553472626	hxg6
01:24:29.7	1,63	15	1292162215	hxg6 fxg6 Nxh7 Nxe5 fxe5 Nc6 Nxf8 Qxf8 Qe2 Qg7 Bf4
Bd4 O-O-O Bxe5 Bh6 Qxh6+ Rxh6 Bf4+ Kb1 Bxh6 Bxg6
02:59:47.0	1,63	16	-1546302704	hxg6 fxg6 Nxh7 Nxe5 fxe5 Nc6 Nxf8 Qxf8 Qe2 Qg7
Bf4 Bd4 O-O-O Bxe5 Bh6 Qxh6+ Rxh6 Bf4+ Kb1 Bxh6 Bxg6



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