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Subject: Re: king and pawns ending

Author: Vincent Diepeveen

Date: 10:43:07 08/23/02

Go up one level in this thread


On August 23, 2002 at 11:19:21, John Merlino wrote:

>On August 23, 2002 at 09:35:40, Frank Phillips wrote:
>
>>[D]7k/7p/8/8/1pP2P2/p7/3K4/8 w - -
>>
>>I would be interested in your static score for the above position and how your
>>search responds.
>
>Chessmaster cannot report a static evaluation, but it takes 10 seconds to see
>that White is winning on my PIII-733:
>
>Time	Depth	Score	Positions	Moves
>0:00	5/9	-4.85	26490		1.Kc1 Kg7 2.c5 Kf6 3.c6 a2 4.Kb2
>					Ke6 5.c7 a1=Q+ 6.Kxa1 Kd7 7.Kb2
>					h5 8.Kb3
>0:00	5/9	-3.89	31384		1.Kc2 Kg7 2.c5 a2 3.Kb2 a1=Q+ 4.Kxa1
>					Kf6 5.Kb2 h5 6.Kb3 h4 7.Kxb4 h3
>					8.c6 Ke6
>0:00	6/10	-5.16	51244		1.Kc2 Kg7 2.c5 Kf7 3.c6 Ke8 4.f5
>					a2 5.Kb2 h5 6.Kxa2 Ke7
>0:01	7/11	-4.91	90504		1.Kc2 Kg7 2.c5 Kf7 3.c6 Ke8 4.f5
>					a2 5.Kb2 h5 6.Kxa2 Ke7 7.c7
>0:02	8/12	-4.28	240157		1.Kc2 Kg7 2.c5 Kf7 3.c6 Ke7 4.f5
>					a2 5.f6+ Kxf6 6.c7 a1=Q 7.c8=Q
>					Qa2+ 8.Kd3 b3 9.Qc6+ Kg5
>0:07	9/13	-0.07	664019		1.Kc2 Kg7 2.c5 Kf7 3.c6 Ke7 4.f5
>					b3+ 5.Kxb3 Kd6 6.f6 a2 7.f7 a1=Q
>					8.f8=Q+ Kxc6 9.Qh6+ Kc5 10.Qxh7
>0:10	9/13	1.81	979288		1.Kc1 Kg7 2.c5 Kf7 3.c6 Ke8 4.f5
>					b3 5.f6 a2 6.Kb2 h5 7.c7 Kd7 8.c8=Q+
>					Kxc8 9.f7
>0:12	10/14	2.87	1198652		1.Kc1 Kg7 2.c5 Kf7 3.c6 Ke8 4.f5
>					b3 5.f6 b2+ 6.Kc2 a2 7.Kxb2 h5
>					8.c7 Kd7 9.c8=Q+ Kxc8 10.f7
>0:18	11/15	5.14	1714965		1.Kc1 Kg7 2.c5 Kf7 3.c6 Ke7 4.f5
>					h5 5.f6+ Kxf6 6.c7 Ke5 7.c8=Q Kd4
>					8.Qd7+ Kc3 9.Qd2+ Kc4 10.Qa2+ Kd4
>
>>My static score favours white.  The search initially favours black, but then
>>recognises white is winning.
>>
>>(In the actually game the search did not see the danger in time and playing
>>Rxd2+
>>[D]3r3k/7p/8/8/ppP2P2/8/3BK3/8 b - -).
>
>Chessmaster 9000 avoids Rxd2 in one second:
>
>Time	Depth	Score	Positions	Moves
>0:00	1/3	-6.46	1009		1...Rxd2+ 2.Kxd2 a3 3.Kc1 a2 4.Kb2
>0:00	1/4	-5.63	1302		1...Rxd2+ 2.Kxd2 a3 3.Kc1 a2 4.Kb2
>					a1=Q+ 5.Kxa1 Kg7
>0:00	1/5	-5.65	3348		1...Rxd2+ 2.Kxd2 a3 3.Kc1 a2 4.Kb2
>					Kg7 5.Kxa2 h5
>0:00	2/6	-5.77	10463		1...Rxd2+ 2.Kxd2 a3 3.Kc1 Kg7 4.c5
>					a2 5.Kb2 Kf6 6.Kxa2 h5
>0:00	3/7	-5.22	23231		1...Rxd2+ 2.Kxd2 a3 3.Kc1 Kg7 4.c5
>					a2 5.Kb2 Kf6 6.c6 a1=Q+ 7.Kxa1 Ke6
>0:00	4/8	-4.78	49810		1...Rxd2+ 2.Kxd2 a3 3.Kc1 Kg7 4.c5
>					a2 5.Kb2 Kf7 6.c6 Ke8 7.c7 a1=Q+
>					8.Kxa1 Kd7
>0:01	4/8	-4.93	73815		1...Rb8 2.Kd3 a3 3.Bc1 Kg7 4.c5
>					Rc8 5.Kc4
>0:02	5/9	-5.21	163159		1...Rb8 2.Kd3 Kg8 3.Bc1 Rd8+ 4.Ke4
>					a3 5.c5 Rd1 6.Be3 b3
>0:05	6/10	-5.81	427032		1...Rb8 2.Kd3 Kg8 3.c5 b3 4.Bc3
>					b2 5.Bxb2 Rxb2 6.c6 Rb1 7.c7 Rc1
>0:10	7/11	-6.03	891322		1...Rb8 2.Kd3 Kg8 3.Bc1 Rd8+ 4.Ke2
>					a3 5.c5 Rc8 6.Be3 a2 7.Bd4 Rxc5
>					8.Bxc5 a1=Q 9.Bxb4
>0:32	8/12	-6.01	2820852		1...Rb8 2.Bc1 Kg8 3.f5 a3 4.Kd3
>					Ra8 5.c5 a2 6.Bb2 a1=Q 7.Bxa1 Rxa1
>					8.c6 Kf7
>1:16	9/13	-6.13	6854224		1...Rb8 2.Bc1 Kg8 3.f5 Kf7 4.c5
>					Rc8 5.Be3 Kf6 6.Kd3 Kxf5 7.Bd4 a3
>
>jm

Need 6 ply to see rxd2 isn't the best.

00:00    140   0k 0 0 7 (2) 1 (0,1) 2.312 Rd8xd2 Ke2xd2
00:00    175   0k 0 0 14 (2) 1 (0,1) 6.613 b4-b3
00:00    415   0k 0 0 54 (2) 2 (0,3) 4.663 b4-b3 Bd2-c3 Kh8-g8
++ d8-e8
00:00    360   0k 0 0 72 (2) 2 (0,7) 4.719 Rd8-e8 Ke2-d3
00:00   1084   1k 0 0 271 (2) 3 (0,23) 4.430 Rd8-e8 Ke2-d3 b4-b3 Bd2-c3 Kh8-g8
++ b4-b3
00:00   1090   1k 0 0 338 (2) 3 (0,27) 4.663 b4-b3 Bd2-c3 Kh8-g8
++ d8-d2
00:00    887   1k 0 0 364 (2) 3 (0,29) 5.917 Rd8xd2 Ke2xd2 a4-a3
++ a4-a3
00:00   1383   1k 0 0 678 (2) 3 (0,40) 6.593 a4-a3 Bd2xb4 a3-a2
00:00   1750   2k 0 0 928 (2) 4 (1,50) 2.876 a4-a3 Bd2xb4 Rd8-e8 Ke2-d3
++ b4-b3
00:00   1978   2k 0 0 1207 (2) 4 (2,57) 4.807 b4-b3 Bd2-c3 Kh8-g8 Bc3-f6 Rd8-c8

++ d8-e8
00:00   2480   2k 0 0 1935 (2) 4 (3,67) 5.888 Rd8-e8 Bd2-e3 a4-a3 Ke2-d3
00:00   5085   5k 0 0 4221 (2) 5 (10,120) 4.600 Rd8-e8 Ke2-d3 b4-b3 Bd2-c3 Kh8-g
8 Bc3-b2 Re8-f8
++ d8-d2
00:00   5743   6k 0 0 5456 (2) 5 (16,150) 8.892 Rd8xd2 Ke2xd2 a4-a3 c4-c5 a3-a2

00:01   7349   7k 0 0 7937 (2) 6 (17,189) 3.182 Rd8xd2 Ke2xd2 h7-h5 Kd2-c2 h5-h4
 c4-c5 b4-b3 Kc2-b2
++ d8-e8
00:01  10663  11k 0 0 13010 (2) 6 (23,227) 4.276 Rd8-e8 Ke2-d3 b4-b3 Bd2-c3 Kh8-
g8 Bc3-b2 Kg8-f7 f4-f5
++ b4-b3
00:01  12794  13k 0 0 17785 (2) 6 (39,278) 4.826 b4-b3 Bd2-c1 h7-h5 Ke2-e3 Rd8-c
8 Bc1-b2 Kh8-h7
++ d8-b8
00:01  14831  15k 0 0 22692 (2) 6 (46,326) 5.245 Rd8-b8 Bd2-e3 a4-a3 Be3-d4 Kh8-
g8 Bd4-e5 Rb8-c8
00:01  19708  20k 0 0 33899 (2) 7 (70,425) 6.297 Rd8-b8 Ke2-d3 a4-a3 Bd2-e3 Rb8-
d8 Be3-d4 Rd8xd4 Kd3xd4
00:02  44155  44k 0 0 95375 (2) 8 (100,577) 6.458 Rd8-b8 Bd2-c1 a4-a3 Ke2-d2 Rb8
-g8 Kd2-d3 Rg8-d8 Kd3-c2 Rd8-a8 Kc2-b1 b4-b3
00:02  78935  79k 0 0 234438 (2) 9 (128,753) 7.059 Rd8-b8 Bd2-c1 a4-a3 Ke2-d3 Kh
8-g7 Kd3-c2 b4-b3 Kc2-b1 b3-b2 Bc1-e3
00:04 114204 114k 0 0 552751 (2) 10 (162,970) 6.713 Rd8-b8 Bd2-c1 a4-a3 Ke2-d3 K
h8-g7 f4-f5 Kg7-f6 Kd3-c2 h7-h5 Kc2-b3 Kf6xf5
00:09 186791 187k 0 0 1705407 (2) 11 (295,1614) 7.284 Rd8-b8 Ke2-d1 a4-a3 Kd1-c1
 b4-b3 Bd2-c3 Kh8-g8 c4-c5 b3-b2 Bc3xb2 a3xb2 Kc1-b1
00:24 256625 257k 0 0 6179546 (2) 12 (498,2614) 7.066 Rd8-b8 Bd2-c1 a4-a3 Ke2-d3
 Rb8-g8 c4-c5 Rg8-g1 Kd3-c2 h7-h5 Bc1-d2 Rg1-g2 Kc2-d3 b4-b3
00:42 278184 278k 0 0 11914623 (2) 13 (601,3286) 8.188 Rd8-b8 Bd2-c1 a4-a3 Ke2-d
3 Rb8-c8 Kd3-d4 Rc8-e8 Kd4-d3 Re8-e1 Kd3-c2 h7-h5 Kc2-b3 Re1xc1 Kb3xb4




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