Author: Mark Young
Date: 12:24:56 03/19/99
Go up one level in this thread
On March 19, 1999 at 14:36:48, blass uri wrote:
>
>On March 19, 1999 at 13:49:07, Mark Young wrote:
>
>>On March 19, 1999 at 12:48:04, Bruce Moreland wrote:
>>
>>>5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - - 0 1
>>>
>>>The key is 1. Rd8, which Kasparov didn't find.
>>>
>>>It isn't hard to find for a computer, but I think they will typically think it
>>>is a draw. Can anyone find a score that indicates *significant* advantage to
>>>white?
>>
>>Hiarcs7 has a nice + score for this position for the start. Here is Hiarcs7 line
>>after about 30 secs on a P II 400.
>>
>>10->30 27 1487kN d2-d8 f8xd8 b5-d5 a4-d4 d5xd4 e3xd4 c6xa6 g8-f8 = 309
>>
>>Hiarcs 7 score only increased as it searched deeper, and the line was almost the
>>same.
>>
>>>
>>>What this means in practice is, can anyone resolve (hopefully from the root) the
>>>near-perpetual after:
>>>
>>>1. Rd8 Qxb5 2. Qd6 Bxf2+ 3. Kxf2 Qf5+
>>
>>Hiarcs 7 scored the position after this line at +593
>
>The question is if it scored it at +593 for the correct reason because I saw a
>case in the ssdf games when Hiarcs7 scored a repetition line as positive.
>
>Fritz5.32 did a draw against Hiarcs7 because of this reason.
This is hard to show one way or the other, so I let Hiarcs7 autoplay the
position to see if it could win as white. It did, and here is the game and
scores.
PII 400, Level: 15 sec a move/avg.
[Event "autoplay"]
[Site ""]
[Date "1999.03.19"]
[Round ""]
[White "HIARCS"]
[Black "HIARCS"]
[Result "*"]
[FEN "5rk1/5ppp/p1Q1p3/1R6/q7/4b1P1/P2RPP1P/6K1 w - -"]
{H701: 65472Kb, <3000589a>}
1. Rd8 {H7: 11 1.Rd8 Rxd8 Rd5 Qd4 Rxd4 Bxd4 Qxa6 Bc3 Qb6 Rd1+ Kg2 Bf6 a4
Bd8 = 329}
1... Qxb5 {H7: 08 1...Rxd8 Rd5 = -342}
2. Qd6 {H7: 07 2.Qd6 Bxf2+ = 482}
2... Bxf2+ {H7: 08 2...Bxf2+ Kxf2 Qf5+ Kg1 Qb1+ Kg2 Qe4+ Kh3 Qf5+ g4 Qf1+
Kg3 Qg1+ Kf3 Qf1+ Ke3 = -463}
3. Kxf2 {H7: 10 3.Kxf2 Qf5+ Kg1 Qb1+ Kg2 Qe4+ Kh3 Qf5+ g4 Qf1+ Kg3 Qg1+ =
463}
3... Qf5+ {H7: 09 3...Qf5+ Kg1 Qb1+ Kg2 Qe4+ Kh3 Qf5+ g4 Qf1+ Kg3 Qe1+ Kf3
Qf1+ Ke3 Qc1+ Kf2 Qc5+ Qxc5 = -563}
4. Kg1 {H7: 12 4.Kg1 h6 = 600}
4... Qb1+ {H7: 12 4...Qb1+ Kg2 Qe4+ = -633}
5. Kg2 {H7: 12 5.Kg2 Qe4+ = 633}
5... Qe4+ {H7: 11 5...Qe4+ Kh3 Qf5+ = -624}
6. Kh3 {H7: 11 6.Kh3 Qf5+ = 624}
6... Qf5+ {H7: 09 6...Qf5+ g4 Qf1+ Kg3 Qg1+ = -633}
7. g4 {H7: 10 7.g4 Qf1+ Kg3 Qg1+ = 633}
7... Qf1+ {H7: 10 7...Qf1+ Kg3 Qg1+ = -633}
8. Kg3 {H7: 12 8.Kg3 Qg1+ = 0}
8... Qe1+ {H7: 09 8...Qe1+ Kf3 Qf1+ Ke3 Qh3+ Kd4 Qxg4+ Kc3 h5 Rxf8+ Kh7
Rxf7 Qxe2 Qg3 Qg4 Qxg4 hxg4 = -633}
9. Kf3 {H7: 09 9.Kf3 Qf1+ Ke3 Qh3+ Kd4 = 609}
9... Qf1+ {H7: 08 9...Qf1+ Ke3 Qh3+ Kd4 Qxg4+ Kc3 h5 Rxf8+ Kh7 Rxf7 Qxe2
Qg3 Qg4 Qxg4 hxg4 = -630}
10. Kg3 {H7: 09 10.Kg3 Qe1+ = 633}
10... Qe1+ {H7: 10 10...Qe1+ Kf3 = 0}
11. Kf3 {H7: 11 11.Kf3 Qf1+ = 0}
11... Qf1+ {H7: 08 11...Qf1+ Ke3 Qh3+ Kd4 Qxg4+ Kc3 h5 Rxf8+ Kh7 Rxf7 Qxe2
Qg3 Qg4 Qxg4 hxg4 = -630}
12. Ke3 {H7: 09 12.Ke3 Qh3+ Kd4 Qxg4+ Kc3 h5 Rxf8+ Kh7 Rxf7 Qxe2 Qg3 Qg4
Qxg4 hxg4 = 630}
12... Qc1+ {H7: 09 12...Qc1+ Kf2 Qf4+ Qxf4 Rxd8 Qc7 Rf8 Qb6 Ra8 Qc6 Rd8 Qxa6
= -693}
13. Kf2 {H7: 10 13.Kf2 Qf4+ Qxf4 Rxd8 Qc7 Rf8 Qb6 a5 Qxa5 f5 g5 Rc8 = 702}
13... Qf4+ {H7: 10 13...Qf4+ Qxf4 Rxd8 Qc7 Rf8 Qb6 a5 Qxa5 f5 gxf5 exf5 Qd5+
Kh8 a4 = -711}
14. Qxf4 {H7: 07 14.Qxf4 Rxd8 Qc7 Rf8 Qa7 f5 g5 = 670}
14... Rxd8 {H7: 11 14...Rxd8 Qc7 Rf8 Qb6 a5 Qa6 h6 = -731}
15. Qc7 {H7: 11 15.Qc7 Rf8 Qc6 a5 Qa6 a4 Qxa4 h6 Qd7 Ra8 a4 = 763}
15... Rf8 {H7: 10 15...Rf8 Qb6 a5 Qxa5 f5 gxf5 exf5 Qd5+ Kh8 a4 f4 = -730}
*
I stop the game at this point because it is an easy win for white.
>
>Uri
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.