Author: blass uri
Date: 19:59:55 03/20/99
Go up one level in this thread
On March 19, 1999 at 15:24:56, Mark Young wrote:
>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, }
>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}
This is exactly my point
Hiarcs7 evaluated a repetition line with positive evaluation
Ke3 is winning but Hiarcs7 prefered to win more slowly because second repetition
has positive evaluation.
It only evaluates third repetition as draw but it seem never to calculate the
third repetition because it evaluated the second repetition as winning.
Uri
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