Author: Kolss
Date: 01:13:54 03/12/03
Go up one level in this thread
On March 11, 2003 at 17:03:41, Andrew Williams wrote:
>On March 11, 2003 at 16:45:43, Peter Berger wrote:
>
>>[D]4N3/P2k2p1/1np5/5P1p/1P1K4/8/8/8 b - - 0 1
>>
>>am Kxe8 bm h4
>>
>>It seems ..h4 draws, courtesy SCHACH MAGAZIN 64 - 5/2003 ( does anyone know who
>>did the fine IPCCC2003 report there ? ) Yace failing in the endgame means this
>>is a rather tough testposition ..
>>
>>Cheers,
>>Peter
>
>PM drops ...Kxe8 in favour of ...h4 after 30 seconds. But it doesn't see
>anything remotely resembling a draw even after 14 minutes.
>
>11= +2.68 00:00:01.34 165693 1...Kxe8 2.Kc5 Na8 3.Kd4 Kd7 4.Ke5 Kc7
> 5.Kf4 Kb7 6.Kg5 Kxa7 7.Kxh5
>12= -0.94 00:00:06.86 1006247 1...h4 2.Nxg7 h3 3.Nh5 h2 4.Ng3 Kc7
> 5.b5 cxb5 6.f6 Kb7 7.f7 Nd7
>13= +0.49 00:00:09.14 1377511 1...Kxe8 2.Kc5 Na8 3.Kxc6 h4 4.Kb7 Kd7
> 5.b5 h3 6.Kxa8 Kc8 7.b6
>14b -1.74 00:00:30.04 5138962 1...h4 2.Nxg7 h3 3.Nh5 h2 4.Ng3 Kc7
> 5.Ke5 Kb7 6.f6 Nd7 7.Ke6 Nxf6
> 8.a8=Q Kxa8 9.Kxf6
>14= -1.71 00:00:30.21 5188618 1...h4 2.Nxg7 h3 3.Nh5 h2 4.Ng3 Kc7
> 5.Ke5 Kb7 6.f6 Nd7 7.Ke6 Nxf6
> 8.a8=Q Kxa8 9.Kxf6
>15= -1.61 00:00:49.44 8602937 1...h4 2.Nxg7 h3 3.Nh5 Kc7 4.f6 Kb7
> 5.Ke5 Nd7 6.Ke6 Nxf6 7.a8=Q Kxa8
> 8.Nxf6 h2
>16= -1.65 00:01:37.84 16677348 1...h4 2.Nxg7 h3 3.Nh5 Kc7 4.Ke5 Kb7
> 5.Kd6 h2 6.Ng3 Nc4 7.Ke6 Nd2 8.f6 Ne4
> 9.f7 Ng5 10.Kf6 Nxf7 11.a8=Q Kxa8
>17= -1.77 00:04:16.98 42992030 1...h4 2.Nxg7 h3 3.Nh5 Kc7 4.Ke5 Kb7
> 5.Kd6 Nc4 6.Ke6 Nd2 7.a8=Q Kxa8
> 8.f6 Ne4 9.f7 Ng5 10.Ke7 Nxf7 11.Kxf7
>18= -1.70 00:10:12.44 108516626 1...h4 2.Nxg7 h3 3.Nh5 Kc7 4.Ke5 Kb7
> 5.b5 cxb5 6.Ke6 h2 7.Ng3 Ka6 8.f6 Kxa7
> 9.f7 h1=Q 10.Nxh1
>
>Andrew
The lines look weird - black can definitely play better, and after some
analysis, I am quite sure that SCHACH MAGAZIN's verdict on the position is
correct.
Ikarus (a slightly modified version of the one that played in Paderborn) on a
mere PIII-450MHz (64MB Hash, most 5-man TB) plays ... h4 after 3 seconds and
never returns to ... Kxe8??:
11 1 FailLow 1. ... Kxe8? 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2
6. Kb8
11 1 +1.43 1. ... Kxe8 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2
6. Kb8 h1=Q
11 3 FailHigh 1. ... h4! 2. Nxg7 h3 3. Nh5 h2 4. Ng3 Kc8 5. Ke5 Kb7
11 4 +0.71 1. ... h4 2. Nxg7 h3 3. Nh5 h2 4. Ng3 Kc8 5. Kc5 Kb7
6. Nh1 Nd5
12 7 +0.69 1. ... h4 2. Nxg7 h3 3. Nh5 h2 4. Ng3 Kc8 5. Kc5 Kb7
6. Nh1 Nd5 7. b5
13 11 FailLow 1. ... h4? 2. Nxg7 h3 3. Nh5 h2 4. Ng3 Kc8 5. Ke5 Kb7
6. f6 Kxa7 7. f7 Nd7+ 8. Kd6
13 16 +1.29 1. ... h4 2. Nxg7 h3 3. Nh5 h2 4. Ng3 Kc8 5. Ke5 Kb7
6. f6 Kxa7 7. f7 Nd7+ 8. Kd6 Nf8
14 34 +1.29 1. ... h4 2. Nxg7 h3 3. Nh5 h2 4. Ng3 Kc8 5. Ke5 Kb7
6. f6 Kxa7 7. f7 Nd7+ 8. Kd6 Nf8 9. Kxc6
15 75 +1.39 1. ... h4 2. Nxg7 h3 3. Nh5 Kc7 4. Ke5 Kb7 5. Ke6 Nd5
6. f6 Kxa7 7. f7 h2 8. Ng3 Nf4+ 9. Kf5
16 170 +1.35 1. ... h4 2. Nxg7 h3 3. Nh5 Kc7 4. Ke5 Kb7 5. f6 Nd7+
6. Ke6 Nf8+ 7. Kf7 Nh7 8. Kg7 Nxf6 9. Kxf6 Kxa7 10. Ng3
Kb6 11. Nf1
17 375 +1.29 1. ... h4 2. Nxg7 h3 3. Nh5 Kc7 4. Ke5 Kb7 5. Ke6 Kxa7
6. f6 h2 7. Ng3 Nd5 8. f7 Nf4+ 9. Kd7 Ng6 10. Kc7 Nf8
In the position after ... Kxe8??, things get worse pretty soon:
12 0 +1.42 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qc1
13 1 +1.60 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qh5 8. Kc7+ Kf7
14 2 +1.73 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qe1 8. b5 Qe3
15 3 FailHigh 2. Kc5! Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qe1 8. b5 Qe3 9. Kb7+
15 4 +2.29 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qh2+ 8. Ka7+ Ke7 9. Qd5 Qf4 10. b5
16 7 +2.54 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qh2+ 8. Ka7+ Ke7 9. Qd5 Qf4 10. Qc5+ Kf6 11. b5
17 13 +2.65 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qh2+ 8. Ka7+ Ke7 9. Qb7+ Kf6 10. b5 Qe5 11. Qc6+
Kxf5 12. b6
18 25 +2.66 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qh2+ 8. Ka7+ Ke7 9. Qb7+ Kf6 10. b5 Kxf5
11. Qd5+ Kg4 12. Qe4+ Kg5 13. b6
19 57 +2.78 2. Kc5 Na8 3. Kxc6 h4 4. Kb7 h3 5. Kxa8 h2 6. Kb8 h1=Q
7. a8=Q Qh2+ 8. Ka7+ Ke7 9. Qb7+ Kf6 10. b5 Kxf5
11. Qd5+ Kg6 12. b6 Qf2 13. Kb7
After playing out the line until the pawn promotions, I get almost +4 quickly.
Best regards, Munjong.
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