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Subject: Re: Mate in 14 and the aesthetics of EGTBs

Author: Mogens Larsen

Date: 14:06:58 08/11/02

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On August 11, 2002 at 16:01:52, Dieter Buerssner wrote:

>I already showed Yace analysis with TBs. Now without TBs, 40M hash, k6-2 475.
>Yace finds a mate (also longer) in about the same time as CM. Considering the
>hardware difference, one could argue, that it is faster than CM:
>
>  25686694  2:12.4  19.65 15.  78...Kf1 79.Kc3 Ke1 80.Re8+ Re2 81.Rd8 g2
>                               82.Kc4 g1=Q 83.Rd3 Re5 84.Rxd2 Kxd2 85.Kb3 Qg4
>                               86.Ka3 Kc2 {HT} {1501}
>  30384498  2:38.4  20.05 16++ 78...Kf1 79.Kc3 Ke1 80.Re8+ Re2 81.Rd8 g2
>                               82.Kc4 g1=Q 83.Rd3 d1=Q 84.Rd5 Rc2+ 85.Kb4
>  33680778  3:01.1  21.05 16++ 78...Kf1 79.Kc3 Ke1 80.Rb8 d1=Q 81.Rb3
>  41249622  3:44.1  26.05 16++ 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Rd3 g1=Q
>                               82.Kb4 d1=Q 83.Rb3
> 102781545  9:47.4  Mat16 16t  78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rxd1+ Kxd1
>                               82.Kc5 g2 83.Kd5 g1=Q 84.Ke4 Qg5 85.Kd3 {HT}
>                               {1501}
> 114072584 10:39.9  Mat16 16.  78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rxd1+ Kxd1
>                               82.Kc5 g2 83.Kd5 g1=Q 84.Ke4 Qg5 85.Kd3 {HT}
>                               {1501}
> 277618724 25:40.7  Mat13 17t  78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rd4 Qxd4+
>                               82.Kxd4 g2 83.Ke4 g1=Q 84.Kd4 Qg5H 85.Kc3H {HT}
>                               {1501}
> 302854644 27:33.8  Mat13 17.  78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rd4 Qxd4+
>                               82.Kxd4 g2 83.Ke4 g1=Q 84.Kd4 Qg5 85.Kc3 {HT}
>                               {1501}

Green Light Chess 2.18 with 48MB on my P3-866MHz isn't too slow either:

D10  00:01  10,23   Kf3 2. Kc3 g2 3. Rd3+ Ke4 4. Rd4+ Ke5 5. Rxd2 Rxd2 6. Kxd2
g1=Q 7. Kd3 Qd4+ 8. Ke2 Qe4+ 9. Kd2
D11  00:02  10,24   Kf3 2. Kc3 g2 3. Rd3+ Ke4 4. Rd4+ Ke5 5. Rxd2 g1=Q 6. Rxf2
Qxf2 7. Kd3 Qd4+ {ht}
D11  00:02  10,63   Kf1 2. Kc5 g2 3. Kb4 g1=Q 4. Ka3 {++}
D11  00:06  15,65   Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 d1=Q 5. Rxd1+ Kxd1 6. Kd3
g2 7. Kc4 g1=Q
D12  00:06  15,77   Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 d1=Q 5. Rxd1+ Kxd1 6. Kd3
g2 7. Kc4 g1=Q 8. Kc3 Qc5+ 9. Kd3
D13  00:08  15,80   Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 d1=Q 5. Rxd1+ Kxd1 6. Kd3
g2 7. Kc4 g1=Q 8. Kd5 Rd2+ {ht}
D14  00:11  15,83   Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 d1=Q 5. Rxd1+ Kxd1 6. Kd3
g2 7. Kc4 g1=Q 8. Kd5 Qg5+ 9. Kd4 Qe5+ 10. Kc4 Re3
D15  00:15  16,23   Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 d1=Q 5. Rxd1+ Kxd1 6. Kd3
g2 7. Kc4 g1=Q 8. Kd5 Qb6 9. Kc4 Re4+ 10. Kd5 Qe6+ 11. Kc5 Rc4+ 12. Kb5 Qc6+ 13.
Ka5 Ra4# {++}
D15  02:04  M13  Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 g2 5. Kc4 g1=Q 6. Rd3 d1=Q 7.
Rxd1+ {ht}
D16  02:19  M13  Kf1 {--}
D16  03:17  M13  Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 g2 5. Kc4 g1=Q 6. Rd3 d1=Q 7.
Rxd1+ Kxd1 {ht} {++}
D16  04:32  M12  Kf1 2. Kc3 Ke1 3. Re8+ Re2 4. Rd8 g2 5. Kc4 g1=Q 6. Rd3 d1=Q 7.
Rxd1+ Kxd1 8. Kd5 Qb6 9. Kc4 Rd2 10. Kc3 Qd4+ 11. Kb3 Rb2+ 12. Ka3 Qb4#

Regards,
Mogens



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