Author: Dieter Buerssner
Date: 10:58:27 03/02/04
Go up one level in this thread
On March 02, 2004 at 09:00:52, José Antônio Fabiano Mendes wrote:
> Study by Noam Elkies, 1987
> 6K1/8/1p5P/1P6/2P3n1/8/3k4/8 w
This could be considered the easiest testposition ever for Yace. It shows h7
after exactly one node and never sitches away from it:
(Yace-PB, all 5-men TBs, 300 M hash)
1 0.021 -0.03 1t 1.h7 {-180}
7 0.021 -0.03 1. 1.h7 {-180}
46 0.021 0.03 2t 1.h7 Nf6+ 2.Kg7 {-180}
69 0.021 0.03 2. 1.h7 Nf6+ 2.Kg7 {-180}
116 0.021 0.03 3t 1.h7 Nf6+ 2.Kg7 {-180}
150 0.021 0.03 3. 1.h7 Nf6+ 2.Kg7 {-180}
460 0.022 0.12 4t 1.h7 Nf6+ 2.Kg7 Ne8+ 3.Kf7 {-180}
682 0.038 0.12 4. 1.h7 Nf6+ 2.Kg7 Ne8+ 3.Kf7 {-180}
1099 0.039 0.12 5t 1.h7 Nf6+ 2.Kg7 Ne8+ 3.Kf7 {-180}
1385 0.072 0.12 5. 1.h7 Nf6+ 2.Kg7 Ne8+ 3.Kf7 {-180}
2679 0.082 1.10 6++ 1.h7 Nh6+ 2.Kg7 Nf7 3.h8=Q Ke3
2969 0.082 5.21 6++ 1.h7 Ke2 2.h8=Q Kd3H {HT}
4393 0.084 6.45 6t 1.h7 Nf6+ 2.Kg7 Ne8+ 3.Kg6H Nd6H 4.h8=QH {741}
4938 0.085 6.45 6. 1.h7 Nf6+ 2.Kg7 Ne8+ 3.Kg6 Nd6 4.h8=Q {741}
[...]
73210583 2:30.6 Mat24 15t 1.h7 Nf6+ 2.Kg7 Ne8+ 3.Kf8 Nd6 4.h8=Q Nb7
5.Qd4+ Kc1 6.Qg1+ Kc2 7.Qg2+ Kd3H 8.Qd5+H Ke3H
9.Qxb7H Kf4H 10.Qxb6H Kg3H 11.Qd4H Kh2H 12.Qb6H
Kh1H 13.Qa7H Kh2H 14.Qa4H Kg3H 15.Qc2H Kh3H
16.Qf2H {HT} {1161}
[...]
950446934 18:45.6 Mat22 17t 1.h7 Nf6+ 2.Kg7 Ne4 3.h8=Q Nc5 4.Qh3 Nd3
5.Qxd3+ Kxd3 {EGTB} 6.c5!! bxc5! 7.b6!! c4
8.b7!! c3 9.b8=Q!! Ke2! 10.Qb5+ Kd2! 11.Qa5 Kd3
12.Kg6 c2 13.Qe1! Kd4 14.Qd2+ Ke4 15.Qxc2+! Kd4
16.Kf6 Kd5 17.Qc3 Ke4! 18.Qd2! Kf3 19.Kf5! Kg3
20.Qe2! Kh3! 21.Kf4! Kh4 22.Qh2# {1001}
[...]
2226863356 44:47.1 Mat20 18t 1.h7 Nf6+ 2.Kg7 Nxh7 3.Kxh7 {EGTB} 3...Kd3
4.c5!! bxc5! 5.b6!! c4 6.b7!! c3 7.b8=Q!! Ke2!
8.Qb5+ Ke3 9.Qg5+ Ke4 10.Qh5 c2 11.Qg6+ Ke5
12.Qxc2! Kd5 13.Qc3 Ke4! 14.Qd2 Ke5 15.Kg7 Ke6
16.Qd4! Kf5! 17.Qe3 Kg4 18.Kg6 Kh4 19.Kf5! Kh5
20.Qh3# {1001}
3...Ke3 does yield in the same distance to mate:
70 0.345 Mat17 62. 4.c5 {EGTB} 4...bxc5! 5.b6!! c4 6.b7!! c3
7.b8=Q!! c2 8.Qh2!! Kd3! 9.Qh6 Kc3 10.Qc1!! Kd3
11.Kg7 Kc3! 12.Kg6 Kd3 13.Kf5! Kd4 14.Qxc2!
Kd5! 15.Qc3 Kd6 16.Qc4 Kd7! 17.Qc5 Ke8! 18.Qc7
Kf8 19.Kf6! Kg8 20.Qg7#! {1001}
Obviously, TBs help here to find the mate. But even without TBs the solution
with a decent PV is found very fast.
Regards,
Dieter
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