Author: Dieter Buerssner
Date: 11:17:30 07/18/02
Go up one level in this thread
On July 18, 2002 at 09:22:00, Uri Blass wrote:
>You remember correctly and the right line is Ba3 Qxa3 Nh5+
Yace does not agree with your "right line" after some time.
K6-2 475, in the background with about 60% CPU time.
[Ba3 also found earlier with draw score]
15690097 3:02.7 0.00 11t 30. Ne2 Na5 31. Ba3 Qxa3 32. Qc7+ Kh6 33. Qf4+
Kg7 34. Qc7+ {-420}
27202864 5:19.2 0.01 11t+ 30. Ba3 Qxa3 31. Nh5+ gxh5 32. Qg5+ Kf8 33.
Qxf6+ Kg8 34. Qf7+ Kh8 35. g3 Qc1+ 36. Kg2 Qc2+
37. Kh3 Qxc3
28641052 5:34.9 0.41 11++ 30. Ba3 Qxa3 31. Nh5+ gxh5 32. Qg5+ Kf8 33.
Qxf6+ Kg8 34. Qf7+ Kh8 35. g3 Qc1+ 36. Kg2 Qc2+
37. Kh3 h6 38. Qf8+ Kh7 39. e7 Qe4 40. e8=Q h4
{501}
50280895 9:53.0 0.85 11t 30. Ba3 Qe8 31. Qc7+ Kg8 32. Be7 Ng4 33. Qxa7
Nd2 34. Bg5 Nb1 35. Qd7 Qxd7 {-991}
52940978 10:21.9 0.85 11. 30. Ba3 Qe8 31. Qc7+ Kg8 32. Be7 Ng4 33. Qxa7
Nd2 34. Bg5 Nb1 35. Qd7 Qxd7 {-991}
63514652 12:28.9 1.25 12++ 30. Ba3 Qe8 31. Qc7+ Kg8 32. Be7 Ng4 33. Qd7
Qa8 34. Bf6 Nf2 35. Kxf2 Qf8 36. e7 Kf7 {270}
80462007 16:05.7 2.25 12++ 30. Ba3 Qe8 31. Qc7+ Kg8 32. Be7 Ng4 33. Qd7
Qa8 34. Bf6 Nf2 35. Kxf2 Qf8 36. e7 Kf7 {270}
93318518 18:28.4 2.73 12t 30. Ba3 Qe8 31. Qc7+ Kg8 32. Be7 Kg7 33. Bd8+
Kf8 34. Bxf6H Qxe6H 35. Bg7+H Ke8H {HT} {190}
>Ba3 is easy to find because of the draw and the real test position is to
>find Nh5+ in the following position:
>
>8/p5kp/1p2Pnp1/3pQ3/2pP4/qnP3N1/6PP/6K1 w - - 0 2
>
>It is not very hard to fail high on Nh5+ but solving the fail high seems to be a
>very hard problem for movei on p800(16 mbytes hash tables) and it's branching
>factor is not good.
I also get a bad branching factor here, when Nh5 fails high. But it is not too
surprising, IMO.
948176 8.477 0.00 8t 2. Qc7+ Kh8 3. Qb8+ Kg7 4. Qc7+ {-420}
1841535 17.406 0.01 8t+ 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Qc1+ 7. Kg2 Qb2+ 8. Kh3 h6 9. Qf8+
Kh7 10. e7 Qxc3 11. e8=Q Nxd4 {341}
1888582 18.853 0.40 8++ 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Qc1+ 7. Kg2 Qb2+ 8. Kh3 h6 9. Qf8+
Kh7 10. e7 Qxc3 11. e8=Q Nxd4 {341}
2215451 22.534 1.40 8++ 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Qc1+ 7. Kg2 Qb2+ 8. Kh3 h6 9. Qf8+
Kh7 10. e7 Qxc3 11. e8=Q Qc1 {421}
3656104 35.942 4.54 8t 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Nxd4 7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kh3
Qf5+ 10. Qxf5 Nxf5 11. e8=Q+ Kg7 12. Qd7+ Kf6
13. Qxa7 {501}
3678733 36.196 4.54 8. 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Nxd4 7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kh3
Qf5+ 10. Qxf5 Nxf5 11. e8=Q+ Kg7 12. Qd7+ Kf6
13. Qxa7 {501}
5130597 51.115 4.75 9t 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Nxd4 7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kh3
Qf5+ 10. Qxf5 Nxf5 11. e8=Q+ Kg7 12. Qe6 Nh6
13. Qe7+ Nf7H {HT} {421}
6238514 1:00.5 4.75 9. 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Nxd4 7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kh3
Qf5+ 10. Qxf5 Nxf5 11. e8=Q+ Kg7 12. Qe6 Nh6
13. Qe7+ Nf7 {HT} {421}
7702096 1:14.3 5.15 10++ 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Nxd4 7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kh3
Qf5+ 10. Qxf5 Nxf5 11. e8=Q+ Kg7 12. Qe6 Nh6
13. Qxd5 a6 {HT} {501}
11492539 1:52.6 5.15 10t 2. Nh5+ gxh5 3. Qg5+ Kh8H 4. Qxf6+H Kg8H 5.
Qf7+H Kh8H 6. g3H Nxd4H 7. e7H Qc1+H 8. Kg2H
Qc2+H 9. Kg1H Ne2+H 10. Kh1H Nxg3+H 11. hxg3H
Qe4+H 12. Kh2H Qe2+H 13. Kh3H Qg4+H 14. Kg2H
{HT} {-240}
16171881 2:34.7 5.15 10. 2. Nh5+ gxh5 3. Qg5+ Kh8 4. Qxf6+ Kg8 5. Qf7+
Kh8 6. g3 Nxd4 7. e7 Qc1+ 8. Kg2 Qc2+ 9. Kg1
Ne2+ 10. Kh1 Nxg3+ 11. hxg3 Qe4+ 12. Kh2 Qe2+
13. Kh3 Qg4+ 14. Kg2 {HT} {-240}
Interestingly, Nh5 is found at depth 8 here, which would suggest, that in the
original position, a fail high at depth 10 for Ba3 could be expected. But it was
only at depth 11 ...
Regards,
Dieter
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