Author: Jon Dart
Date: 10:07:03 06/10/00
Go up one level in this thread
On June 10, 2000 at 02:15:47, Paulo Soares wrote:
>
>I think that 1...Qb7 don't hold the position for a long time.
>
>1... Qb7 2. Ne5 fxe6 (2... Rf8 3. exf7+ Rxf7 4. Nxf7 Qxf7 5. Qe5 {+-})
>3. f6 Rf8 4. Ng4 {!} Qf7 5. Qe5 {+-}
>
>Paulo Soares, from Brazil
I think you're right about this. After .. Qb7 Ne5,
I let Arasan search for 10 minutes and got:
fxe6 f6 Rf8 h6 g6 Qg4 Qc8 f7+ Rxf7 Nxf7 Kxf7 Qxd1 Ke8 Qa4+ Qd7 Qc2
with a score of -0.27. So White at least gets even.
Arasan didn't find 4. Ng4 in this time, but it looks even better.
After Qb7 Ne5 fxe6 f6 Rf8 Ng4:
ply 1. Qf7 0 seconds. score: 5.45 12 nodes.
ply 1. Qf7 0 seconds. score: 5.45 40 nodes.
ply 2. Qf7 0 seconds. score: 5.45 167 nodes.
ply 2. gxf6 0 seconds. score: 4.56 292 nodes.
ply 2. gxf6 0 seconds. score: 4.56 374 nodes.
ply 3. Qa6 0 seconds. score: 4.95 2716 nodes.
ply 3. Qa6 0 seconds. score: 4.95 2852 nodes.
ply 4. Qa6 0 seconds. score: 4.95 7185 nodes.
ply 4. Qa6 0 seconds. score: 4.33 7581 nodes.
ply 4. Qa6 0 seconds. score: 4.33 7641 nodes.
ply 5. Qa6 0 seconds. score: 4.47 19175 nodes.
ply 6. Qa6 0 seconds. score: 4.47 39482 nodes.
ply 6. Qf7 0 seconds. score: 2.02 69841 nodes.
ply 6. Qf7 1 seconds. score: 2.02 111249 nodes.
ply 7. Qf7 1 seconds. score: 2.02 235386 nodes.
ply 7. Qf7 2 seconds. score: 1.33 320791 nodes.
ply 8. Qf7 4 seconds. score: 0.95 857965 nodes.
ply 9. Qf7 10 seconds. score: 0.38 2054324 nodes.
ply 10. Qf7 21 seconds. score: 0.17 4326982 nodes.
ply 11. Qf7 91 seconds. score: -0.27 19241829 nodes.
ply 12. Qf7 292 seconds. score: -0.27 63277252 nodes.
ply 12. Qf7 325 seconds. score: -0.89 71036714 nodes.
ply 12. Qf7 325 seconds. score: -0.89 71155771 nodes.
ply 13. Qf7 600 seconds. score: -1.47 132035261 nodes.
220055 nodes/second.
36043267 regular nodes, 95991994 quiescence nodes.
33277903 searches of hash table, 8582857 successful (25 percent).
500000 hash entries inserted, 1926084 entries replaced, 25296389 inserts failed.
search: Qf7 600 seconds. score: -1.47 132035261 nodes. ++ corre
ct
Qf7 Qe5
It still takes a long time to see that White is ahead.
--Jon
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