Author: Uri Blass
Date: 00:15:20 05/20/03
Go up one level in this thread
On May 20, 2003 at 02:17:14, Tim Foden wrote:
>On May 19, 2003 at 23:46:58, Will Singleton wrote:
>
>>I was trying to figure out why my latest build doesn't do quite as well on
>>ecm86, and I ran Ruffian on it. To my surprise, Ruffian couldn't solve it, even
>>given 5 minutes. This is odd, since most other progs can do it in less than 10
>>seconds. (What I take away from this exercise is that my program must now be
>>stronger. Otherwise, I'd have to work on the problem, which is much less
>>interesting than testing new ideas.)
>>
>>[D]2r3k1/1nqbrp2/p5pp/1p1Pp1N1/8/1P5P/P1B2PP1/2RQR1K1 w - -
>
>I would assume then (from running Green Light), that Nxf7 is the correct move
>here?
>
>The PV is interesting as it contains 9 captures in a row at the start of the PV.
> Maybe ruffian is pruning if there are more than a certain number of captures in
>a row (as this is very unlikely to be a good thing).
>
>Cheers, Tim.
>
>Analysis: GLC3.00, AXP 1.47GHz, 24MB Hash:
>
> Game stage: Middle game
> Current eval: 0.564
> Ply Time Score Nodes Principal variation
> 4 0.000 +0.743 5646 Ne4 Qb6 2. Qd2 g5
> 5 0.010 +0.592 13917 Ne4 Nd6 2. Nf6+ Kg7 3. Qf3 Kh8
> 5 0.020 +0.592 21231 Ne4 Nd6 2. Nf6+ Kg7 3. Qf3 Kh8
> 6 0.060 +0.702 54001 Ne4 Qb6 2. Qd2 g5 3. Qb4 Nc5
> 6 0.070 +0.702 66151 Ne4 Qb6 2. Qd2 g5 3. Qb4 Nc5
> 7 0.200 +0.709 159535 Ne4 Qb6 2. Bd3 Ree8 3. Qd2 g5 4. Nc3
> 7 0.310 +1.102 263663 Nxf7 {++} Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+
> Kxf7 5. Rxc1
> 7 0.360 +1.745 307058 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1
> 7 0.370 +1.745 316180 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1
> 8 0.440 +1.345 388531 Nxf7 {--} Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+
> Kxf7 5. Rxc1 Nd6
> 8 0.530 +1.186 460490 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6
> 8 0.580 +1.186 527044 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6
> 9 0.841 +1.259 749293 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7
> 9 1.081 +1.259 966741 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7
> 10 1.712 +1.299 1514631 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke7
> 10 2.093 +1.299 1853467 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke7
> 11 3.985 +1.340 3477228 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke7 7. g4
> 11 5.377 +1.340 4753269 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke7 7. g4
> 12 8.251 +1.405 7132424 Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke8 7. Ra7 Bc8
> 12 11.666 +1.405 10151k Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke8 7. Ra7 Bc8
> 13 19.798 +1.603 16605k Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke8 7. Ra7 Bc8 8. Rc7
> 13 25.416 +1.603 21432k Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke8 7. Ra7 Bc8 8. Rc7
> 14 40.958 +1.591 33530k Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke8 7. Ra7 Bc8 8. Rh7 Nf7
> 14 58.534 +1.591 49298k Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke8 7. Ra7 Bc8 8. Rh7 Nf7
> 15 1:50.67 +1.731 89853k Nxf7 Rxf7 2. Bxg6 Qxc1 3. Qxc1 Rxc1 4. Bxf7+ Kxf7
> 5. Rxc1 Nd6 6. Rc7 Ke8 7. Ra7 Bc8 8. Rh7 Nf7 9.
> Rg7
The pv of movei include only 6 captures even after a long search.
I do not think that it is a good idea to prune big number of captures in a row.
New game
2r3k1/1nqbrp2/p5pp/1p1Pp1N1/8/1P5P/P1B2PP1/2RQR1K1 w - - 0 1
Analysis by Movei00_8_068:
1.Nxf7
² (0.52) Depth: 8 00:00:03 504kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kg7 4.Qxc1 Rxc1 5.Rxc1 Kxf7
² (0.64) Depth: 8 00:00:03 548kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kg7 4.Qxc1 Rxc1 5.Rxc1 Kxf7
² (0.64) Depth: 8 00:00:04 597kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Qxe5+ Kg6 6.Rxc1 Rxc1+ 7.Kh2
Rc2 8.d6
± (0.85) Depth: 9 00:00:04 705kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Qxe5+ Kg6 6.Rxc1 Rxc1+ 7.Kh2
Rc2 8.d6
± (0.85) Depth: 9 00:00:06 900kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Qxe5+ Kg6 6.Rxc1 Rxc1+ 7.Kh2
Rc2 8.Qg3+ Kf7 9.Qf4+ Kg6
± (0.86) Depth: 10 00:00:07 1147kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Qxe5+ Kg6 6.Rxc1 Rxc1+ 7.Kh2
Rc2 8.Qg3+ Kf7 9.Qf4+ Kg6
± (0.86) Depth: 10 00:00:10 1594kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Rxc1 Rxc1+ 6.Kh2 Re1 7.Qh4 Kf7
8.Qxh6 Nc5
± (1.04) Depth: 11 00:00:15 2436kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Rxc1 Rxc1+ 6.Kh2 Re1 7.Qh4 Kf7
8.Qxh6 Nc5
± (1.04) Depth: 11 00:00:21 3445kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Rxc1 Rxc1+ 6.Kh2 Rc2 7.Qxe5+
Kg6 8.Kg3 Kf7 9.Qf4+ Kg6 10.d6
± (1.06) Depth: 12 00:00:34 5594kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kg7 5.Rxc1 Rxc1+ 6.Kh2 Rc2 7.Qxe5+
Kg6 8.Kg3 Kf7 9.Qf4+ Kg6 10.d6
± (1.06) Depth: 12 00:00:49 7973kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kf6 5.Rxc1 Rxc1+ 6.Kh2 Rc5 7.Qxh6+
Ke7 8.Qb6 Bc8 9.d6+ Ke6 10.g4 Rc2
+- (1.74) Depth: 13 00:04:33 39490kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kf6 5.Rxc1 Rxc1+ 6.Kh2 Rc5 7.Qxh6+
Ke7 8.Qb6 Bc8 9.d6+ Ke6 10.g4 Rc2
+- (1.74) Depth: 13 00:05:00 44182kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kf8 5.Rxc1 Rxc1+ 6.Kh2 Rc5 7.b4 Rc4
8.Qxh6+ Ke7 9.g4 Bc8 10.Kg3 Nd6 11.Qg5+ Kd7 12.Qxe5 Rxb4
+- (1.85) Depth: 14 00:08:29 73397kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kf8 5.Rxc1 Rxc1+ 6.Kh2 Rc5 7.b4 Rc4
8.Qxh6+ Ke7 9.g4 Bc8 10.Kg3 Nd6 11.Qg5+ Kd7 12.Qxe5 Rxb4
+- (1.85) Depth: 14 00:09:37 85315kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kf8 5.Rxc1 Rxc1+ 6.Kh2 Rc5 7.Qxe5
Kf7 8.Qf4+ Kg7 9.Qg3+ Kh7 10.Qd3+ Kg7 11.Qe4 Bc8 12.Qe5+ Kf7 13.Kg3
+- (1.88) Depth: 15 00:16:51 151019kN
1.Nxf7 Rxf7 2.Bxg6 Qxc1 3.Bxf7+ Kxf7 4.Qh5+ Kf8 5.Rxc1 Rxc1+ 6.Kh2 Rc5 7.Qxe5
Kf7 8.Qf4+ Kg7 9.Qg3+ Kh7 10.Qd3+ Kg7 11.Qe4 Bc8 12.Qe5+ Kf7 13.Kg3
+- (1.88) Depth: 15 00:20:26 187819kN
(, eim 20.05.2003)
Uri
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