Author: Robert Hyatt
Date: 18:49:00 04/14/00
Go up one level in this thread
On April 13, 2000 at 19:54:41, Will Singleton wrote:
>On April 13, 2000 at 17:25:43, Will Singleton wrote:
>
>>On April 13, 2000 at 10:31:56, Jon Dart wrote:
>>
>>>I've been looking at the BT2630 test suite, which I run routinely.
>>>
>>>One of the positions is #26:
>>>
>>>[D]2r3k1/pbr1q2p/1p2pnp1/3p4/3P1P2/1P1BR3/PB1Q2PP/5RK1 w - - bm f5; id "test 26";
>>>
>>>Is f5 really a decisive move here? Currently my program likes g3
>>>after searching nearly 200 million nodes. At earlier plies it
>>>selected Re5. They all look pretty reasonable to me. f5 looks
>>>good : but is it positionally better, or does White get material
>>>or a decisive attack?
>>>
>>
>>Amateur starts with f5, but drops from a high of about +1 at ply 8 to +0.19 by
>>ply 12. I would guess that f5 might not be that much better than the others,
>>but what do the commercials say?
>>
>
>Hiarcs 6, 30 minutes, 300 mhz -- ce 43; pv f5 Ne4 Bxe4 dxe4 fxg6 Rc2 gxh7+ Kh8
>d5+ e5 d6 Qe6 Rf8+ Kxh7 Qd1 Rxf8 Qxc2 Qxd6 ;
>
>>
>>>Another one that I'm not passing at present is #13:
>>>
>>>[D]2bq3k/2p4p/p2p4/7P/1nBPPQP1/r1p5/8/1K1R2R1 b - - bm Be6; id "test 13";
>>>
>>>I used to get Be6, but now on a faster machine it eventually
>>>switches back to c2+ at ply 12 and holds it.
>>>
>>>--Jon
>>
>>Mine starts with c2 and stays there, though the score steadily drops, ending at
>>+2.
>>
>
>
>Hiarcs 6, 30 minutes, 300 mhz -- ce -31; pv c2+ Kb2 cxd1=Q Rxd1 Ra5 Rf1 Bxg4
>Qxg4 Rg5 Qf3 a5 h6 d5 exd5 Qd6 Qf8+ Rg8 Qf7 ;
>
>I let this one go longer, and about 40 minutes it switched to Be6 with a score
>of +1.16. I wonder if any program can find this within 15 minutes?
>
>Will
I ran this:
11 29.35 -- 1. ... c2+
11 50.43 0.95 1. ... c2+ 2. Kb2 cxd1=N+ 3. Rxd1 Ra4
4. Rf1 Be6 5. Qh6 Nd3+ 6. Kc3 Rxc4+
7. Kxd3 Bg8 8. Rf8 Qe7 9. Rxg8+ Kxg8
10. Kxc4 Qxe4
11 1:13 1.14 1. ... Be6 2. Bxe6 c2+ 3. Kc1 cxd1=Q+
4. Rxd1 Nd3+ 5. Rxd3 Rxd3 6. e5 Rh3
7. Qf6+ Qxf6 8. exf6 Rh2 9. f7 Kg7
10. d5 Re2
(4) 11-> 1:33 1.14 1. ... Be6 2. Bxe6 c2+ 3. Kc1 cxd1=Q+
4. Rxd1 Nd3+ 5. Rxd3 Rxd3 6. e5 Rh3
7. Qf6+ Qxf6 8. exf6 Rh2 9. f7 Kg7
10. d5 Re2
12 1:48 ++ 1. ... Be6!!
(3) 12 5:26 3.48 1. ... Be6 2. Qc1 c2+ 3. Kb2 Bxc4 4.
Kxa3 c5 5. Kb2 Qb6 6. dxc5 cxd1=N+
7. Qxd1 Nd3+ 8. Kc3 Qb4+ 9. Kd4 Bb3+
10. Kxd3 Bxd1 11. Rxd1 Qxc5
It actually liked that move at a couple of earlier plies, but the pawn push
sneaks back in as best ...until this point
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