Author: William Bryant
Date: 19:38:51 05/21/01
Go up one level in this thread
On May 21, 2001 at 21:25:05, Robert Hyatt wrote:
>On May 21, 2001 at 15:59:33, Uri Blass wrote:
>
>>
>>I read also the relevant position in a book of kasparov.
>>I think that +0.74 is not convincing.
>>Bxg7 does not lose material but white gets only Rook and a pawn and exposed king
>>for bishop and knight.
>>I am not convinced if white is winning and the position seems to be unclear to
>>me.
>>
>>If Deep blue JR's move gives a clear advantage for white then it is clearly
>>better
>>
>
>
>OK... now we have something to work with. I ran this position on a 4x550
>machine for a good while. Here is what I get:
>
> (2) 13 10:00 0.39 1. Nd2 Rcd8 2. Qg4 f6 3. Rc1 Bc5 4.
> Rxd8 Qxd8 5. Ne4 Qe7 6. Nxc5 bxc5 7.
> Bc3 Nb3 8. Re1
> 13 37:26 0.63 1. Rh5 Qc2 2. Qxe7 Qxb2 3. Qxa7 Nc4
> 4. a4 Qa2 5. Ng5 Rcd8 6. Nh7 Qe2 7.
> Qc7 Qxh5 8. Nxf8
> 13-> 37:26 0.63 1. Rh5 Qc2 2. Qxe7 Qxb2 3. Qxa7 Nc4
> 4. a4 Qa2 5. Ng5 Rcd8 6. Nh7 Qe2 7.
> Qc7 Qxh5 8. Nxf8
> 14 45:18 0.46 1. Rh5 Qc2 2. Qxe7 Qxb2 3. Qxa7 Nc4
> 4. a4 Qa2 5. Qd7 g6 6. Rd5 Ra8 7. Re1
> Qxa4
> (2) 14-> 82:37 0.46 1. Rh5 Qc2 2. Qxe7 Qxb2 3. Qxa7 Nc4
> 4. a4 Qa2 5. Qd7 g6 6. Rd5 Ra8 7. Re1
> Qxa4
> 15 122:55 ++ 1. Rh5!!
> 15 146:03 0.87 1. Rh5 Qc2 2. Qxe7 Qxb2 3. Ne5 Rc1
> 4. g4 Rxf1+ 5. Kxf1 Qa1+ 6. Kg2 Qd4
> 7. Qh4 Qd5+ <HT>
>
>
>It seems that I settle on DB Jr's move after 30+ minutes, although I am nowhere
>near their score after 2+ hours of searching (they had +1.5, I have +.87... I
>think Crafty might be "sniffing" what they are really seeing here. I will wait
>to see if depth=16 finds something better.
>
>But now we need some data from other programs as well to see if we all agree
>that Rh5 is best, and by how much, and how long it takes to find it. I will
>try to ask Murray how long DB Jr needs to find Rh5 and at what depth it finds
>it, for reference...
From the amature ranks,
Screamer (build 58) finds Bxg7 in about 3 minutes, but changes to Rh5 only after
more than 37 minutes.
This is on a 500mhz G4 laptop
Note: Note, both Screamer and Crafty like to do captures as white's and black's
second move that DBjr did choose, so we're persuing a different path.
New Board Position
2r2rk1/p1q1bpp1/1p6/n2R4/8/P4N2/1B2QPPP/5RK1 w - -
Move 1 W>>
The Current Search Time: 86400 seconds
Trying Book Move
PLY NODES TIME SCORE PV
______________________________________________________________
5/00 48611 0.507 +0.22 Rfd1 Rfd8 Be5 Qc4 Rxd8+ Rxd8 Rxd8+
Bxd8 Qe3
6/00 142865 1.422 +0.13 Rfd1 Rcd8 Be5 Qc4 Qxc4 Nxc4 a4
7/00 635946 6.276 +0.12 Rfd1 Rfd8 Be5 Qc6 Rxd8+ Rxd8 Rxd8+
Bxd8 Qd2 Bf6 Nd4
8/00 2013444 19.444 +0.07 Rfd1 Rfd8 Be5 Qc4 Rxd8+ Bxd8 Qb2 Qa4
Qa1 Nc4
9/00 8931536 85.093 +0.06 Rfd1 Rfd8 Be5 Qc6 R5d4 Qa8 Rg4 Rxd1+
Qxd1 f6 Qd7
9/03 18394758 177.424 +0.17 Bxg7 Kxg7 Ne5 Rh8 Rd7 Qc5 Nd3 Qxa3
Qxe7 Qxe7 Rxe7
10/00 28906112 296.404 ++ Bxg7
10/00 55834339 566.341 +0.74 Bxg7 Kxg7 Ne5 Rcd8 Qg4+ Kh8 Nd7 f5
Qd4+ Kg8 Nxf8 Rxf8 Rd7
11/00 122796510 1214.373 +0.69 Bxg7 Kxg7 Ne5 Rcd8 Qg4+ Kh8 Nd7 f5
Qh5+ Kg8 Qg6+ Kh8 Nxf8 Rxf8 Qh6+ Kg8 Rc1
11/01 225590840 2225.672 +0.84 Rh5 Qc2 Qxe7 Qxb2 Ne5 g6 Nd7 Kg7 Rxa5
bxa5 Nxf8 Rxf8 Re1
----- Search Stopped -----
Total Search Time: 2229 seconds
Move: Rh5
William
wbryant@ix.netcom.com
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