Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: Test Move....Black Wins..

Author: Dann Corbit

Date: 15:37:44 02/17/03

Go up one level in this thread


On February 17, 2003 at 18:24:32, Anthony Cozzie wrote:

>On February 17, 2003 at 17:57:53, Art Basham wrote:
>
>>Here black plays the simple Rf6...
>>then Rg6, and then later Rg4....and  of course wins...!
>>...(If white tries to play h4, etc, Rxh4 mates)..
>>
>>[D]5rk1/1p1r2p1/1Qp1p2p/2P4q/3P3P/2R1PbP1/PP3P2/5RK1 b - h3 0 4
>>
>>There may be other ways to win, but I wonder if any computer program
>>finds....Rf6..?
>
>1...Be2 2. Rcc1 Qg4 3. Kh2 Bxf1 4. Rxf1 Rdf7 5. Kg2
> = (3.25)       Depth: 10       00:00:06.92     1122kN
>1...Qg4 2. Kh2 Bd5 3. Ra3 Qe2 4. Kg1 Rxf2 5. Ra1
> + (3.75)       Depth: 11       00:00:11.48     1986kN
>1...Qg4 2. Kh2 Bd5 3. Qa7 Qf3 4. e4 Qxe4 5. f3 Qe2 6. Kg1 Qxb2 7. Ra3
> = (3.98)       Depth: 11       00:00:14.99     2572kN
>1...Qg4 2. Kh2 Bd5 3. Qa7 Qf3 4. e4 Qxe4 5. f3 Qe2 6. Kg1 Qxb2 7. Ra3 Bc4
> + (4.48)       Depth: 12       00:00:17.17     2972kN
>1...Qg4 2. e4 Qh3 3. Rxf3 Rxf3 4. Qb4 Rd3 5. Qa5 Kh7 6. Qa8 Rf3
> = (4.39)       Depth: 12       00:00:45.13     7641kN
>1...Be4 2. Qb3 Qg4 3. Kh2 Qf3 4. Qxe6 Rdf7 5. Qh3 Qe2 6. Rc4 Qxc4 7. g4
> + (4.89)       Depth: 13       00:01:24.99     14728kN
>1...Be4 2. Qb3 Qg4 3. Kh2 Qf3 4. Qxe6 Rdf7 5. Qxe4 Qxe4 6. f4 Rb8 7. a3 b6 8.
>cxb6
> = (5.96)       Depth: 13       00:02:23.50     24908kN
>
>Be2, Qg4, and Be2 all appear to win.  Zappa believes Be4 is the most precise.
>
>After forcing Rf6:
>
>1. e4 Bxe4 2. Re3 Qg4 3. f4 Rxd4 4. Qxb7 Qh3 5. Qc8 Rf8 6. Qa6
> = (-2.87)      Depth: 11       00:00:30.79     6299kN
>1. e4 Qg4 2. Kh2 Qxe4 3. Qb3 Bh1 4. Rd1 Rxf2 5. Kh3
> - (-3.37)      Depth: 12       00:01:18.46     16161kN
>1. e4 Qg4 2. Kh2 Qxe4 3. Re3 Qxd4 4. Qb3 Qg4 5. Rg1 Kh7
> = (-3.49)      Depth: 12       00:01:37.31     20292kN
>
>I think you underestimated the ability of computer programs to throw away pieces
>to avoid mate.  Black wins of course, but not immediately.  Or I didn't let
>Zappa run long enough :)

g5 is a truly obvious move (I call any move truly obvious if I can see it
immediately) and goes up by a full queen in material:

E:\programme\winboard\ruffian>ruffian -h 300M -T \rf6.epd -t 999 -p 99
Hash size 314572800
Ruffian 1.0.1
feature done=0
Loading configuration: ruffian.cfg
Warning: EGTB_HASH_SIZE changed, default=1048576, newvalue=8388608
Logfile: Mon Feb 17 15:18:16 2003
Total hash size 300M
Initializing tablebases: /programme/winboard/nalimov
Testing \rf6.epd, 999 seconds, extra ply 99
Testing: test 1   Solution: Rf6
  5rk1/1p1r2p1/1Qp1p2p/2P4q/3P3P/2R1PbP1/PP3P2/5RK1 b - h3
  Depth   Time  Score    Best line
   9/22   1.43     ++    ... g5
   9/22   2.06   4.51    ... g5 Qb3 Re7 e4 gxh4 Rxf3 Rxf3 Qb6 hxg3 Qd8+ Re8
   9-->   2.10   4.51    ... g5 Qb3 Re7 e4 gxh4 Rxf3 Rxf3 Qb6 hxg3 Qd8+ Re8
  10/24   3.27   4.33    ... g5 Qb3 Re7 Kh2 gxh4 g4 Bxg4 f3 Bf5 Kh1
  10-->   3.80   4.33    ... g5 Qb3 Re7 Kh2 gxh4 g4 Bxg4 f3 Bf5 Kh1
  11/27   7.56     ++    ... g5
  11/30  11.43   5.06    ... g5 Qb3 Re7 Kh2 gxh4 g4 Bxg4 f3 Bxf3 Rg1+ Bg4
                         Kh1
  11-->  12.03   5.06    ... g5 Qb3 Re7 Kh2 gxh4 g4 Bxg4 f3 Bxf3 Rg1+ Bg4
                         Kh1
  12/32  24.08     ++    ... g5
  12/32  44.55   5.78    ... g5 e4 gxh4 Rxf3 Qxf3 Qb3 Qxe4 Qe3 Qxe3 fxe3 hxg3
                         Rxf8+ Kxf8 Kg2 Rg7
  12-->  47.28   5.78    ... g5 e4 gxh4 Rxf3 Qxf3 Qb3 Qxe4 Qe3 Qxe3 fxe3 hxg3
                         Rxf8+ Kxf8 Kg2 Rg7
  13/32   1:00     ++    ... g5
  13/35   1:29   8.70    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Rf8 Qxg3+
                         Rg7 Qxg7+ Kxg7 f3 Rd8 Kf2 Rxd4
  13-->   1:31   8.70    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Rf8 Qxg3+
                         Rg7 Qxg7+ Kxg7 f3 Rd8 Kf2 Rxd4
  14/36   1:40     --    ... g5
  14/38   2:06     ++    ... g5
  14/38   2:50   9.82    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Kh7 Qxg3 Rxg3+
                         fxg3 Qg4 Kh2 Qe2+ Kg1 Qxb2 d5 exd5 Rf2
  14-->   3:00   9.82    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Kh7 Qxg3 Rxg3+
                         fxg3 Qg4 Kh2 Qe2+ Kg1 Qxb2 d5 exd5 Rf2
  15/38   4:01     ++    ... g5
  15/38   4:56  10.49    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Kh7 fxg3 Rxf1+
                         Kxf1 Rf7+ Qf4 Rxf4+ gxf4 Qf3+ Kg1 Qe3+ Kg2 Qxe4+
                         Kg3 Qxd4 Kf3 Qxb2
  15-->   5:57  10.49    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Kh7 fxg3 Rxf1+
                         Kxf1 Rf7+ Qf4 Rxf4+ gxf4 Qf3+ Kg1 Qe3+ Kg2 Qxe4+
                         Kg3 Qxd4 Kf3 Qxb2
  16/41   8:45  10.72    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Kh7 fxg3 Rxf1+
                         Kxf1 Rf7+ Qf4 Rxf4+ gxf4 Qf3+ Kg1 Qxe4 b3 Qxf4 Kg2
                         Qxd4
  16-->  11:01  10.72    ... g5 e4 gxh4 Rxf3 Rxf3 Qa7 hxg3 Qb8+ Kh7 fxg3 Rxf1+
                         Kxf1 Rf7+ Qf4 Rxf4+ gxf4 Qf3+ Kg1 Qxe4 b3 Qxf4 Kg2
                         Qxd4
  17...  11:01   1/39    g5

Time: 16:39, cpu 94.52%, nodes 605500673, nps 606094
Hash: 128M, used 100%, hits 21%
EGTB: probs 0, hits 0

Best move: g5 (10.72)  Not solved (0/1)

Summery: 0/1

Quite frankly, I think it would be hard to throw away the win from here.



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.