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.
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