Author: Robert Hyatt
Date: 09:24:05 08/26/05
Go up one level in this thread
On August 26, 2005 at 08:14:21, Gian-Carlo Pascutto wrote:
>[D]2r2k2/5pp1/1p1p1q1p/p1rRpP2/2PbP3/PP4P1/3QB1KP/2R5 b - -
>
>Zappa played 27. .. Ke7, which looks funny, but is not bad. In fact, against
>Deep Sjeng (and countless other programs) it is the winning move. Like a red lap
>against a bull, Deep Sjeng replied with b4?? which is losing. Black's king looks
>exposed in the center but is in reality unassainable, instead *white* must be
>careful. Zappa must have seen it because the score went up immediately after b4.
>
>White can at least draw with 28. a4.
>
>Your mission is: avoid 28. b4
>
>[D]3k4/6p1/3p1pP1/4pP2/3bP2q/r2B1Q1p/7P/3R3K w - -
>
>49. Rb1 loses instantly because after Rc3, white is in zugzwang! Deep Sjeng
>could not avoid it because of that. Can your program (and does it understand
>what is happening)?
>
>--
>GCP
Here is crafty's analysis on the WCCC machine.
If I tell it to only search Rb1, it gets this:
13 1.12 -1.35 1. Rb1 Rc3 2. Rf1 Ke7 3. Qe2 Qg5 4.
Ba6 Kf8 5. Bb5 Ra3 6. Rd1 Re3 7. Qc2
13-> 1.12 -1.35 1. Rb1 Rc3 2. Rf1 Ke7 3. Qe2 Qg5 4.
Ba6 Kf8 5. Bb5 Ra3 6. Rd1 Re3 7. Qc2
14 1.44 -1 1. Rb1
14 2.79 -3.40 1. Rb1 Rc3 2. Ra1 Rb3 3. Qf1 Bxa1 4.
Qxa1 Qf2 5. Qa5+ Qb6 6. Qa2 Qe3 7.
Qa5+ Rb6 8. Qa8+ Kc7 9. Qd5
14-> 2.79 -3.40 1. Rb1 Rc3 2. Ra1 Rb3 3. Qf1 Bxa1 4.
Qxa1 Qf2 5. Qa5+ Qb6 6. Qa2 Qe3 7.
Qa5+ Rb6 8. Qa8+ Kc7 9. Qd5
15 3.74 -3.52 1. Rb1 Rc3 2. Ra1 Rb3 3. Qf1 Bxa1 4.
Qxa1 Qf2 5. Qa5+ Qb6 6. Qxb6+ Rxb6
7. Kg1 Rb3 8. Ba6 Rb4 9. Bd3 Rb2
15-> 3.74 -3.52 1. Rb1 Rc3 2. Ra1 Rb3 3. Qf1 Bxa1 4.
Qxa1 Qf2 5. Qa5+ Qb6 6. Qxb6+ Rxb6
7. Kg1 Rb3 8. Ba6 Rb4 9. Bd3 Rb2
so it realizes that is busted quickly. If I tell it to search the position
normally, I get this:
11 0.48 -1.16 1. Rb1 Rc3 2. Rf1 Qf4 3. Qh5 Qe3 4.
Qh8+ Kc7 5. Qxg7+ Kc6 6. Qxf6 Qxd3
7. Re1
11-> 0.74 -1.16 1. Rb1 Rc3 2. Rf1 Qf4 3. Qh5 Qe3 4.
Qh8+ Kc7 5. Qxg7+ Kc6 6. Qxf6 Qxd3
7. Re1 (s=2)
12 1.53 -1.32 1. Rb1 Rc3 2. Ra1 d5 3. Rf1 dxe4 4.
Qxe4 Qxe4+ 5. Bxe4 Re3 6. Bd5 Re2 7.
Rb1 e4 8. Rb7
12 2.56 -1.20 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Re3 4.
Qa2 Qg2+ 5. Qxg2 hxg2+ 6. Kxg2 Rxe4
7. Rb1 Rg4+ 8. Kh3 Rg5
12-> 2.59 -1.20 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Re3 4.
Qa2 Qg2+ 5. Qxg2 hxg2+ 6. Kxg2 Rxe4
7. Rb1 Rg4+ 8. Kh3 Rg5 (s=4)
13 3.06 -1.27 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Rc3 4.
Ba6 Re3 5. Qc2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. Rc1 d5 (s=3)
13-> 3.69 -1.27 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Rc3 4.
Ba6 Re3 5. Qc2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. Rc1 d5 (s=3)
14 4.69 -1.27 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Re3 5. Qc2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. Bc4 Be3 9. Bd5 (s=2)
14-> 6.19 -1.27 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Re3 5. Qc2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. Bc4 Be3 9. Bd5 (s=2)
15 8.93 -1.32 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Re3 5. Qc2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. h3 Re2+ 9. Kg3 Rc2 10.
Bd5
15-> 18.67 -1.32 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Re3 5. Qc2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. h3 Re2+ 9. Kg3 Rc2 10.
Bd5 (s=2)
16 28.95 -1.31 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Re3 5. Qc2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. Bc4 Be3 9. Bd5 Rd4 10.
Bc6
16-> 1:03 -1.31 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Re3 5. Qa2 Qg2+ 6. Qxg2 hxg2+ 7.
Kxg2 Rxe4 8. Bc4 Be3 9. Bd5 Rd4 10.
Bc6 (s=2)
17 1:25 -1.39 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Bb6 5. Bg8 Re3 6. Qa2 Qg2+ 7. Qxg2
hxg2+ 8. Kxg2 Rxe4 9. Rb1 Re2+ 10.
Kh3 Be3 11. Bd5
17-> 3:53 -1.39 1. Qe2 Qf4 2. Rf1 Qg5 3. Bc4 Ke7 4.
Bf7 Bb6 5. Bg8 Re3 6. Qa2 Qg2+ 7. Qxg2
hxg2+ 8. Kxg2 Rxe4 9. Rb1 Re2+ 10.
Kh3 Be3 11. Bd5 (s=3)
Maybe I don't understand the problem or "bug" I am supposed to have here???
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