Author: Renze Steenhuisen
Date: 10:27:30 05/06/05
Go up one level in this thread
On May 05, 2005 at 23:52:03, Steven Edwards wrote:
>Here's WCSAC.0016:
>
>[D] r4rk1/pp1b2p1/2p4n/2Qp1p1R/3P4/3BP3/PP2NPq1/1K5R w - - 0 1
>
>The book gives the answer 1. Rxh6, but a lengthy analysis says that the capture
>is better if it's deferred a couple of moves:
>
>pes +2.257;
>pv Qd6 Rf7 Nf4 Qxf2 Rxh6 gxh6 Qxh6 Rg7 Qh8+ Kf7 Qxa8 Rg1+ Rxg1 Qxg1+ Kc2 Qxe3
>Qxb7 Ke8;
>
>Is there a bug in the problem or in the analysis?
Don't know whether there is either a bug in the book or program, but this is
what Crafty thinks (3 GHz PIV, 768MB HashTable):
clearing hash tables
time surplus 0.00 time limit 166666:39 (166666:39)
depth time score variation (1)
1 0.00 1.81 1. Qe7
1-> 0.01 1.81 1. Qe7
2 0.01 1.75 1. Qe7 Rad8
2-> 0.01 1.75 1. Qe7 Rad8
3 0.01 1.75 1. Qe7 Rad8 2. R5h2
3 0.01 1.89 1. Qd6 Be8 2. R5h2
3-> 0.02 1.89 1. Qd6 Be8 2. R5h2
4 0.02 1.57 1. Qd6 Be8 2. R5h2 Rf6
4 0.03 1.91 1. Rxh6 gxh6 2. Rg1 Qg4 3. Rxg4+ fxg4
4-> 0.03 1.91 1. Rxh6 gxh6 2. Rg1 Qg4 3. Rxg4+ fxg4
5 0.04 1.91 1. Rxh6 gxh6 2. Rg1 Qg4 3. Rxg4+ fxg4
5-> 0.05 1.91 1. Rxh6 gxh6 2. Rg1 Qg4 3. Rxg4+ fxg4
6 0.06 2.01 1. Rxh6 gxh6 2. Rg1 Qg4 3. Rxg4+ fxg4
4. Nf4
6-> 0.10 2.01 1. Rxh6 gxh6 2. Rg1 Qg4 3. Rxg4+ fxg4
4. Nf4
7 0.13 1.99 1. Rxh6 gxh6 2. Rg1 Qg4 3. f3 b6 4.
Rxg4+ fxg4
7-> 0.28 1.99 1. Rxh6 gxh6 2. Rg1 Qg4 3. f3 b6 4.
Rxg4+ fxg4
8 0.38 ++ 1. Rxh6!!
8 0.44 2.44 1. Rxh6 gxh6 2. Rg1 Qxg1+ 3. Nxg1 Rf6
4. Kc2 Rg6 5. Nf3
8-> 0.78 2.44 1. Rxh6 gxh6 2. Rg1 Qxg1+ 3. Nxg1 Rf6
4. Kc2 Rg6 5. Nf3
9 0.95 2.32 1. Rxh6 gxh6 2. Rg1 Qxg1+ 3. Nxg1 Rf7
4. Nf3 b6 5. Qd6 h5
9 2.05 2.34 1. Qd6 Rf7 2. Rxh6 gxh6 3. Rg1 Qxg1+
4. Nxg1 h5 5. Kc2 Rg7 6. Nf3
9-> 2.33 2.34 1. Qd6 Rf7 2. Rxh6 gxh6 3. Rg1 Qxg1+
4. Nxg1 h5 5. Kc2 Rg7 6. Nf3
10 3.74 ++ 1. Qd6!!
10 4.95 3.08 1. Qd6 Rf7 2. Nf4 Qxf2 3. Rxh6 gxh6
4. Qxh6 Rg7 5. Qh8+ Kf7 6. Qxa8 Rg1+
7. Rxg1 Qxg1+ 8. Kc2 Qxe3 9. Qxb7
10-> 6.44 3.08 1. Qd6 Rf7 2. Nf4 Qxf2 3. Rxh6 gxh6
4. Qxh6 Rg7 5. Qh8+ Kf7 6. Qxa8 Rg1+
7. Rxg1 Qxg1+ 8. Kc2 Qxe3 9. Qxb7
11 11.21 3.06 1. Qd6 Rf7 2. Nf4 Qxf2 3. Rxh6 gxh6
4. Qxh6 Rg7 5. Qh8+ Kf7 6. Qxa8 Qxe3
7. Qxb7 Rg1+ 8. Rxg1 Qxg1+
11-> 19.92 3.06 1. Qd6 Rf7 2. Nf4 Qxf2 3. Rxh6 gxh6
4. Qxh6 Rg7 5. Qh8+ Kf7 6. Qxa8 Qxe3
7. Qxb7 Rg1+ 8. Rxg1 Qxg1+
12 29.23 3.21 1. Qd6 Rf7 2. Nf4 Qf3 3. R5h3 Qxf2
4. Kc1 Re8 5. Rf1 Qxe3+ 6. Rxe3 Rxe3
7. Qb8+ Be8 8. Qxa7
12-> 46.44 3.21 1. Qd6 Rf7 2. Nf4 Qf3 3. R5h3 Qxf2
4. Kc1 Re8 5. Rf1 Qxe3+ 6. Rxe3 Rxe3
7. Qb8+ Be8 8. Qxa7
13 1:27 3.51 1. Qd6 Rf7 2. Kc2 Qg4 3. Rxh6 gxh6
4. Qxh6 Qg7 5. Rg1 Qxg1 6. Nxg1 Rg7
7. Qd6 a5
13-> 1:46 3.51 1. Qd6 Rf7 2. Kc2 Qg4 3. Rxh6 gxh6
4. Qxh6 Qg7 5. Rg1 Qxg1 6. Nxg1 Rg7
7. Qd6 a5
14 3:09 ++ 1. Qd6!!
14 6:52 4.44 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qg7
4. Rg1 Qxg1+ 5. Nxg1 Rf7 6. Nf3 Bd7
7. Ne5 Rh7 8. Qf4 Rh1+ 9. Kc2
14-> 7:55 4.44 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qg7
4. Rg1 Qxg1+ 5. Nxg1 Rf7 6. Nf3 Bd7
7. Ne5 Rh7 8. Qf4 Rh1+ 9. Kc2
15 11:24 4.39 1. Qd6 Rf7 2. Nf4 Qf3 3. R5h3 Qxf2
4. Be2 Qxe2 5. Nxe2 f4 6. Rxh6 Bf5+
7. Kc1 gxh6 8. Nxf4 Re8 9. Qxh6 Rxe3
15-> 14:00 4.39 1. Qd6 Rf7 2. Nf4 Qf3 3. R5h3 Qxf2
4. Be2 Qxe2 5. Nxe2 f4 6. Rxh6 Bf5+
7. Kc1 gxh6 8. Nxf4 Re8 9. Qxh6 Rxe3
16 24:45 4.67 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Ng3 Rf7 6. Qg2 Kf8 7.
Qh3 Ke7 8. Qh4+ Ke6 9. Qh6+ Ke7 10.
Qg5+ <HT>
16-> 33:44 4.67 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Ng3 Rf7 6. Qg2 Kf8 7.
Qh3 Ke7 8. Qh4+ Ke6 9. Qh6+ Ke7 10.
Qg5+ Kd6 <HT>
17 55:14 4.83 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Qg2+ Kf7 6. Qh2 Ke8
7. Qf4 Kd8 8. Ng3 Rg8 9. Bxf5 Bxf5+
10. Nxf5 Rg2 11. Kc2
17-> 71:34 4.83 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Qg2+ Kf7 6. Qh2 Ke8
7. Qf4 Kd8 8. Ng3 Rg8 9. Bxf5 Bxf5+
10. Nxf5 Rg2 11. Kc2
18 123:22 4.94 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Qg2+ Kf7 6. Qh2 Rac8
7. Qh7+ Ke8 8. Ng3 Kd8 9. Nxf5 Bxf5
10. Bxf5 Rc7 11. Qh4+ Re7 12. Qf4
18-> 182:58 4.94 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Qg2+ Kf7 6. Qh2 Rac8
7. Qh7+ Ke8 8. Ng3 Kd8 9. Nxf5 Bxf5
10. Bxf5 Rc7 11. Qh4+ Re7 12. Qf4
19 306:36 4.99 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Qg2+ Kf7 6. Qh2 Rae8
7. Qh7+ Ke6 8. Ng3 Kd6 9. Bxf5 Rd8
10. Qg7 Rfe8 11. Qf6+ Kc7 12. Kc2 Bxf5+
13. Nxf5
19-> 502:51 4.99 1. Qd6 Be8 2. Rxh6 gxh6 3. Qxh6 Qxh1+
4. Qxh1 Bd7 5. Qg2+ Kf7 6. Qh2 Rae8
7. Qh7+ Ke6 8. Ng3 Kd6 9. Bxf5 Rd8
10. Qg7 Rfe8 11. Qf6+ Kc7 12. Kc2 Bxf5+
13. Nxf5
20 534:00 1/50* 1. Qd6
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