Author: Dann Corbit
Date: 10:09:53 04/13/01
Here is the position for WAC 230, after the key move Rb4...
[D]2b5/8/2kBp1p1/p2pP1P1/1rpP4/1pP3K1/1R3P2/8 w - - bm Rb4; id "WAC.230 after
Rb4";
Here is some analysis performed on this position on a fast machine (still
on-going):
book file enabled.
choose from book moves randomly (using weights.)
choose from 5 best moves.
book learning enabled
result learning enabled
position learning enabled
threshold set to 9 pawns.
4 piece tablebase files found
3358kb of RAM used for TB indices and decompression tables
Crafty v18.9 (2 cpus)
White(1): mt 2
max threads set to 2
White(1): st 86400
search time set to 86400.00.
White(1): epdpfga wac230.epd wac230.out
PFGA: EPD record: 1 ID: WAC.230 after Rb4
end-game phase
clearing hash tables
time surplus 0.00 time limit 1440:00 (1440:00)
nss depth time score variation (1)
starting thread 1
9 0.13 -- 1. cxb4
9 0.16 0.34 1. cxb4 a4 2. Rb1 Kb5 3. Ra1 c3 4.
Rc1 b2 5. Rxc3 b1=Q 6. Rxc8 <HT>
9-> 0.17 0.34 1. cxb4 a4 2. Rb1 Kb5 3. Ra1 c3 4.
Rc1 b2 5. Rxc3 b1=Q 6. Rxc8 <HT>
10 0.28 -- 1. cxb4
10 0.47 -0.76 1. cxb4 a4 2. b5+ Kxb5 3. Kf4 c3 4.
Rb1 c2 5. Rc1 b2 6. Rxc2 b1=Q 7. Rxc8
10-> 0.53 -0.76 1. cxb4 a4 2. b5+ Kxb5 3. Kf4 c3 4.
Rb1 c2 5. Rc1 b2 6. Rxc2 b1=Q 7. Rxc8
11 0.81 -0.76 1. cxb4 a4 2. b5+ Kxb5 3. Kf4 c3 4.
Rb1 c2 5. Rc1 b2 6. Rxc2 b1=Q 7. Rc5+
Kb6 8. Rxc8
11-> 0.91 -0.76 1. cxb4 a4 2. b5+ Kxb5 3. Kf4 c3 4.
Rb1 c2 5. Rc1 b2 6. Rxc2 b1=Q 7. Rc5+
Kb6 8. Rxc8
12 1.61 -1.14 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Rd1 b2 6. Rb1 Kb3 7. Bxb2
cxb2 8. Kf4 <HT>
12-> 1.83 -1.14 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Rd1 b2 6. Rb1 Kb3 7. Bxb2
cxb2 8. Kf4 <HT>
13 2.89 -- 1. cxb4
13 3.98 -1.69 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Rc1 Kc4 5. Ba3 Kxd4 6. Kf4 Kd3 7. Rd1+
Kc4 <HT>
13-> 4.58 -1.69 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Rc1 Kc4 5. Ba3 Kxd4 6. Kf4 Kd3 7. Rd1+
Kc4 <HT>
14 4.91 ++ 1. cxb4!!
14-> 19.08 -1.30 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Rc1 Kc4 5. Ba3 Kxd4 6. Kf4 Kd3 7. Rd1+
Kc4 <HT>
15 24.17 -- 1. cxb4
15 32.22 -2.11 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Rc1 Kxd4 6. Bb4 c2 7. Ba3
Kxe5 8. f4+ Ke4 9. Re1+ Kd3 10. Rc1
15-> 34.64 -2.11 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Rc1 Kxd4 6. Bb4 c2 7. Ba3
Kxe5 8. f4+ Ke4 9. Re1+ Kd3 10. Rc1
16 44.41 -2.08 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Rc1 Kxd4 6. Kf4 Kd3 7. Rd1+
Kc2 8. Rc1+ Kd2 9. Rh1 Bb7 10. f3
16-> 47.98 -2.08 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Rc1 Kxd4 6. Kf4 Kd3 7. Rd1+
Kc2 8. Rc1+ Kd2 9. Rh1 Bb7 10. f3
17 1:18 -2.13 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Kf4 Kxd4 6. Rh1 Kd3 7. Rh3+
Kd2 8. Bc1+ Kc2 9. Be3 b2 10. Bd4 b1=Q
11. Rxc3+ Kd2 12. Rxc8
17-> 1:29 -2.13 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Kf4 Kxd4 6. Rh1 Kd3 7. Rh3+
Kd2 8. Bc1+ Kc2 9. Be3 b2 10. Bd4 b1=Q
11. Rxc3+ Kd2 12. Rxc8
18 2:34 -2.31 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Kf4 Kxd4 6. f3 Kd3 7. Rd1+
Kc4 8. Rb1 d4 9. Rc1 Kd5 10. Rd1 Bd7
18-> 3:04 -2.31 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Kf4 Kxd4 6. f3 Kd3 7. Rd1+
Kc4 8. Rb1 d4 9. Rc1 Kd5 10. Rd1 Bd7
19 6:36 -2.69 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Kf4 Kxd4 6. f3 Kd3 7. Rd1+
Kc4 8. Rc1 d4 9. Ke4 Bd7 10. Bb2 Bc6+
11. Kf4 Kb4 12. Ba1
19-> 8:33 -2.69 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Kf4 Kxd4 6. f3 Kd3 7. Rd1+
Kc4 8. Rc1 d4 9. Ke4 Bd7 10. Bb2 Bc6+
11. Kf4 Kb4 12. Ba1
20 12:14 ++ 1. cxb4!!
20-> 167:02 -2.30 1. cxb4 a4 2. b5+ Kxb5 3. Rb1 c3 4.
Ba3 Kc4 5. Kf4 Kxd4 6. f3 Kd3 7. Rd1+
Kc4 8. Rc1 d4 9. Ke4 Bd7 10. Bb2 Bc6+
11. Kf4 Kb4 12. Ba1
21 198:11 -2.38 1. cxb4 a4 2. b5+ Kxb5 3. Re2 c3 4.
Ba3 Kc4 5. f4 Kxd4 6. f5 exf5 7. e6
Kd3 <HT>
21-> 208:48 -2.38 1. cxb4 a4 2. b5+ Kxb5 3. Re2 c3 4.
Ba3 Kc4 5. f4 Kxd4 6. f5 exf5 7. e6
Kd3 <HT>
22 282:09 -2.28 1. cxb4 a4 2. b5+ Kxb5 3. Re2 c3 4.
Ba3 Kc4 5. f4 Kxd4 6. f5 exf5 7. e6
Kd3 8. e7 Bd7 9. e8=Q Bxe8 10. Rxe8
d4 11. Re5 Kd2 12. Re6 f4+ 13. Kxf4
(3) 22-> 308:42 -2.28 1. cxb4 a4 2. b5+ Kxb5 3. Re2 c3 4.
Ba3 Kc4 5. f4 Kxd4 6. f5 exf5 7. e6
Kd3 8. e7 Bd7 9. e8=Q Bxe8 10. Rxe8
d4 11. Re5 Kd2 12. Re6 f4+ 13. Kxf4
(2) 23 549:08 -2.15 1. cxb4 a4 2. b5+ Kxb5 3. Re2 c3 4.
Ba3 Kc4 5. f4 Kxd4 6. f5 exf5 7. e6
Kd3 8. e7 Bd7 9. e8=Q Bxe8 10. Rxe8
d4 11. Kf4 b2 12. Rb8 Kc2 13. Bxb2
cxb2
(2) 23-> 627:43 -2.15 1. cxb4 a4 2. b5+ Kxb5 3. Re2 c3 4.
Ba3 Kc4 5. f4 Kxd4 6. f5 exf5 7. e6
Kd3 8. e7 Bd7 9. e8=Q Bxe8 10. Rxe8
d4 11. Kf4 b2 12. Rb8 Kc2 13. Bxb2
cxb2
This offers another permutation to ponder (white's response 3. Re2 is not
considered elsewhere...)
Alex Szabo's pv went like this (after Rb4):
cxb4 a4 b5+ Kxb5 Ba3 c3 Re2! Kc4 f4 Kxd4 f5 exf5 ...
It appears that we have merely a transposition in the crafty analysis and that
of Szabo.
This line (and/or its transposition) deserves more scrutiny to be really sure if
it gives a true winning advantage or only results in a draw.
The other lines clearly win. This is the only one left in question, I think.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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