Author: Robert Hyatt
Date: 13:13:37 07/09/99
I was doing some testing today, and happened to pick wac230 as one of several
test cases to do some profiling with. I was quite surprised to get the
following on my quad xeon:
15-> 25.00 1.76 1. ... Rh7 2. Rb1 a4 3. Ba3 Bb7 4.
Kf4 Kd7 5. f3 Bc6 6. Rb2 Rh1 7. Bd6
Rc1 8. Bb4 Rh1 <HT>
16 37.14 1.77 1. ... Rh7 2. Rb1 a4 3. Bc5 Rh5 4.
Kg4 Ba6 5. Bd6 Bb7 6. Ra1 Kb5 7. Rb1
Rh2 8. Kg3 Rh5 <HT>
16 0:59 ++ 1. ... Rb4!!
(2) 16-> 1:28 2.15 1. ... Rb4
17 2:08 1.94 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rb1 c3 5. Ba3 Kc4 6. Rh1 Bd7 7. Rd1
c2 8. Rd2 Kc3 9. Bc1 a3 10. Rxc2+ bxc2
11. Bxa3 Kxd4
17-> 2:11 1.94 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rb1 c3 5. Ba3 Kc4 6. Rh1 Bd7 7. Rd1
c2 8. Rd2 Kc3 9. Bc1 a3 10. Rxc2+ bxc2
11. Bxa3 Kxd4
18 3:29 ++ 1. ... Rb4!!
18 6:47 2.88 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rb1 c3 5. Ba3 Kc4 6. Kg4 Kxd4 7. Rc1
Kd3 8. Rd1+ Kc2 9. Rc1+ Kd2 10. Rh1
Ke2 <HT>
18-> 6:54 2.88 1. ... Rb4 2. cxb4 a4 3. b5+ Kxb5 4.
Rb1 c3 5. Ba3 Kc4 6. Kg4 Kxd4 7. Rc1
Kd3 8. Rd1+ Kc2 9. Rc1+ Kd2 10. Rh1
Ke2 <HT>
This is the first time Crafty has found this position... and as a result, it
can now find all 300 within 60 seconds, for the first time (it has been 'stuck'
on 299 for a year).
I remembered Jouni asking about this position a while back. now the answer is
'yes' someone can get this one. Cray Blitz got it very quickly, but because of
some eval differences + singular extensions. It is now just within Crafty's
grasp (although there is no guarantee it won't become impossible again as I
make other changes..:) )
Bob
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