Author: Robert Hyatt
Date: 13:55:45 01/19/01
Go up one level in this thread
On January 19, 2001 at 05:15:41, Uri Blass wrote:
>[D]8/8/p1r5/6k1/KP6/8/8/5R2 b - - 0 1
>
>In this position Rebel century3 blundered and played 66...Rb6 when white
>probably forces mate in 48(The main line is losing a tempo by 67.Rf2 Kg4 68.Rf8
>Kg5 69.Rf1 when Rebel to mope has to play a move that desroys black's position I
>did not learn the position to understand exactly why but I believe the main line
>of chess programs)
>
>How much time does your program need to find 66...Rc3 or 66...Rc2 that are
>probably enough for a draw(I am not sure and I may be wrong about it)?
>
>How much time does it need with tablebases and how much time does it need
>without tablebases?
>
>Uri
Crafty behaves as follows with tablebases:
(3) 15 50.19 0.79 1. ... Rb6 2. Rb1 Kf6 3. Ka5 Rc6 4.
Rh1 Ke7 5. Rh7+ Kd8 6. Rb7 Kc8 7. Rb6
Rc1 8. Rd6 Ra1+ 9. Kb6 Rb1 10. Kc5
15-> 52.63 0.79 1. ... Rb6 2. Rb1 Kf6 3. Ka5 Rc6 4.
Rh1 Ke7 5. Rh7+ Kd8 6. Rb7 Kc8 7. Rb6
Rc1 8. Rd6 Ra1+ 9. Kb6 Rb1 10. Kc5
16 1:13 0.76 1. ... Rb6 2. Rf3 Kg4 3. Rf8 Kg5 4.
Rf3 <HT>
(4) 16-> 1:52 0.76 1. ... Rb6 2. Rf3 Kg4 3. Rf8 Kg5 4.
Rf3 <HT>
(3) 17 2:03 0.76 1. ... Rb6 2. Rf3 Kg4 3. Rf8 Kg5 4.
Rf7 Rb8 5. Rf3 Rb6 <HT>
17 3:48 0.74 1. ... Rc3 2. Ka5 Ra3+ 3. Kb6 Rb3 4.
Kc5 Rc3+ 5. Kd4 Rb3 6. Kc4 Rb2 7. Kc5
Rc2+ 8. Kd4 Rd2+ 9. Kc3 Re2 10. Rf8
Re4 11. Kb3 Rd4 12. Rf7
17-> 4:08 0.74 1. ... Rc3 2. Ka5 Ra3+ 3. Kb6 Rb3 4.
Kc5 Rc3+ 5. Kd4 Rb3 6. Kc4 Rb2 7. Kc5
Rc2+ 8. Kd4 Rd2+ 9. Kc3 Re2 10. Rf8
Re4 11. Kb3 Rd4 12. Rf7
and it behaves as follows without tablebases:
(2) 16-> 1:27 1.29 1. ... Rb6 2. Rb1 Rc6 3. Ka5 Kf6 4.
Rd1 Ke7 5. Rh1 Rg6 6. Rh8 Kd6 7. Ra8
Rg5+ 8. Kxa6 Rg4 9. b5 Ra4+ 10. Kb7
Rxa8 11. Kxa8
17 1:44 1.29 1. ... Rb6 2. Rb1 Rc6 3. Ka5 Kf6 4.
Rd1 Ke7 5. Rh1 Rg6 6. Rh8 Rg1 7. Kxa6
Kd6 8. Kb6 Rg4 9. Rh6+ Kd5 10. b5
Black(0): d
(2) 17-> 3:19 1.29 1. ... Rb6 2. Rb1 Rc6 3. Ka5 Kf6 4.
Rd1 Ke7 5. Rh1 Rg6 6. Rh8 Rg1 7. Kxa6
Kd6 8. Kb6 Rg4 9. Rh6+ Kd5 10. b5
18 4:11 1.29 1. ... Rb6 2. Rb1 Rc6 3. Ka5 Kf6 4.
Re1 Kf7 5. Rh1 Kg7 6. Rh2 Re6 7. Rc2
Rd6 8. Rc8 Kf6 9. Ra8 Rd5+ 10. Kxa6
Ke6
ok.
(3) 18-> 8:49 1.29 1. ... Rb6 2. Rb1 Rc6 3. Ka5 Kf6 4.
Re1 Kf7 5. Rh1 Kg7 6. Rh2 Re6 7. Rc2
Rd6 8. Rc8 Kf6 9. Ra8 Rd5+ 10. Kxa6
Ke6
IE with no tablebases it sticks with Rb6.
If I play Rb6 then after 17 plies the score is still ok, so it will take me
at least 19 plies total to see that Rb6 loses, if it does.
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