Author: Robert Hyatt
Date: 20:14:09 03/10/00
Go up one level in this thread
On March 10, 2000 at 11:30:44, pete wrote:
>On March 09, 2000 at 06:22:27, Heiner Marxen wrote:
>
>>>I am still interested though that if Bringer said mate in 18 is it sure it also
>>>can reach it ?
>>
>>That I don't know for sure: the author of Bringer could know that.
>>But I suspect that an announced mate *is* a forced mate, just the same
>>way others do it, also.
>>
>>After 10 hours of crunching on a PIII/550 with 500MB hash table
>>Chest 3.19 states "no mate in 16". Somewhere in the search there
>>have been some partial "mate in 13", so a mate in 18 appears plausible
>>to me. May be there is no shorter mate at all, which lets me wonder
>>how Bringer managed to find this mate... respect.
>>
>>Heiner Marxen heiner@drb.insel.de http://www.drb.insel.de/~heiner/
>
>As I still was curious I fed it again in crafty , this time on a faster system
>with no tablebases ; the result was quite strange :
>
>book file disabled.
>pondering disabled.
>playing a computer!
>hash table memory = 384M bytes.
>pawn hash table memory = 64M bytes.
>max threads set to 4
>
>Crafty v17.9 (4 cpus)
>
>White(1): setboard 8/8/5p2/5p2/5P2/3p3B/5k1P/3K4 w
>
> +---+---+---+---+---+---+---+---+
> 8 | | | | | | | | |
> +---+---+---+---+---+---+---+---+
> 7 | | | | | | | | |
> +---+---+---+---+---+---+---+---+
> 6 | | | | | | *P| | |
> +---+---+---+---+---+---+---+---+
> 5 | | | | | | *P| | |
> +---+---+---+---+---+---+---+---+
> 4 | | | | | | P | | |
> +---+---+---+---+---+---+---+---+
> 3 | | | | *P| | | | B |
> +---+---+---+---+---+---+---+---+
> 2 | | | | | | *K| | P |
> +---+---+---+---+---+---+---+---+
> 1 | | | | K | | | | |
> +---+---+---+---+---+---+---+---+
> a b c d e f g h
>
>White(1): analyze
>end-game phase
> clearing hash tables
> time surplus 0.00 time limit 30.00 (3:00)
> nss depth time score variation (1)
>starting thread 1
>starting thread 2
>starting thread 3
>
>...
>
> 24 7:40 ++ 1. Bg2!!
> 24 20:41 10.11 1. Bg2 Kxg2 2. h4 Kf3 3. h5 Kxf4 4.
> h6 d2 5. h7 Kg5 6. h8=Q Kg4 7. Qxf6
> Kf4 8. Kxd2 Ke4 9. Qe6+ Kd4 10. Qxf5
> Kc4 11. Qe5 Kb4 12. Qd5 Ka3 13. Qb5
> Ka2 14. Kc3
> 24-> 24:09 10.11 1. Bg2 Kxg2 2. h4 Kf3 3. h5 Kxf4 4.
> h6 d2 5. h7 Kg5 6. h8=Q Kg4 7. Qxf6
> Kf4 8. Kxd2 Ke4 9. Qe6+ Kd4 10. Qxf5
> Kc4 11. Qe5 Kb4 12. Qd5 Ka3 13. Qb5
> Ka2 14. Kc3
>bad move from hash table, ply=24
> 25 49:14 ++ 1. Bg2!!
> (2) 25-> 169:09 10.50 1. Bg2 Kxg2 2. h4 Kf3 3. h5 Kxf4 4.
> h6 d2 5. h7 Kg5 6. h8=Q Kg4 7. Qxf6
> Kf4 8. Kxd2 Ke4 9. Qe6+ Kd4 10. Qxf5
> Kc4 11. Qe5 Kb4 12. Qd5 Ka3 13. Qb5
> Ka2 14. Kc3
> 26 202:48 ++ 1. Bg2!!
> 26-> 311:56 10.89 1. Bg2 Kxg2 2. h4 Kf3 3. h5 Kxf4 4.
> h6 d2 5. h7 Kg5 6. h8=Q Kg4 7. Qxf6
> Kf4 8. Kxd2 Ke4 9. Qe6+ Kd4 10. Qxf5
> Kc4 11. Qe5 Kb4 12. Qd5 Ka3 13. Qb5
> Ka2 14. Kc3
> 27 369:56 ++ 1. Bg2!!
> 27 693:33 Mat150 1. Bg2 Kxg2 2. h4 Kf3 3. h5 Kxf4 4.
> h6 Kf3 5. h7 Ke4 6. h8=Q Ke5 7. Qe8+
> Kd4 8. Qf7 Kc5 9. Qxf6 f4 10. Qe5+
> Kb6 11. Qxf4 Kb7 12. Qe4+ Kb6 13. Qe3+
> Ka6 14. Kd2 Ka5 15. Qh6 Kb4 16. Qh5
> <HT>
> 27-> 846:32 Mat150 1. Bg2 Kxg2 2. h4 Kf3 3. h5 Kxf4 4.
> h6 Kf3 5. h7 Ke4 6. h8=Q Ke5 7. Qe8+
> Kd4 8. Qf7 Kc5 9. Qxf6 f4 10. Qe5+
> Kb6 11. Qxf4 Kb7 12. Qe4+ Kb6 13. Qe3+
> Ka6 14. Kd2 Ka5 15. Qh6 Kb4 16. Qh5
> Ka3 <HT>
> 28 919:01 Mat150 1. Bg2 Kxg2 2. h4 Kf3 3. h5 Kxf4 4.
> h6 Kf3 5. h7 Ke4 6. h8=Q Ke5 7. Qe8+
> Kd4 8. Qf7 Kc5 9. Qg8 f4 10. Qf8+ Kc4
> 11. Qh8 d2 12. Kxd2 Kb5 13. Qb8+ Kc5
> 14. Kd3 f3 15. Qc7+ Kd5 16. Qd7+ Kc5
> <HT>
>
>Mate in 150 , wow :-)) .
>
>pete
Here is 'crafty' output from my quad xeon, using all 3-4-5 piece tablebases
(no sixes).
20 1:43 ++ 1. Bg2!!
20 3:31 10.19 1. Bg2 Ke3 2. h4 Kxf4 3. Bf3 Ke5 4.
h5 Ke6 5. Bd5+ Ke7 6. h6 Kf8 7. Kd2
f4 8. Kxd3 f5 9. Ke2 Ke7 10. h7 Kf6
11. h8=Q+ Kg5 12. Bf3
20-> 3:47 10.19 1. Bg2 Ke3 2. h4 Kxf4 3. Bf3 Ke5 4.
h5 Ke6 5. Bd5+ Ke7 6. h6 Kf8 7. Kd2
f4 8. Kxd3 f5 9. Ke2 Ke7 10. h7 Kf6
11. h8=Q+ Kg5 12. Bf3
21 3:49 ++ 1. Bg2!!
21-> 6:43 10.58 1. Bg2 Ke3 2. h4 Kxf4 3. Bf3 Ke5 4.
h5 Ke6 5. Bd5+ Ke7 6. h6 Kf8 7. Kd2
f4 8. Kxd3 f5 9. Ke2 Ke7 10. h7 Kf6
11. h8=Q+ Kg5 12. Bf3
22 6:55 ++ 1. Bg2!!
22 15:08 Mat25 1. Bg2 Ke3 2. h4 Kxf4 3. Bf3 Ke5 4.
h5 Ke6 5. Bd5+ Ke7 6. h6 Kf8 7. Kd2
f4 8. Kxd3 f5 9. Be6 f3 10. Ke3 Ke7
11. Kxf3 <HT>
22-> 16:43 Mat25 1. Bg2 Ke3 2. h4 Kxf4 3. Bf3 Ke5 4.
h5 Ke6 5. Bd5+ Ke7 6. h6 Kf8 7. Kd2
f4 8. Kxd3 f5 9. Be6 f3 10. Ke3 Ke7
11. Kxf3 <HT>
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.