Author: pete
Date: 08:30:44 03/10/00
Go up one level in this thread
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
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