Author: Robert Hyatt
Date: 19:53:40 03/10/00
Go up one level in this thread
On March 10, 2000 at 13:12:25, blass uri wrote: >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 > >I do not believe that crafty can see mate in 150 with no tablebases. >Even with tablebases I expect shorter mates. > >It seems that this Mate in 150 is a bug in crafty. > >Uri nope. Max mate it can see (search only) is a mate in 32 (64 plies.). It can, of course, see mates in 150+ with tablebases + search, and that is possible here (ie a forced trade into a hard tablebase mate can produce such nonsense scores).
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