Author: Andrew Dados
Date: 11:10:27 03/11/00
Go up one level in this thread
On March 10, 2000 at 22:53:40, Robert Hyatt wrote: >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). Just above crafty analysis pete stated: 'no tablebases', so search result looks like a bug.
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