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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