Author: Uri Blass
Date: 00:36:00 02/08/01
Go up one level in this thread
On February 08, 2001 at 02:20:20, Ed Schröder wrote: >On February 07, 2001 at 14:55:22, Uri Blass wrote: > >>On February 07, 2001 at 14:12:34, Heiner Marxen wrote: >> >>>Finally, after nearly 11 days Chest completed the mate in 17 miniature, >>>as posted by José Antônio Fabiano Mendes on January 26, 2001 at 06:55:42. >>>(K7/600, 350MB hash) >>>[D]8/p7/8/2p5/p3Q3/K7/2r5/1k6 w - - >>> >>>Chest finds two solutions: Qe1+ and Qh1+. >>>The second key move spans a much smaller tree than the first: 60 lines >>>versus over 2 million lines (ouch). I have not yet analysed why it grew >>>sooo huge. Here are the PVs: >>> >>> 1.Qe1+ Rc1 Qe5 Rc2 >> >>I guess that the tree is huge because of the possible move 2...Kc2 3.Qe2+ Kc3 >>4.Qb2+ instead of 2...Rc2. >> >>I guess that chest found that 4.Qb2+ is enough for mate in 14 but I am not sure >>about it. >> >>Chess playing programs like the line 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1+ Rc1 4.Qd3+ Rc2 >>5.Qf1+ Rc1 6.Qb5+ Kc2 7.Qe2+ Kc3 8.Qb2+ when white get the same positionas after >>4.Qb2+ in the above line. >> >>Uri > > >I am trying Century 3.1 under Rebel-Tiger and it takes 1 hour and >10 minutes. > >Ed > >------------ >00:02 07.02 3.58 1.Qe1+ >00:02 07.02 3.58 1.Qe1+ >00:03 07.02 5.89 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kd3 9.Qxc1 Ke4 (2) > >00:03 08.00 5.89 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kd3 9.Qxc1 Ke4 (3) > >00:04 09.00 5.89 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kd3 9.Qxc1 a6 (4) > >00:07 10.00 6.55 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kc4 9.Qxc1 Kb5 10.Qf1 Ka5 (5) > >00:13 11.00 6.89 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kd3 9.Qxc1 c4 10.Qd1 Kc3 (10) > >00:27 12.00 7.06 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kd3 9.Qxc1 c4 10.Kxa4 c3 11.Qd1 > Kc4 (19) > >01:09 13.00 7.37 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kc4 9.Qxc1 Kb5 10.Qd1 (46) > >03:05 14.00 8.04 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 Kc3 > 8.Qb2 Kd3 9.Qxc1 (127) > >09:54 15.00 8.33 1.Qe1+ Rc1 2.Qd2 Rc2 3.Qd1 Rc1 4.Qd3 > Rc2 5.Qf1 Rc1 6.Qb5 Kc2 7.Qe2 (406) > >05:42 16.00 Mate in 14 moves 1.Qe1+ Rc1 Qd2 2.Rc2 Qd1 3.Rc1 Qd3 4.Rc2 > Qf1 5.Rc1 Qf5 6.Rc2 Qe4 7.a6 Qh1 > 8.Rc1 Qh7 9.Rc2 Qe4 10.a5 Qh1 11.Rc1 > Qh7 12.Ka1 (3942) I see that there is an error in writing the moves in the last line(1.Qe1+ Rc1 2.Qd2 should be written and the 2 is only for Rc2. The mate in 14 is also wrong 12...Ka1 is an error and better is 12...Rc2 when white needs more moves to mate. Uri
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