Author: Ed Schröder
Date: 23:20:20 02/07/01
Go up one level in this thread
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)
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