Author: Steffen Jakob
Date: 02:31:08 09/28/00
Go up one level in this thread
On September 28, 2000 at 04:21:19, Andrew Williams wrote:
>On September 27, 2000 at 20:03:27, Peter McKenzie wrote:
>
>>On September 27, 2000 at 17:16:21, Andrew Williams wrote:
>>
>>>On September 27, 2000 at 04:45:38, Eduard Nemeth wrote:
>>>
>>>>[D]8/8/p3R3/1p5p/1P5p/6rp/5K1p/7k w - - 0 1
>>>>
>>>>Shredder 4 and Fritz 6a this don't find !
>>>>
>>>>Eduard
>>>
>>>PostModernist finds this easily enough:
>>>
>>>9= +M07 2 102865 1. Re1 Rg1 2. Rf1 a5 3. bxa5 b4 4. a6 b3 5. a7 Rxf1
>>>6. Kxf1 b2 7. a8=Q
>>>
>>>ie 2 seconds, 102865 nodes.
>>
>>LambChop didn't find it, it looks like a nullmove problem to me.
>>After 1.Re1+ Rg1 2.Rf1 black just nullmoves, so the zugzwang is not detected.
>>
>>I guess you don't nullmove in Rook endings?
>>
>
>Correct.
I do nullmoves in rook endings but have a special Zugzwang detection if the side
which wants to make the nullmove has only one piece left. The latest version of
Hossa finds it quickly:
depth value time nodes pv
1 -5.64 0.00 2 1.e6xa6
<1> -5.64 0.00 21 1.e6xa6
2 -5.67 0.00 46 1.e6xa6 g3g7
<2> -5.67 0.01 155 1.e6xa6 g3g7
3 -5.60 0.01 233 1.e6xa6 g3g2 2.f2f3
<3> -5.60 0.01 323 1.e6xa6 g3g2 2.f2f3
4 -5.70 0.01 531 1.e6xa6 g3g2 2.f2f1 g2g7
<4> -5.70 0.02 1026 1.e6xa6 g3g2 2.f2f1 g2g7
5 -5.32 0.03 1744 1.e6xa6 g3g4 2.a6a1 g4g1 3.a1a2
! 5 -5.06 0.03 1923 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5
! <5> -5.06 0.04 2631 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5
6 -5.15 0.05 2974 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
<6> -5.15 0.06 4158 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
7 -4.91 0.07 4667 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3
<7> -4.91 0.08 5922 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3
! 8 -4.42 0.09 6558 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3 5.a7
! <8> -4.42 0.09 6606 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3 5.a7
9 -4.27 0.09 7019 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3 5.a7 g1xf1 6.f2xf1
<9> -4.27 0.09 7067 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3 5.a7 g1xf1 6.f2xf1
! 10 #7 0.10 8107 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3 5.a7 g1xf1 6.f2xf1 b2
7.a7a8Q
! <10> #7 0.13 10157 1.e6e1 g3g1 2.e1f1 a5 3.b4xa5 b4
4.a6 b3 5.a7 g1xf1 6.f2xf1 b2
7.a7a8Q
Greetings,
Steffen.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.