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.
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