Author: Sune Larsson
Date: 17:45:24 03/01/01
Go up one level in this thread
On March 01, 2001 at 20:05:59, Robert Hyatt wrote:
>On March 01, 2001 at 18:28:14, Sune Larsson wrote:
>
>>On March 01, 2001 at 18:17:05, Dann Corbit wrote:
>>
>>>On March 01, 2001 at 17:42:57, Sune Larsson wrote:
>>>
>>>>
>>>> [D]4B3/5K2/5P1b/2p5/2p5/1k6/8/8 w - - 0 1
>>>>
>>>> A. Selesniew, 1921
>>>>
>>>>
>>>> So few pieces and so tricky! Here we need the Deep ones at their best!
>>>> Maybe also Diep? If you play this one out you sure will get dizzy!
>>>>
>>>> Test: White to move and draw. Not many choices - the black pawns
>>>> are on the run.
>>>
>>>Crafty does not see the draw. I also would choose Ke6. So, I am wondering,
>>>what *is* the right move and why?
>>
>> The right move is 1.Kg6! and it's about making the black bishop dizzy.
>> But this one is real tricky - and yet the pieces few...
>>
>>>
>>>White(1): setboard 4B3/5K2/5P1b/2p5/2p5/1k6/8/8 w - -
>>>White(1): go
>>>end-game phase
>>> clearing hash tables
>>> time surplus 0.00 time limit 16:39 (16:39)
>>> nss depth time score variation (1)
>>> 9 0.14 -2.04 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Bd6 6. f7 Bf8
>>> 9-> 0.17 -2.04 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Bd6 6. f7 Bf8
>>> 10 0.30 -2.26 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. Kd5 Ke3
>>> 10 0.55 -2.11 1. Bc6 c3 2. Be4 Bg5 3. Ke6 Bxf6 4.
>>> Kd5 c4 5. Kc5 Be5
>>> 10-> 0.62 -2.11 1. Bc6 c3 2. Be4 Bg5 3. Ke6 Bxf6 4.
>>> Kd5 c4 5. Kc5 Be5
>>> 11 1.05 -2.45 1. Bc6 c3 2. Be4 c4 3. Kg6 Be3 4. f7
>>> Bc5 5. Kf5 c2 6. Bxc2+ Kxc2 7. Ke4
>>> Bf8
>>> 11 1.22 -2.26 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. Kd5 Ke3 7. Ke5
>>> 11-> 1.34 -2.26 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. Kd5 Ke3 7. Ke5
>>> 12 1.74 -2.43 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. f7 Ke3 7. Kd5
>>> Kd3 <HT>
>>> 12-> 2.04 -2.43 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. f7 Ke3 7. Kd5
>>> Kd3 <HT>
>>> 13 2.32 -- 1. Ke6
>>> 13 11.35 -2.45 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. f7 Be7 7. Kd5
>>> Kd3 8. Ke5 c4
>>> 13-> 12.00 -2.45 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. f7 Be7 7. Kd5
>>> Kd3 8. Ke5 c4
>>> 14 12.38 -- 1. Ke6
>>> 14 42.40 -2.68 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. f7 Ke2 7. Kc3
>>> Ke3 8. Kc4 <HT>
>>> 14-> 43.71 -2.68 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. f7 Ke2 7. Kc3
>>> Ke3 8. Kc4 <HT>
>>> 15 44.34 -- 1. Ke6
>>> 15 3:35 -4.39 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. Kb3 Kd3 7. Ka3
>>> c4+ 8. Ka2 c3 9. f7 c2 10. Kb2
>>> 15-> 3:39 -4.39 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. Kb3 Kd3 7. Ka3
>>> c4+ 8. Ka2 c3 9. f7 c2 10. Kb2
>>> 16 3:48 -4.55 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. Kb3 Kd3 7. Kb2
>>> c4 8. Kc1 c3 9. Kd1 Bc5
>>> 16-> 4:03 -4.55 1. Ke6 c3 2. Bg6 c2 3. Bxc2+ Kxc2 4.
>>> Kd5 Bf8 5. Kc4 Kd2 6. Kb3 Kd3 7. Kb2
>>> c4 8. Kc1 c3 9. Kd1 Bc5
>>> 17 4:06 -- 1. Ke6
>>> time=16:39 cpu=99% mat=-1 n=686397929 fh=22% nps=686844
>>> ext-> chk=87034513 cap=0 pp=1227509 1rep=3202169 mate=64048
>>> predicted=0 nodes=686397929 evals=50290241
>>> endgame tablebase-> probes done=9115 successful=9115
>
>
>I tried this with crafty on my xeon and _all_ I get is Kg6. Maybe because
>I have all the tablebases ??
Okey, 1.Kg6! is correct and the line after 1.-c3 is a draw.
Try also 1.Kg6 *Bf4* cause we want to see that merry-go-round ;)
>
> 17-> 35.71 -4.60 1. Kg6 c3 2. Kxh6 c2 3. f7 c1=Q+ 4.
> Kg6 Qf4 5. Kg7 Qd4+ 6. Kg8 Qg4+ 7.
> Kh8 Qh5+ 8. Kg7 Qg5+ 9. Kh7 Qf6 10.
> Kg8 Qg6+ 11. Kh8 Qd6 12. Kg7 Qe5+ 13.
> Kh7 Qf4
> 18 59.12 -4.60 1. Kg6 c3 2. Kxh6 c2 3. f7 c1=Q+ 4.
> Kg6 Qf4 5. Kg7 Qd4+ 6. Kg8 Qg4+ 7.
> Kh8 Qh5+ 8. Kg7 Qg5+ 9. Kh7 Qf6 10.
> Kg8 Qe6 11. Kh8 Qh3+ 12. Kg7 Qc3+ 13.
> Kg8 Qg3+ 14. Kh7 Qf4
> 18-> 1:08 -4.60 1. Kg6 c3 2. Kxh6 c2 3. f7 c1=Q+ 4.
> Kg6 Qf4 5. Kg7 Qd4+ 6. Kg8 Qg4+ 7.
> Kh8 Qh5+ 8. Kg7 Qg5+ 9. Kh7 Qf6 10.
> Kg8 Qe6 11. Kh8 Qh3+ 12. Kg7 Qc3+ 13.
> Kg8 Qg3+ 14. Kh7 Qf4
> 19 2:04 -4.58 1. Kg6 c3 2. Kxh6 c2 3. f7 c1=Q+ 4.
> Kg6 Qf4 5. Kg7 Qd4+ 6. Kg8 Qg4+ 7.
> Kh8 Qh5+ 8. Kg7 Qg5+ 9. Kh7 Qf6 10.
> Kg8 Qe6 11. Kh8 Qh3+ 12. Kg7 Qg2+ 13.
> Kh8 Qf2 14. Kg8 Qg2+ 15. Kh7
>
>It starts with Kg6 at ply 8, the first ply it displays, and it sticks
>with it from then on... but it doesn't see a draw, just a +bunch+ of
>checks...
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