Author: Jeremiah Penery
Date: 23:13:20 02/03/00
Go up one level in this thread
On February 04, 2000 at 00:02:09, Robert Hyatt wrote:
>On February 03, 2000 at 17:08:37, Amir Ban wrote:
>
>>
>>There's an article by Nunn & Friedel in the latest ICCAJ called "Brains of the
>>Earth" on a contest to solve 6 very hard king & pawn endings. The article says
>>solving this suite in 24 hours was an exceptional achievement, and Kasparov made
>>an amazing achievement of solving it in 45 minutes. It's also possible to
>>understand from the article that Hiarcs could not solve the set.
>>
>>So I set up the EPD, intending to let Junior think about it all night, but I was
>>surprised to find that Junior (no tablebases) can find all 6 key moves in less
>>than 2 minutes each.
>>
>>Here is the EPD:
>>
>>6k1/6p1/8/4K1P1/8/7P/8/8 w - - ; bm Kf4;
>>k7/4p3/4p3/8/8/3P1P2/5P2/K7 w - - ; bm Kb2;
>>8/4p3/2kp4/4p3/6K1/5P2/3P4/8 w - - ; bm Kg5;
>>k7/8/1p6/p1p5/2P4K/8/PP6/8 w - - ; bm a4;
>>8/8/p7/8/1P6/7p/P4k1P/3K4 w - - ; bm a3;
>>8/5p1p/8/6k1/8/6P1/5PP1/7K w - - ; bm Kh2;
>>
>>I don't quite understand it.
>>
>>Amir
>
>position 2:
>
>I think this must be obvious. Kb2 is the _only_ move I get. My first output
>is at ply=14, with Kb2 as the move. I stopped it at depth=28, 30 seconds,
>move was still Kb2, eval still +1.5
This is strange... Here's what I'm getting:
18-> 46.18 1.94 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kf5 7. Kd4 e6
8. Ke3 Kg6 9. Ke4 Kf7
19 48.41 ++ 1. Kb2!!
19 2:16 2.98 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kf5 7. Kd4 Kg4
8. Ke4 Kh3 9. f5 Kg4 10. f4 <HT>
19-> 2:17 2.98 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kf5 7. Kd4 Kg4
8. Ke4 Kh3 9. f5 Kg4 10. f4 <HT>
20 3:44 2.98 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kf5 7. Kd4 Kg4
8. Ke4 Kh3 9. f5 Kg4 10. f4 Kg3
20-> 3:50 2.98 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kf5 7. Kd4 Kg4
8. Ke4 Kh3 9. f5 Kg4 10. f4 Kg3
21 3:58 ++ 1. Kb2!!
21 9:16 3.54 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kf5 7. Kc5 Kg6
8. Kc6 Kg7 9. f5 Kh6 10. f6 e6 <HT>
21-> 9:19 3.54 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kf5 7. Kc5 Kg6
8. Kc6 Kg7 9. f5 Kh6 10. f6 e6 <HT>
22 9:25 ++ 1. Kb2!!
I'm not sure quite why it's taking so long (My HD is going crazy with TB probes,
and it probably is a fairly slow drive, but I don't see why it's making this
take _this_ long...). I'm also not sure why I'm getting such a high score, when
everyone else is getting much lower scores.
>position 3:
>
>Kg5 is the only move I get from the first printed output thru 25 plies. Score
>is -1.0, but no other move ever shows up as better...
I get similar results here. :(
>position 4:
>
>a4 is also the only move I get, from the first output at 14 plies thru 27 plies
>where I stopped it. eval=.36, so it isn't crushing... but it does agree with
>the move.
Same here...
>position 5
>
>a3 is found instantly. And it is crushing. By ply 24, 30 seconds, score is +7
>and climbing every iteration.
Yuck. It takes my computer about 3 minutes to find a3 on ply 16. After that,
the plies go fairly quickly and the score rises a bunch.
>position 6.
>
>The first "hard" one (one that takes over a few milliseconds to get the
>suggested best move). Crafty likes Kg1 until depth 22, 20 seconds. At
>that point it switches to Kh2 and sticks with it.
I'm getting Kh2 from ply 13 on (10 seconds), but it is not finding the best
continuation of 2. Kh1 in reasonable time (a couple minutes :).
All my times/scores are from a Modified Crafty 17.7 on a PII-300, using (at
least) the KPPKP TB. I'll also run the harder ones (2,3,4,6) without TBs, and
see what I get...
2) 24-> 57.58 1.23 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kxf4 7. Kd5 Kf5
8. f3 Kg5 9. Ke4 e6 10. f4+ Kg4 11.
Ke3 Kf5 12. Kf3 Kg6 13. Ke4
25 2:01 ++ 1. Kb2!!
25-> 13:17 1.62 1. Kb2 Kb7 2. Kc3 e5 3. d4 Kc6 4. dxe5
Kd5 5. f4 Ke4 6. Kc4 Kxf4 7. Kd5 Kf5
8. f3 Kg5 9. Ke4 e6 10. f4+ Kg4 11.
Ke3 Kf5 12. Kf3 Kg6 13. Ke4
Hardly convincing, but the score may continue to rise...I'll have to let these
run longer to see.
3) 22-> 4:08 -0.32 1. Kg5 d5 2. Kf5 Kd6 3. d3 d4 4. Kg6
Kc5 5. Kf5 Kd5 6. Kg6 Kd6 7. Kf7 Kd7
8. Kg6 Kc6 9. Kf7 e4 10. fxe4 Kd6 11.
Kg6 e5
I think this is going to end up in a draw score, like Dann was getting.
4) 21 1:01 0.00 1. a4 Kb8 2. Kg5 Kc7 3. Kf5 Kd6 4.
Kf4 Ke6 5. Ke4 Kd6 6. Kf3 Kc7 7. Kf4
Kd6 8. Kf3
6) 21 1:37 0.82 1. Kh2 f6 2. Kg1 h5 3. Kf1 Kf5 4. f3
Ke6 5. g4 hxg4 6. fxg4 Ke5 7. g3 Kd4
8. Kf2 Ke4 9. Ke2 <HT>
I'm really going to have to let these things search overnight, maybe with TBs,
to see if I can get anything interesting...
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