Author: Robert Hyatt
Date: 05:45:54 02/04/00
Go up one level in this thread
On February 04, 2000 at 02:13:20, Jeremiah Penery wrote: >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: remember that (a) my disks are _extreme_. 10K/80mbytes/sec drives. And I run with a big hash, which helps here (hash=384M). And I use 4 cpus of course. :) > >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. No idea there. > >>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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