Author: Ed Schröder
Date: 08:18:58 05/28/00
Go up one level in this thread
On May 28, 2000 at 04:17:41, Jeremiah Penery wrote: >On May 28, 2000 at 02:37:33, Ed Schröder wrote: > >>On May 28, 2000 at 00:38:15, Eelco de Groot wrote: >> >>>Can White actually promote the g-pawn? >> >>I am not sure if Kg3 is winning. On the other hand if Capablanca >>say so. The latest engine running under ECTOOL6 (beta) find Kg3 >>much quicker. Don't ask me why as I can't remember to have made >>any changes here. But perhaps it is search related and here a lot >>has changed. >> >>00:00 08.01 0.51 1.Ke2 Rxc3 2.Rd7 Rc2+ 3.Kd3 Ra2 4.Rxd5 Rxa4 5.Rxf5 >>00:01 09.00 0.51 1.Ke2 Rxc3 2.Rd7 Rc2+ 3.Kd3 Ra2 4.Rxd5 Rxa4 5.Rxf5+ Kg7 >>00:02 10.00 0.39 1.Ke2 Rxc3 2.Rd7 Ra3 3.Rxd5 Rxa4 4.Rxf5+ Kg7 5.Rd5+ c6 >>00:06 11.00 0.40 1.Ke2 Rxc3 2.Rd7 c6 3.Rxa7 Rc4 4.a5 bxa5 5.Kd3+ a4 6.Ke3 >>00:17 12.00 0.32 1.Ke2 Rxc3 2.Rd7 c6 3.Rxa7 Rc4 4.a5 bxa5 5.Ke3 a4 6.Kd3 c5 >>00:45 13.00 0.31 1.Ke2 Rxc3 2.Rd7 c6 >>02:00 14.00 0.31 1.Ke2 Rxc3 2.Rd7 >>03:16 14.02 0.38 1.Kg3 Rxc3+ 2.Kh4 Ra3 3.g6 Rxa4 4.Kg5 Rc4 5.Rf7+ >>07:48 15.00 0.35 1.Kg3 Kg8 2.Rd7 Rxc3+ 3.Kh4 Rf3 4.g6 Rxf4+ 5.Kg5 Re4 6.Rxd5 >>19:48 16.00 0.73 1.Kg3 Kg8 2.Rd7 Rxc3+ 3.Kh4 Rf3 4.g6 Rxf4+ 5.Kg5 Re4 6.Rxd5 >>c5 7.dxc5 bxc5 >> >>Tested while reading CCC on a Athlon 600 and 60 Mb hash. > >Here's my last output from a slightly modified Crafty 17.10: > >19 140:05 1.42 1. Kg3 Rxc3+ 2. Kh4 a6 3. g6 b5 4. > axb5 axb5 5. Rf7+ Kg8 6. Rxf5 Kg7 7. > Rxd5 Kxg6 8. Rxb5 Rc4 9. Rd5 c6 10. > Rd8 Kf5 11. Rf8+ Ke4 > >It liked Kg3 from iteration 15, with an ever-increasing score. > >On another note, in response to your (Ed's) post about the difficulty of "The DB >position", where he said something like "To truly appreciate the difficulty of >this position, search after all the quiet moves, and see if your program can >find 60. ...Qc1. Here's what the same Crafty finds after a long time: > >(The move numbers should begin with ...48 here, so 60 should be where 13 is.) >20-> 887:24 -0.87 1. ... Qc1+ 2. Kf2 Qd2+ 3. Be2 Qf4+ > 4. Kg1 Qe3+ 5. Kh2 Qf4+ 6. Kh3 Qxf5+ > 7. Kh2 Qf4+ 8. Kg1 Qc1+ 9. Kf2 Qf4+ > 10. Ke1 Qc1+ 11. Bd1 Qxc3+ 12. Kf1 > Qc1 13. Ra7+ Kg6 14. Ke2 c3 15. Qd7 >21 1307:00 1/30 1. ... Qc1+ > >21 1654:58 ++ 1. ... Qc1+!! >21 2223:06 0.00 1. ... Qc1+ 2. Kf2 Qd2+ 3. Kg3 Qe1+ > 4. Kh3 Qh1+ 5. Kg3 Qe1+ >21-> 2223:06 0.00 1. ... Qc1+ 2. Kf2 Qd2+ 3. Kg3 Qe1+ > 4. Kh3 Qh1+ 5. Kg3 Qe1+ > >I suppose since it found some sort of draw, it just outputted a short one, for >some reason. I rather don't like that, so I moved forward a few more moves from >Ed's given line, and I got: > >(This should begin with move ...53.) >17-> 77:30 -0.09 6. ... Qxf5+ 7. Kh2 Qf4+ 8. Kg1 Qe3+ > 9. Kf1 Qc1+ 10. Kf2 Qf4+ 11. Ke1 Qc1+ > 12. Bd1 Qxc3+ 13. Kf1 Qc1 14. Ra7+ > Kg6 15. Ke2 c3 16. Qd7 >18 128:48 0.00 6. ... Qxf5+ 7. Kh2 Qf4+ 8. Kg1 Qe3+ > 9. Kf1 Qc1+ 10. Kf2 Qf4+ 11. Ke1 Qc1+ > 12. Bd1 Qxc3+ 13. Kf1 Qc1 14. Ra7+ > Kg6 15. Ke2 Qb2+ 16. Kf1 Qc1 >18-> 134:45 0.00 6. ... Qxf5+ 7. Kh2 Qf4+ 8. Kg1 Qe3+ > 9. Kf1 Qc1+ 10. Kf2 Qf4+ 11. Ke1 Qc1+ > 12. Bd1 Qxc3+ 13. Kf1 Qc1 14. Ra7+ > Kg6 15. Ke2 Qb2+ 16. Kf1 Qc1 > >So it does eventually find Qc1, and it extends Ed's line by 2 moves by playing >Ra7+ - this pushes the draw out even further. :-/ Wow so the draw is even deeper. Thanks for the (long) investigation. Ed >Jeremiah
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