Author: Robert Hyatt
Date: 20:02:51 10/06/99
Go up one level in this thread
On October 06, 1999 at 19:55:00, John Stanback wrote: >On October 06, 1999 at 00:58:15, Robert Hyatt wrote: > >>On October 05, 1999 at 15:15:01, John Stanback wrote: >> >>>On October 05, 1999 at 01:14:03, Harald Faber wrote: >>> >>>>I remember I have heard that Junior has problems with "winning" pawns on a2/a7 >>>>and h2/h7. I couldn't imagine. Now I have seen it with my own eyes: >>>> >>>>[Event "Chessnet"] >>>>[Site "?"] >>>>[Date "????.??.??"] >>>>[Round "?"] >>>>[White "King 2.55"] >>>>[Black "Junior 5"] >>>>[Result "*"] >>>>[ECO "D49"] >>>>[PlyCount "43"] >>>> >>>>1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 >>>>a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Nxe5 12. Nxe5 axb5 13. Qf3 Bb4+ 14. Ke2 Rb8 >>>>15. Nc6 Bb7 16. Bf4 Qd7 17. Bxb5 O-O 18. Bxb8 Rxb8 19. Rhc1 Bd6 20. Kf1 Bxc6 >>>>21. Bxc6 Qa7 22. Rc2 * >>>> >>>>Now Junior5 takes the Ph2 and only is down with -1.00. After 23.g3 h5 (-1.32) >>>>24.Kg2 Ng4 (-1.40) 25.Rd1 Rf8 (-1.55) >>>> >>>>Black has some problems getting the bishop back into the game... >>>> >>>>So Uri, what does your latest Junior version (5.9?) play, also take the pawn? >>>> >>>>And I wonder which other programs take this pawn and which avoid this trap? >>> >>>Zarkov takes about 10 milliseconds to switch from Bxh2 to Rc8 :). >>> >>>John >> >> >>Crafty _never_ considers Bxh2: >> >> nss depth time score variation (1) >> 1 0.00 -2.19 22. ... Qc7 >> 1-> 0.00 -2.19 22. ... Qc7 >> 2 0.00 -2.32 22. ... Qc7 23. Qd3 >> 2 0.01 -2.31 22. ... Qa6+ 23. Kg1 d3 >> 2-> 0.01 -2.31 22. ... Qa6+ 23. Kg1 d3 >> 3 0.02 -2.48 22. ... Qa6+ 23. Kg1 Qc8 24. Qd3 >> 3 0.03 -2.31 22. ... Qc7 23. Qd3 Bb4 >> 3 0.03 -2.30 22. ... Qe7 23. Qd3 Be5 >> 3-> 0.03 -2.30 22. ... Qe7 23. Qd3 Be5 >> 4 0.04 -2.39 22. ... Qe7 23. Qd3 Be5 24. Kg1 >> 4 0.06 -2.35 22. ... Qc7 23. Qd3 Rb6 24. Bd5 >> 4-> 0.08 -2.35 22. ... Qc7 23. Qd3 Rb6 24. Bd5 >> 5 0.12 -2.33 22. ... Qc7 23. Qd3 Be5 24. Bd5 Qd6 >> >> >>It has an eval term to stop that nonsense. Many programs don't, still. > >The reason that Zarkov takes a 2 ply search is that my evaluation >term doesn't kick in until after the pawn moves to g3 trapping >the bishop. > >John aha... I check for the presence of the pawn on g3, and make sure (using SEE) that it isn't en prise. Then I zap the score... probably just as good to let the pawn get there first and save some time...
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.