Author: John Stanback
Date: 16:55:00 10/06/99
Go up one level in this thread
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
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