Author: Bob Durrett
Date: 13:42:20 03/14/04
Go up one level in this thread
On March 14, 2004 at 13:25:19, Russell Reagan wrote: >On March 14, 2004 at 12:54:31, Michael Nolan wrote: > >>PV? Is that Position Value? When you say that Shredder's PV has a credibility >>problem, could you elaborate? Did you mean that none of the engines display a >>PV when in Automatic Analysis? Or just for Junior? Thanks, Bob, sorry for my >>inexperience with these terms. >>Mike Nolan > >PV means principle variation, or primary variation. In other words, it's the >main line. Shredder has been known to produce very good first moves, but the >rest of the moves are kind of silly sometimes. For instance, consider this game: > >[Event ""] >[Site ""] >[Date "2004.03.14"] >[Round "?"] >[White "-"] >[Black "-"] >[Result "1-0"] > >1. d4 d5 2. Nf3 Nf6 3. e3 e6 4. Bd3 Bd6 5. O-O O-O 6. Re1 c5 7. c3 Nc6 8. Nbd2 >c4 9. Bc2 Bd7 10. e4 dxe4 11. Nxe4 Nxe4 12. Bxe4 Re8 13. Bxh7+ Kxh7 14. Ng5+ >Kh8 15. Qh5+ Kg8 16. Qxf7+ Kh8 17. Qh5+ Kg8 18. Qh7+ Kf8 19. Qh8+ Ke7 20. Qxg7# >1-0 > >After black's 14th move, white has a mate in 6. Here is what Fritz thinks about >this. > >[D]r2qr2k/pp1b1pp1/2nbp3/6N1/2pP4/2P5/PP3PPP/R1BQR1K1 w - - 0 1 > >Analysis by Fritz 8: > >15.Qh5+ Kg8 16.Qxf7+ Kh8 17.Qh5+ Kg8 18.Qh7+ Kf8 19.Qh8+ Ke7 20.Qxg7# > +- (#6) Depth: 3/16 00:00:00 > >Frits gives the correct variation in its analysis. Shredder's main line will >have the correct first move, but sometimes the moves after that are silly. >Shredder's main line in this position might look like (just a made up example): > >15. Qh5+ Kg8 16. Qh6 gxh6 17. Re5 Bxe5 18. Bf4 hxg5 19. Kh1 Bxf4 20. Rd1 > +- (#6) Depth: 3/16 00:00:00 > >That line obviously does not lead to mate, and those moves are silly. Shredder >will always play what it thinks is the best move though (not these silly moves >it predicts). Yes, this example captures the idea neatly. Bob D.
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