Author: Kelly Fergason
Date: 20:07:53 03/14/04
Go up one level in this thread
On March 14, 2004 at 16:42:20, Bob Durrett wrote: >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. Was this supposed to be a Shredder 8 specific bug? Using your example, 7.04 gives the same answer as your Fritz 8. Also, using Shredder 8 and Fritz 8 in Chessbase 8, I've never actually noticed this bug, and have even specifically looked for it. Would it be position specific, ie. could someone post a position that I could use to demonstrate it for myself? New game r2qr2k/pp1b1pp1/2nbp3/6N1/2pP4/2P5/PP3PPP/R1BQR1K1 w - - 0 1 Analysis by Shredder 7.04: 1.Qh5+ Kg8 2.Qxf7+ Kh8 3.Qh5+ Kg8 4.Qh7+ Kf8 5.Qh8+ Ke7 6.Qxg7# +- (#6) Depth: 10/11 00:00:03 Thanks, Kelly
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