Author: Steve Coladonato
Date: 09:06:43 02/05/00
I have included the PGN for a Marshall game with the Sapphire II. The game
includes analysis from Fritz 5.32 and my comments on some of moves and
evaluations. The Sapphire continues to play this line up through move 16 where
it starts to deviate. It's learning mode is trying to help it but I think it
isn't deviating early enough.
In the original post, I stated that both the Sapphire and Fritz had fallen
victim to the Marshall. However, when I took a look at the Fritz game, I wasn't
sure what level it was playing at; it may have been sparring. So rather than
open a can of worms, I have not included it. The Sapphire II game is pretty
much repeatable so I have included it.
Blass, I don't know if this is exactly what you were looking for but here it is.
[Event "Casual"]
[Site "Home"]
[Date "1999.10.23"]
[Round "?"]
[White "Sapphire II"]
[Black "Coladonato, Steve"]
[Result "0-1"]
[ECO "C89"]
[PlyCount "64"]
[EventDate "1999.??.??"]
1. e4 {the analysis for this game was done by Fritz with a threshold of 38.
The time control was G/60.} 1... e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7
6. Re1 b5 7. Bb3 O-O 8. c3 d5 9. exd5 Nxd5 10. Nxe5 Nxe5 11. Rxe5 c6 12. d4 Bd6
13. Re2 {
I'm not sure why the Sapphire II plays this move. 13. Re1 seems to be better.}
13... Qh4 14. g3 Qh5 15. Bxd5 {last book move. I believe this is where the
Sapphire II goes wrong. This move creates a true pin on the e2 Rook and
doesn't relieve any of the pressure on the King side. Shredder likes Re4 with
the same threshold.} 15... cxd5 16. Qe1 Bg4 17. Re3 f5 18. f3 18... f4 $16 {
0.94 Fritz 5.32: I don't understand this evaluation by Fritz. the continuation
it recommends is 19.fxg4 Qxg4 20. Qe2 Qg6 21.Re6 at depth 10. Yet when it
evaluates 20...Qg6 it picks Rf3 at depth 7 and hangs onto it.} (18... Bh3 19.
Qe2 Rae8 20. Qf2 f4 21. gxf4 Be6 22. Re1 Bxf4 23. Bxf4 $14 {0.44/11}) 19. fxg4
Qxg4 20. Qe2 Qg6 21. Rf3 21... fxg3 $14 {0.50 Fritz 5.32:} (21... Rae8 22. Qd1
fxg3 23. h4 Rxf3 24. Qxf3 $11 {0.00/10}) 22. hxg3 $11 {-0.09 Fritz 5.32:} (22.
h3 Rxf3 23. Qxf3 Qe6 24. Bd2 Rf8 25. Qg4 Qf7 26. Qe2 26... Qf2+ $14 {0.50/11})
22... Rae8 $16 {0.75 Fritz 5.32:} (22... Bxg3 23. Nd2 Rae8 24. Rxf8+ Rxf8 25.
Qg2 Bf2+ 26. Kh2 Qh6+ 27. Qh3 $11 {-0.09/11}) 23. Rxf8+ 23... Rxf8 $11 {
-0.03 Fritz 5.32:} (23... Bxf8 24. Qf2 Bd6 25. Bd2 Bxg3 26. Qg2 Bf2+ 27. Kh2
Qh5+ 28. Qh3 $14 {0.41/11}) 24. g4 Bg3 25. Nd2 Rf2 26. Qe7 $17 {-0.75 Fritz 5.
32: 26. Qe7 is evaluated +2.06 for white up through depth 7 at which point it
goes way down in Black's favor. This may by a limitation of the Sapphire II
at G/60 and it never realizes that Black will have the advantage.} (26. Qxf2
Bxf2+ 27. Kxf2 Qxg4 28. Nf3 Qf5 29. b3 Qc2+ 30. Bd2 30... h6 $14 {0.28/12})
26... Qxg4 27. Qd8+ Rf8 28. Qxd5+ Kh8 29. Qg2 $2 $19 {-7.72 Fritz 5.32: Qg2
does not show up as really bad for White until depth 10 in the Fritz
evaluation. Again, I think we are encountering a boundary for the Sapphire II
in that it probably doesn't get to that depth in it's evaluation.} (29. Nf3
Bd6+ 30. Kf2 Qg3+ 31. Ke2 Qg2+ 32. Kd1 Rxf3 33. Qa8+ 33... Bf8 $19 {-5.09/10})
29... Bf2+ 30. Kh1 Qh5+ 31. Qh2 Qd1+ 32. Kg2 Qg4+ 0-1
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