Strange analysis glitch with F9

I had F9 analyze a game I had just finished on PC (after I annotated it myself first), and there was a strange glitch in the analysis. Look at it's comment/line for whites move 25. It says that white gives away a clear win, but after the line F9 gives black seems to be far ahead, and it's clearly not a win. On top of that while I was annotating After my 24th move F9's top choice was Qf8+ with a supposed draw, however, after I played Rg8 Qh6 it gave black a -+ evaluation. Anyhow, can anybody explain it?



[Event "Rated game, 15m + 0s"]
[Site "Main Playing Hall"]
[Date "2007.01.16"]
[Round "?"]
[White "Sandroalexis"]
[Black "CMSMaster"]
[Result "0-1"]
[ECO "B02"]
[WhiteElo "1119"]
[BlackElo "1262"]
[Annotator "Fritz 9 (2s)"]
[PlyCount "68"]
[EventDate "2007.01.16"]
[EventType "rapid"]

{B02: Alekhine's Defence: Chase Variation and lines with early Nc3} 1. e4 Nf6
2. Nc3 d5 3. e5 Ne4 {last book move} 4. Qh5 Nxc3 5. bxc3 (5. dxc3 g6 6. Qh4 Bf5
$14) 5... e6 (5... g6 6. Qh4 $11) 6. Bd3 Be7 7. Nf3 Nc6 8. Bb5 Bd7 9. Bxc6 (9.
Rb1 b6 $14) 9... Bxc6 $11 10. d4 (10. Qg4 O-O $11) 10... Bb5 {
Traps the king in the center} 11. Rb1 {White threatens to win material: Rb1xb5}
Ba6 12. Ng5 Bxg5 (12... g6 13. Qh6 Bf8 14. Qh3 $15) 13. Bxg5 (13. Qxg5 $5 Qxg5
14. Bxg5 $11) 13... Qd7 $17 14. Rd1 (14. c4 $5 $17) 14... O-O (14... Qa4 15.
Rd2 $19) 15. Qg4 Kh8 16. Bf6 $4 {cause more grief} (16. a3 $142 $17) 16... gxf6
$19 17. exf6 (17. Qf4 {cannot change what is in store for ?} f5 18. Qh6 Rg8 19.
Qf6+ Rg7 $19) 17... Rg8 18. Qh5 (18. Qf3 {doesn't get the bull off the ice}
Rae8 19. g3 e5 $19) 18... Rg6 (18... Rxg2 $142 {seems even better} 19. Rc1 $19)
19. Rd3 (19. g3 $19 {otherwise it's curtains at once}) 19... Bxd3 20. cxd3 Rxf6
(20... Qb5 $142 {and Black wins} 21. O-O Qxd3 22. Rc1 $19) 21. O-O (21. Qe5 {
does not solve anything} Kg7 22. O-O Qd6 $19) 21... Rf5 22. Qh6 Rg8 23. Rb1 Rg6
(23... Qc6 $142 {finishes off the opponent} 24. Qd2 e5 $19) 24. Qf8+ $11 Rg8 {
Black threatens to win material: Rg8xf8} 25. Qb4 $4 {gives away a clear win} (
25. Qh6 Qc6 26. Rc1 $19) 25... b6 26. Qa3 (26. g3 {
cannot undo what has already been done} f6 $19) 26... Rfg5 (26... Rh5 $142 $5 {
might be the shorter path} 27. Qb2 e5 28. g3 $19) 27. g3 f5 (27... Rh5 {
makes it even easier for Black} 28. Qb2 $19) 28. Qc1 (28. Qxa7 Qg7 29. Kh1 Rh5
$19) 28... Qf7 29. Qf4 (29. f4 {is no salvation} R5g6 30. Qe3 Rh6 $19) 29...
Rg4 30. Qe5+ R8g7 31. Qe3 (31. Re1 {doesn't get the cat off the tree} f4 $19)
31... f4 32. Qf3 (32. Qe2 $19 {there is nothing else anyway}) 32... fxg3 33.
Qxf7 gxh2+ 34. Kxh2 Rh4# 0-1


It was a pretty cool game too. 😛

Originally posted by cmsMaster
I had F9 analyze a game I had just finished on PC (after I annotated it myself first), and there was a strange glitch in the analysis. Look at it's comment/line for whites move 25. It says that white gives away a clear win, but after the line F9 gives black seems to be far ahead, and it's clearly not a win. On top of that while I was annotating After my ...[text shortened]... xh2+ 34. Kxh2 Rh4# 0-1


It was a pretty cool game too. 😛

Originally posted by Von Bardeleben
is there an easier way to read all ur gibberish like 1.nd52.Qxc7 blah blah blah. post a board might help

Originally posted by cmsMaster
You have to copy it into something like Fritz/Arena. I'll post the FEN of the position I'm talking about though.

Originally posted by cmsMaster
[fen]5Qrk/pppq1p1p/4p3/3p1r2/3P4/2PP4/P4PPP/1R4K1 w - - 0 25[/fen]

F9 says white "gives away a clear win" here, because my opponent played 25.Qb4 in this position. F9 suggests 25.Qh6, but that doesn't seem any better than the played move.

Originally posted by Von Bardeleben
but why are you posting these noobish games on here, are you trying to laugh at them or what?

Originally posted by cmsMaster
It has nothing to do with the game, it has to do with Fritzes analysis. Ok 7ate....Bardeleben?

I'm going to run it through chessmaster 10. But in the meantime, I've used engines to analyze games and sometimes the computer just doesn't make any sense because it doesn't have enough time or something. Did you run it through Fritz twice or just once??

Originally posted by Dies Irae
I'm going to run it through chessmaster 10. But in the meantime, I've used engines to analyze games and sometimes the computer just doesn't make any sense because it doesn't have enough time or something. Did you run it through Fritz twice or just once??

Originally posted by Von Bardeleben
analyze a game of mine

Originally posted by Dies Irae
I'm going to run it through chessmaster 10. But in the meantime, I've used engines to analyze games and sometimes the computer just doesn't make any sense because it doesn't have enough time or something. Did you run it through Fritz twice or just once??

Chessmaster says this about 24... Rg6

Uh-oh! Leads to 24.Qf8+ Rg8 25.Qh6, which does not result in any captures. Much better is Qc6, leading to 24.Qd2 e5 25.g3 f6 26.Re1 Re8 27.dxe5 fxe5, which wins a pawn for a pawn. Black's only meaningful error of the game gave away a won position, but black was later able to manage a mate anyway.

Originally posted by Dies Irae
Chessmaster says this about 24... Rg6

Uh-oh! Leads to 24.Qf8+ Rg8 25.Qh6, which does not result in any captures. Much better is Qc6, leading to 24.Qd2 e5 25.g3 f6 26.Re1 Re8 27.dxe5 fxe5, which wins a pawn for a pawn. Black's only meaningful error of the game gave away a won position, but black was later able to manage a mate anyway.

I think I know whats up. It thinks its a draw because you'll in theory play Rg8 after he plays Qf8 and this will keep repeating for a draw.

Edit:

Move 25 it says:

Look out. Frees Black's rook from the pin. Leads to 25...b6 26.Re1 Qd6 27.Qb2 Qf4 28.g3 Qf3 29.Qc2 Rf6. Much better is Qh6. This was white's key error. White was not able to regain the lost ground and was eventually mated.

I think it was looking for a draw here. CMX says nothing about a won position. That is weird

Originally posted by cmsMaster
Yeah, after O-O Bf6! draws.