I don't understand. Who played 59. .. Bc2+? Your opponent? Are you blaming your program for it?
This 56. Rxb3 you played seems dubious, the proposed 56. h5 forces a win, while this led to a drawn endgame... in which your opponent missed his chance to draw.
The comment to Black's move 59 is by Fritz. Fritz says Black throws away the win here--then gives Kf7 as equal (!!). That's what I mean--is my Fritz corrupt? Is this common to Fritz programs?
Should've got the toaster
OK show us the win for white after 59. ... Kf7
Pushing the g-pawn doesn't look convincing? g6+, g7, g8--how does Black stop this?
Btw it's normal for Fritz programs to shatter your dreams of Chess Mastery
In normal notation please
59. ... Kf7
60. g6+ Kf6
61. g7 Kg5
now what
Now you've got Fritz 12 but nothing to prepare your waffles
Tell me this--where is the win Black missed (according to Fritz) on move 59?
That's the draw, but where's the win?
The only hole I can imagine is the one in your pocket after you paid for the program. 
That's the draw, but where's the win?
If Black played 59 ... Kf7, there would have been a draw. Otherwise all the scenarios led to the inevitable loss of the bishop and pawn promotion soon afterwards.
Let me clarify--my Fritz says that (with 59....Bc2+) that Black throws away a win here. This is what concerns me--that Fritz says Black can win here. I say no chance. Now, it has been proven that my evaluation of the position--White wins after Rxb3--is wrong. But show me the win for Black on Black's 59th move. Otherwise, Fritz is wrong. And I am concerned--do I have a corrupt version of Fritz-12? That's what this post is all about.
"would save the game" does not imply the game should be a win for black
The most interesting line is 59. ... Kf7 60. g6+ Kf6 61. g7 Kg5 62. h6 Kh5 63. g8=Q Bxg8+ 64. Kg7 Kg5! =
To LaskerFan
On two seperate analytical sessions Fritz commented that Black throws away a win here. I was hoping that someone here with their own copy of Fritz would have their engine analyze to this move to see what it says--if it is common to all machines to misstate the position here, then it's just minor oddity. But if it isn't common then my version may be corrupt. That's all I'm trying to find out. But thanks for the comments and the analysis--that's why I love this site.
But if it isn't common then my version may be corrupt. That's all I'm trying to find out.
Try flushing the hash table/cache of your engine. It's under the Choose an Engine then Parameters.
If you played around with your settings from the default, you should reset them back again.
Third, switch to another engine then back just to force Fritz to refresh itself.
To chessroboto
Thanks for the ideas. I'll give them a shot, then re-analyze the game and see what it says.
To LaskerFan
I'm a little less concerned now--you're right, it's a text error, not a program one. But I'm still curious about it's commonality. Thanks.
Let me clarify--my Fritz says that (with 59....Bc2+) that Black throws away a win here. This is what concerns me--that Fritz says Black can win here. I say no chance. Now, it has been proven that my evaluation of the position--White wins after Rxb3--is wrong. But show me the win for Black on Black's 59th move. Otherwise, Fritz is wrong. And I am concerned--do I have a corrupt version of Fritz-12? That's what this post is all about.
"simply marches past the door to victory" , Fritz team might have to work on repository of comments :-)
Black could have win here only if there is a mate available via zugzwang, and that would make a nice puzzle.
But, since the bishop is of wrong colour, Im not sure if this can be done.
Btw, why don't you use the "blunder check" analysis, it will give you a numerical analysis of the position. You can also use "deep analysis of the position" which would give you best move along with several moves continuation 
I recently purchased Fritz-12 and began having Fritz analyze some old tournament games. In one game it gave me some very curious analysis--either it's dead wrong or I'm missing something obvious. Anyone with a copy of Fritz care to throw this on their machine and tell me if your Fritz says the same as mine? I give the game in it's entirety, with my notes being verbal (except one). If you don't want to play through the game, go to move 59 to see what I mean.