Some different ideas about the sequence starting at move 48.
- Click Here To Show Diagram Code
[go]$$Bcm48
$$ ----------------------------
$$ | . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . X . . . . X W . . . . . .
$$ | . . . X . . . . . X . . . .
$$ | . X X . . . . . . . . . . .
$$ | O O O O O O . O . . . . . .
$$ | . X X X X . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . . . . X X . . . . . . . .
$$ | . X X X O . . . . . . . . .
$$ | . O O O O . . . . . . . . .[/go]
In the game, Black played hane on top at H16, which I think is a good first instinct against an attachment. The other common option one needs to consider is to extend, for example like this:
- Click Here To Show Diagram Code
[go]$$Bcm48
$$ ----------------------------
$$ | . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . X . . . . X W . . . . . .
$$ | . . . X . . 1 2 . X . . . .
$$ | . X X . . . 3 . . . . . . .
$$ | O O O O O O . O . . . . . .
$$ | . X X X X . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . . . . X X . . . . . . . .
$$ | . X X X O . . . . . . . . .
$$ | . O O O O . . . . . . . . .[/go]
It seems like this would be stronger, as White can't really avoid being cut into two eyeless groups.
A few moves, later, we arrive at
- Click Here To Show Diagram Code
[go]$$Bcm48
$$ ----------------------------
$$ | . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . X . . . 5 X W . . . . . .
$$ | . . . X . 3 2 1 . X . . . .
$$ | . X X . . . 4 . . . . . . .
$$ | O O O O O O . O . . . . . .
$$ | . X X X X . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . . . . X X . . . . . . . .
$$ | . X X X O . . . . . . . . .
$$ | . O O O O . . . . . . . . .[/go]
Here, I think it's worth pointing out that the

/

exchange should be omitted, as it doesn't help Black. This is what Charles Matthews calls the
1-2-3 principle. There's also the proverb "an unnecessary move is a bad move".
One move later,
- Click Here To Show Diagram Code
[go]$$Bcm48
$$ ----------------------------
$$ | . . . . . . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . X . . . 5 X W . . . . . .
$$ | . . . X . 3 2 1 6 X . . . .
$$ | . X X . . . 4 . . . . . . .
$$ | O O O O O O . O . . . . . .
$$ | . X X X X . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . . . . X X . . . . . . . .
$$ | . X X X O . . . . . . . . .
$$ | . O O O O . . . . . . . . .[/go]
I think mentioning broken shape in this context is a failure of pattern matching. This shape even occurs in some joseki, and Black often has a tesuji involving a double atari which is worth learning:
- Click Here To Show Diagram Code
[go]$$Bcm1
$$ ----------------------------
$$ | . . . . . . . . . . . . . .
$$ | . . . . . . . 3 . . . . . .
$$ | . X . . . X X O 1 . . . . .
$$ | . . . X . X O X W X . . . .
$$ | . X X . . . O 2 . . . . . .
$$ | O O O O O O . O . . . . . .
$$ | . X X X X . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . . . . X X . . . . . . . .
$$ | . X X X O . . . . . . . . .
$$ | . O O O O . . . . . . . . .[/go]
It seems to me that this would be playable in this game. White can't really afford to start a ko since Black takes first, and winning it would pretty much be sente against the whole eyeless white group:
- Click Here To Show Diagram Code
[go]$$Wcm1 3 elsewhere as a threat
$$ ----------------------------
$$ | . . . . . . . . . . . . . .
$$ | . . . . . . . X 1 . . . . .
$$ | . X . . . X X O X . . . . .
$$ | . . . X . X O 2 W X . . . .
$$ | . X X . . . O O 4 . . . . .
$$ | O O O O O O . O . . . . . .
$$ | . X X X X . . . . . . . . .
$$ | . . . . . . . . . . . . . .
$$ | . . . . X X . . . . . . . .
$$ | . X X X O . . . . . . . . .
$$ | . O O O O . . . . . . . . .[/go]