A few reading points for your practice:
On 60 (

below) what if White cuts as shown here? You are stuck for an answer. You need to continue with 60 at 'a' to extend your liberties.
- Click Here To Show Diagram Code
[go]$$Bc What now?
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . X . . . . . X . . . |
$$ | . . . 1 . . . . . . . . . . . . . . . |
$$ | . . . a . . . . . . . . . . . . . . . |
$$ | . . . X O . . . . . . . . . . . . . . |
$$ | . . 2 X O . . . . . . . O . O . O . . |
$$ | . X X O O . . O O O O . . . . . . . . |
$$ | . O O X X X X X O O O X X O O X O O O |
$$ | . O X . X . X . X O X . . X X . X X X |
$$ | . . X O X O O . X O X X . . . . . . . |
$$ | . . . . O . . . X O O X . . . . . . . |
$$ ---------------------------------------[/go]
On 66 (

below) what if White cuts as shown here? You lose two stones in sente. You should answer

with

to protect you weaknesses. Note that if White then wedges in with 7, you can keep everything by answering with 5.
- Click Here To Show Diagram Code
[go]$$Wc What now (2)?
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . X . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . X . . . . . X . . . |
$$ | . . X X . O . . . . . . . . . . . . . |
$$ | . 8 . 7 . . . . . . . . . . . . . . . |
$$ | . 6 5 X O . . . . . . . . . . . . . . |
$$ | 2 4 3 X O . . . . . . . O . O . O . . |
$$ | 1 X X O O . . O O O O . . . . . . . . |
$$ | . O O X X X X X O O O X X O O X O O O |
$$ | . O X . X . X . X O X . . X X . X X X |
$$ | . . X O X O O . X O X X . . . . . . . |
$$ | . . . . O . . . X O O X . . . . . . . |
$$ ---------------------------------------[/go]
On 146 just extend at

as shown below. The important point is that this threatens to capture five White stones in the ladder at

if White plays against your cut off stones in the corner. If White plays at 3 herself, you can capture the cutting stone with 'a' and the whole upper right corner and side is yours.
- Click Here To Show Diagram Code
[go]$$Bc Just extend with a threat
$$ ---------------------------------------
$$ | X X X . . . . . . . . . . . . . . . . |
$$ | X O X . X . . . . . . . . . . . . . . |
$$ | O O X . O X . . . . . . X O . . a . . |
$$ | . O . X O X . . . X . . . X X X W 2 . |
$$ | X O X X O . . . . . . . X O O O X X . |
$$ | O O O X O . . . . . . . . X O X O . . |
$$ | O X X X O . . . . X . . . 3 O X O . . |
$$ | . O O X O . . . . . . . . . . 1 . . . |
$$ | . X X O . . . . . . . . X . . . . . . |
$$ | . . X O O . . . . X . . O . . X . . . |
$$ | . . X X . O . . . . . . . . . . . . . |
$$ | X . X O O . . . . O . . . . . . . . . |
$$ | . X . X O . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . O . O . O . . |
$$ | X X X O O . O O O O O . . . . . . . . |
$$ | X O O X X X X X O O O X X O O X O O O |
$$ | O O X . X . X X X O X . . X X . X X X |
$$ | . X X O X O O . X O X X . . . . . . . |
$$ | O . . O O . . O X O O X . . . . . . . |
$$ ---------------------------------------[/go]
On 156 you protect against a cut that does not matter. If you had protected the corner with

below, you would still have won big.
- Click Here To Show Diagram Code
[go]$$Bc What now for White?
$$ ---------------------------------------
$$ | X X X . . . . . . . . . . . . . . . . |
$$ | X O X . X . . . . . . . . . . . . . . |
$$ | O O X . O X . . . . . . X O . . 1 . . |
$$ | . O . X O X . . . X . . 3 X X X O . . |
$$ | X O X X O . . . . . . 2 X O O O X X . |
$$ | O O O X O . . . . . . X O . O . O . . |
$$ | O X X X O . . . . X . X O O O . O . . |
$$ | . O O X O . . . . . . . X O . O X . . |
$$ | . X X O . . . . . . . . X . . . X . . |
$$ | . . X O O . . . . X . . O . . X . . . |
$$ | . . X X . O . . . . . . . . . . . . . |
$$ | X . X O O . . . . O . . . . . . . . . |
$$ | . X . X O . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . O . O . O . . |
$$ | X X X O O . O O O O O . . . . . . . . |
$$ | X O O X X X X X O O O X X O O X O O O |
$$ | O O X . X . X X X O X . . X X . X X X |
$$ | . X X O X O O . X O X X . . . . . . . |
$$ | O . . O O . . O X O O X . . . . . . . |
$$ ---------------------------------------[/go]
White 171 (

below)was an incredible opportunity (should have been at 3 below to keep things simple). It leaves behind the atari at

below that captures the White cutting stones.
- Click Here To Show Diagram Code
[go]$$Wc Keep on pushing!
$$ ---------------------------------------
$$ | X X X . . . . . . . . . . . . . . . . |
$$ | X O X . X . . . . . . . . . . 1 2 4 6 |
$$ | O O X . O X . . . . . . X O . X W 3 5 |
$$ | . O . X O X . . . X . X . X X X W X . |
$$ | X O X X O . . . . . . . X O O O X X . |
$$ | O O O X O . . . . . . X O . O . O O X |
$$ | O X X X O . . . . X . X O O O . O X . |
$$ | . O O X O . . . . . . . X O . O X O . |
$$ | . X X O . . . . . . . . X O . . X . . |
$$ | . . X O O . . . . X . X O . . X . . . |
$$ | . . X X . O . . . . . O . . . . . . . |
$$ | X . X O O . . . . O . . . . . O . . . |
$$ | . X . X O . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . . O . O X O . . |
$$ | X X X O O . O O O O O . . . . O . . . |
$$ | X O O X X X X X O O O X X O O X O O O |
$$ | O O X . X . X X X O X . . X X X X X X |
$$ | . X X O X O O . X O X X . . . . . . . |
$$ | O . . O O . . O X O O X . . . . . . . |
$$ ---------------------------------------[/go]
_________________
Dave Sigaty"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21