At 131 both of you forgot what were the important stones. In the game you answered at 3 below and Black captured at 2. Instead you should have connected at 2! These are the vital stones that threaten to cut off Black's left-side group.
$$Bc Exciting part #1
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X , X 1 . . . O O X . |
$$ | . . X O . X X O O O X O 3 . . . O O . |
$$ | . . O . O O X O X X O X O . . . . . . |
$$ | . . . X X . O . X O 2 . O . . . . . . |
$$ | . X X . . X X X X 6 X 4 . . O . O . . |
$$ | . O . X X . O O . 8 7 5 X . . . . . . |
$$ | . . O O O O . . . O . O . . X , X . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
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- Click Here To Show Diagram Code
[go]$$Bc Exciting part #1
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$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X , X 1 . . . O O X . |
$$ | . . X O . X X O O O X O 3 . . . O O . |
$$ | . . O . O O X O X X O X O . . . . . . |
$$ | . . . X X . O . X O 2 . O . . . . . . |
$$ | . X X . . X X X X 6 X 4 . . O . O . . |
$$ | . O . X X . O O . 8 7 5 X . . . . . . |
$$ | . . O O O O . . . O . O . . X , X . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------[/go]
Obviously death is not an option so Black has to back up...
White can push into the bottom area due to the thinness of Black's group. The top right is not something to worry about...
$$Bc Continuation
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X , X X 7 . . O O X . |
$$ | . . X O . X X O O O X O . 8 . . O O . |
$$ | . . O . O O X O X X O X O . . . . . . |
$$ | . . . X X . O . X O O 2 O . . . . . . |
$$ | . X X . . X X X X 1 X . . . O . O . . |
$$ | . O . X X . O O . . . 3 X 5 . . . . . |
$$ | . . O O O O . . . O . O 4 . X , X . . |
$$ | . . . . . O . O . . . . . 6 . . . . . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$Bc Continuation
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X , X X 7 . . O O X . |
$$ | . . X O . X X O O O X O . 8 . . O O . |
$$ | . . O . O O X O X X O X O . . . . . . |
$$ | . . . X X . O . X O O 2 O . . . . . . |
$$ | . X X . . X X X X 1 X . . . O . O . . |
$$ | . O . X X . O O . . . 3 X 5 . . . . . |
$$ | . . O O O O . . . O . O 4 . X , X . . |
$$ | . . . . . O . O . . . . . 6 . . . . . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
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At 142 what were you think'n!?
Simply 1 and it's, "Nothing here, move along!"...
$$Wc Facepalm time!
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . . X . |
$$ | . . . X X . O . X O X . O . . 2 X . . |
$$ | . X X . . X X X X . X . . . O . O X . |
$$ | . O . X X . O O . . . . X . 3 . 1 O . |
$$ | . . O O O O . . . O . O . . X , X . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
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[go]$$Wc Facepalm time!
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$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . . X . |
$$ | . . . X X . O . X O X . O . . 2 X . . |
$$ | . X X . . X X X X . X . . . O . O X . |
$$ | . O . X X . O O . . . . X . 3 . 1 O . |
$$ | . . O O O O . . . O . O . . X , X . . |
$$ | . . . . . O . O . . . . . . . . . . . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------[/go]
Even after that, however, there was a big chance...
When Black (mistakenly) answered 1 below at 2, White should have immediately played the atari at 3. If Black connects at 4 as in the game, White 5 captures the Black stones. If Black plays 6 at 7, White 'a' is atari and White wins the fight. In fact Black would have had to play 4 at 7 and fight the ko.
$$Wc Exciting part #2
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$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . . X 5 |
$$ | . . . X X . O . X O X . O . . a X 4 7 |
$$ | . X X . . X X X X . X . . . O O O X 3 |
$$ | . O . X X . O O . . . . X . . . X O . |
$$ | . . O O O O . . . O . O . . X , X 1 . |
$$ | . . . . . O . O . . . . . . . . 2 6 . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
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[go]$$Wc Exciting part #2
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$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . . X 5 |
$$ | . . . X X . O . X O X . O . . a X 4 7 |
$$ | . X X . . X X X X . X . . . O O O X 3 |
$$ | . O . X X . O O . . . . X . . . X O . |
$$ | . . O O O O . . . O . O . . X , X 1 . |
$$ | . . . . . O . O . . . . . . . . 2 6 . |
$$ | . O O X . X X O . . . . . . . . . . . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------[/go]
White's push at 3 below in the game changed the shape significantly and allows Black to capture the 3 stones.
$$Wc No excitement here

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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . . X 7 |
$$ | . . . X X . O . X O X . O . . . X 6 9 |
$$ | . X X . . X X X X . X . . . O O O X 5 |
$$ | . O . X X . O O . . . . X . . . X O 0 |
$$ | . . O O O O . . . O . O . . X , X 1 . |
$$ | . . . . . O . O . . . . . . . . 2 3 8 |
$$ | . O O X . X X O . . . . . . . . . 4 . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$Wc No excitement here 
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . . X 7 |
$$ | . . . X X . O . X O X . O . . . X 6 9 |
$$ | . X X . . X X X X . X . . . O O O X 5 |
$$ | . O . X X . O O . . . . X . . . X O 0 |
$$ | . . O O O O . . . O . O . . X , X 1 . |
$$ | . . . . . O . O . . . . . . . . 2 3 8 |
$$ | . O O X . X X O . . . . . . . . . 4 . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . . . . . . X . X . X . X . . |
$$ | . X X X . . . . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------[/go]
Last but not least.
When Black played 1 and there was that big Whoops(!) moment. It was time look a little closer. White should throw in at 2 and atari at 4. Black can not connect so capturing at 6 is sente. There is no reason to finish capturing here. Black has to fight and win the ko to prevent White capturing the additional stone. After exchanging 8 for 9, I would play 10 and invite Black to kill my center stones if he thinks he can...
$$Bc 6@2
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . 4 X . |
$$ | . . . X X . O . X O X . O . . O X 2 3 |
$$ | . X X . . X X X X . X . . . O O O X . |
$$ | . O . X X . O O . . . . X . . . X O 5 |
$$ | . . O O O O . . . O . O . . X , X O 7 |
$$ | . . . . . O . O . . . . 0 . . . X O 1 |
$$ | . O O X . X X O . . . . . . . . . X . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . 9 . . . . X . X . X . X . . |
$$ | . X X X . . 8 . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------
- Click Here To Show Diagram Code
[go]$$Bc 6@2
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . X . . . X X O X X . . . . |
$$ | . . . . . . . . . X . O O O O X X X . |
$$ | . . O O . O O X X X X X O . . O O X . |
$$ | . . X O O . . O O O X O O . . . O O O |
$$ | . . O . O O . O X X . X O . . . 4 X . |
$$ | . . . X X . O . X O X . O . . O X 2 3 |
$$ | . X X . . X X X X . X . . . O O O X . |
$$ | . O . X X . O O . . . . X . . . X O 5 |
$$ | . . O O O O . . . O . O . . X , X O 7 |
$$ | . . . . . O . O . . . . 0 . . . X O 1 |
$$ | . O O X . X X O . . . . . . . . . X . |
$$ | . X X . . . . X O . O . X . . . . . . |
$$ | . . X . . . . X . . . X . . . . . . . |
$$ | . . . . . 9 . . . . X . X . X . X . . |
$$ | . X X X . . 8 . . , . X O X O O X . . |
$$ | . O O . X X O . . O . X O . O X O O . |
$$ | . . . O O O . . . . O O . O X X X X . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------[/go]