This is Iwamoto giving Francis Roads seven stones back in 1975. Black lost a big group at top left but nearly made up for it at the bottom. Here is the final nail in the coffin:

Click Here To Show Diagram Code

[go]$$Bc Position after move 147 (variation): Black to play
$$ +---------------------------------------+
$$ | . . . . O X X . . . O . . . . . . . . |
$$ | O O . O O X O X X X X O . O . O X X . |
$$ | X X O . . X O X O X O . . . . . . . . |
$$ | . . . X X X O O O O O . O X . X X X . |
$$ | X X X X O X X O . . . . . X . . . O . |
$$ | O O O X O X O X X . X . X . . O X X O |
$$ | . X O O O O O . . . . . . O . . . O . |
$$ | . X X . . . . O O O . O . . . O O . . |
$$ | . O X . X X X . X . O X O O . . X X . |
$$ | . O . X X O . . . X X X . X X X . . . |
$$ | . . . . O O O O X . . . . . . . W W . |
$$ | . . O . X O X X . . . . . . . W X X . |
$$ | . . . . O X . . . . . . . . . . W X . |
$$ | . O O O . X . . . . . . . . W . W W X |
$$ | . X X . . . . . . . . X X X W . . X . |
$$ | . . . X . X . . . X . . . O X X X . . |
$$ | . . . . . . . . . . . O . O O . O X . |
$$ | . . . . . . . . . X . . . . . O O O X |
$$ | . . . . . . . . . . . . . . . . . X . |
$$ +---------------------------------------+[/go]

Black to play and do something about the marked white group. (The S1-R2 exchange didn't actually happen in the game; I've added those stones to reduce distractions.)

I guess protect and make ko?

I think it is like this...

That's what happened in the game, and probably what I would have done too. Black wins the ko but loses the game decisively: white has multiple large ko threats to break into the bottom left area.


Yes, that's the best move :-)