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[go]$$W Mistake 2
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$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . O . O b . . . . . . . O O . . |
$$ | . . O O X . . X . . a X . O O X O . . |
$$ | . . O X X . X . . O . . X X . X O . . |
$$ | . . . . . . . O . . . . . . . X X . . |
$$ | . . O . . . . . . X . . . . . . . . . |
$$ | . . . . X . . X . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . c . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . O . . . . . . . . . . . . X O . . |
$$ | . O X O . . . . . , . . . O O O . O . |
$$ | . . X X X . . . . . . . X . X X O . O |
$$ | . . . . . . . . . . . . . . X . X O . |
$$ | . . . . . . . . . . . . . . . X . . . |
$$ ---------------------------------------[/go]

Should White try to save his stones with ''a'', sacrifice with ''b'' or play elsewhere ''c''?

"a" and "b" are just points, the two white stones are not cutting two weak groups. On the other hand, the extension "c" defends a weak group. So I am tempted to say that "c"is more urgent, but I don't know how to compare the values of the three moves.