Click Here To Show Diagram Code

[go]$$c What does white do now?.
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . 1 . 2 . . |
$$ | . . . , . . . . . , . . . . . 5 3 4 . |
$$ | . . . . . . . . . . . . . . . . . 6 . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . 7 . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

Would white simply play Q18?

r18 is much better shape. Then you can aim for n17 and q14.

I remember Dinerstein played it in his famous win against O Rissei 9p.
http://www.go4go.net/go/games/sgfview/3120

Listen to the dude, this is generally an awful exchange:

Click Here To Show Diagram Code

[go]$$W
$$ ------------+
$$ . . . . . . |
$$ . 2 1 . a . |
$$ . X . O . . |
$$ . . X X O . |
$$ . . . . O . |
$$ . . . . . . |
$$ . . . X . . |
$$ . . . . . . |[/go]

It fixes black's top while you'll have to come back to fix the weakness at "a".

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[go]$$B Only one eye locally
$$ ------------+
$$ . . 7 . 4 . |
$$ . X O 2 1 5 |
$$ . X . O 3 8 |
$$ . . X X O 6 |
$$ . . . . O . |
$$ . . . . . . |
$$ . . . X 9 . |
$$ . . . . . . |[/go]

Basically I think you should only ever play q18 if you intend to immediately take gote to play s18 afterwards. That will hopefully make you more reluctant to make that "fake sente" q18 exchange.

Thank you for your suggestions

Or you can get fancy:

Click Here To Show Diagram Code

[go]$$W
$$ --------------+
$$ . . . . . . . |
$$ . 2 1 3 . . . |
$$ . 4 X . O . . |
$$ . . . X X O . |
$$ . . . . . O . |
$$ . . . 5 . . . |
$$ . . . . X . . |
$$ . . . . . . . |[/go]

Click Here To Show Diagram Code

[go]$$W
$$ --------------+
$$ . . . , . . . |
$$ 8 7 1 2 4 . . |
$$ . 6 X 3 O 5 . |
$$ . . 9 X X O . |
$$ . . . . . O . |
$$ . . . . . . . |
$$ . . . . X . . |
$$ . . . . . . . |[/go]

_________________
Tactics yes, Tact no...

So is not exactly the best response?

Indeed, should r18 clamp first.