Do you read better than Lee Changho?

[cyclops]

From recent KGS-plus lecture on yose by breakfast

$$Wc punish w's timesuji
$$ . . . O O X . . . |
$$ . . O . O X . . . |
$$ . . O X X O X X . |
$$ X . O X . O O X . |
$$ . O . X O O O X . |
$$ . . O . O X X O 1 |
$$ . . . . . . . X . |
$$ ------------------+

Click Here To Show Diagram Code

[go]$$Wc punish w's timesuji
$$ . . . O O X . . . |
$$ . . O . O X . . . |
$$ . . O X X O X X . |
$$ X . O X . O O X . |
$$ . O . X O O O X . |
$$ . . O . O X X O 1 |
$$ . . . . . . . X . |
$$ ------------------+[/go]

edit: hint

White, in byomi, needed sente and some time to win the game and he succeeded. Lee Changho failed to punish .
should have been at Q1, a big sente move. In the game B had the chance to pay a small fee and grab sente. The tesuji is some moves later and not quite open in the air.

[Tryss]

This?

$$Wc
$$ . . . O O X . . . |
$$ . . O . O X . . . |
$$ . . O X X O X X . |
$$ X . O X . O O X . |
$$ . O . X O O O X . |
$$ . . O . O X X O 1 |
$$ . . . . . . 2 X . |
$$ ------------------+

Click Here To Show Diagram Code

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

Now if white tenuki, black has a nasty ko with the descent at O2 (white take first, but it's huge), and P1 is not sente for white (black can recapture)


If I'm right : Youhouu \o/

[cyclops]

The question remains why Tryss' move for b results in a better result for him than if w has played correctly. That is why:

$$Wc W's correct play giving him sente
$$ X . O O X . |
$$ X O O O X . |
$$ . O X X O 2 |
$$ . . 1 . X . |
$$ ------------+

Click Here To Show Diagram Code

[go]$$Wc W's correct play giving him sente
$$ X . O O X . |
$$ X O O O X . |
$$ . O X X O 2 |
$$ . . 1 . X . |
$$ ------------+[/go]

as above is better for w than Tryss' punishment of at 2 as in the diagram below:

$$Wc w gets the same sente result, isn't he?
$$ X . O O X . |
$$ X O O O X 4 |
$$ . O X X O 1 |
$$ . 3 . 2 X . |
$$ ------------+

Click Here To Show Diagram Code

[go]$$Wc w gets the same sente result, isn't he?
$$ X . O O X . |
$$ X O O O X 4 |
$$ . O X X O 1 |
$$ . 3 . 2 X . |
$$ ------------+[/go]

?

So who wins the "better than Lee Changho" title?

[HermanHiddema]

Tryss already noted in his post that: "P1 is not sente for white (black can recapture)". Showing he noticed the under the stones in the corner.

[Magicwand]

is not sente because

$$Wc
$$ X . O O X . |
$$ X O O O X 6 |
$$ . O X X O 1 |
$$ . 3 5 2 X 7 |
$$ ------------+

Click Here To Show Diagram Code

[go]$$Wc
$$ X . O O X . |
$$ X O O O X 6 |
$$ . O X X O 1 |
$$ . 3 5 2 X 7 |
$$ ------------+[/go]

$$Wc
$$ X . O O X . |
$$ X O O O X X |
$$ . O . 8 O O |
$$ . O O . . O |
$$ ------------+

Click Here To Show Diagram Code

[go]$$Wc
$$ X . O O X . |
$$ X O O O X X |
$$ . O . 8 O O |
$$ . O O . . O |
$$ ------------+[/go]

[cyclops]

OK, problem solved, thx HH and MW, the title goes to Triss!!
edit: In the real game Lee Changho as B didn't tenuki as in MW's diagram. So W kept sente to play the winning endgame move elsewhere.