Iyama also got off to a good start in his Oza title defence against Ichiriki Ryo, winning the first game by resignation. I'm not really sure who was winning before, but black 137 seemed like a major blunder from Ichiriki, did he really expect Iyama to cooperatively block rather than resist? Makes me think 113 was heavy...
Here

was 113, Iyama's light jump of 2 was nice, and makes me question is it really a good exchange for black? How about playing 3 directly, or
a or
b?
$$B Ichiriki Ryo 7p (black) vs Iyama Yuta 9p
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . . . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . . O . . . |
$$ | . . . O O X X . . . O . . O . . . . . |
$$ | . . . . . O X O O X X . X 1 . 2 . . . |
$$ | . . . , . O X O X O . . . . a , . . . |
$$ | . . . . . O X O X X X . . . . . . . . |
$$ | . . . O . O X X O . . . b . . . . . . |
$$ | . . X . O X O O O . O . . . . . . . . |
$$ | . O X O O X . . . . . . . . . . . . . |
$$ | . O X X O X . . . . . . . . . . X . . |
$$ | X X O O X . . . X , . . . . 3 , . . . |
$$ | . O O . X . . . . . . . X . . O . . . |
$$ | . X O O X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$B Ichiriki Ryo 7p (black) vs Iyama Yuta 9p
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . . . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . . O . . . |
$$ | . . . O O X X . . . O . . O . . . . . |
$$ | . . . . . O X O O X X . X 1 . 2 . . . |
$$ | . . . , . O X O X O . . . . a , . . . |
$$ | . . . . . O X O X X X . . . . . . . . |
$$ | . . . O . O X X O . . . b . . . . . . |
$$ | . . X . O X O O O . O . . . . . . . . |
$$ | . O X O O X . . . . . . . . . . . . . |
$$ | . O X X O X . . . . . . . . . . X . . |
$$ | X X O O X . . . X , . . . . 3 , . . . |
$$ | . O O . X . . . . . . . X . . O . . . |
$$ | . X O O X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
There is an obvious shape weakness with the double peep here, but black can connect above and net it for now. However, if white got more stones in the centre this might not be possible later:
$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . . . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . . O . . . |
$$ | . . . O O X X . . . O . . O . . . . . |
$$ | . . . . . O X O O X X 2 X X . O . . . |
$$ | . . . , . O X O X O 3 1 . . . , . . . |
$$ | . . . . . O X O X X X . 4 . . . . . . |
$$ | . . . O . O X X O . . . . . . . . . . |
$$ | . . X . O X O O O . O . . . . . . . . |
$$ | . O X O O X . . . . . . . . . . . . . |
$$ | . O X X O X . . . . . . . . . . X . . |
$$ | X X O O X . . . X , . . . . X , . . . |
$$ | . O O . X . . . . . . . X . . O . . . |
$$ | . X O O X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . . . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . . O . . . |
$$ | . . . O O X X . . . O . . O . . . . . |
$$ | . . . . . O X O O X X 2 X X . O . . . |
$$ | . . . , . O X O X O 3 1 . . . , . . . |
$$ | . . . . . O X O X X X . 4 . . . . . . |
$$ | . . . O . O X X O . . . . . . . . . . |
$$ | . . X . O X O O O . O . . . . . . . . |
$$ | . O X O O X . . . . . . . . . . . . . |
$$ | . O X X O X . . . . . . . . . . X . . |
$$ | X X O O X . . . X , . . . . X , . . . |
$$ | . O O . X . . . . . . . X . . O . . . |
$$ | . X O O X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
So here is the 137 I question. The obvious plan seems to be if white blocks (to ensure connection and safety for the not totally alive white group scraggling out from the top left) then black can get a nice atari and capture the side stone, which is worth quite a few points of territory and also thickens up the group so killing any white shenanigans in the corner should be possible:
$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . 7 8 . 6 . . |
$$ | . X . X X O . . . . . . . . O . . 9 . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O 5 . |
$$ | . . . O X X . O O . O O O . 1 O 3 . . |
$$ | . . . O O X X . . . O . . O 2 4 . . . |
$$ | . . . . . O X O O X X . X X . O . . . |
$$ | . . . , . O X O X O . . . . . , . . . |
$$ | . . . . . O X O X X X . . . . . . . . |
$$ | . . . O . O X X O . . . . O . . . . . |
$$ | . . X . O X O O O X O O O X . . . . . |
$$ | . O X O O X . . . X . X X O O . . . . |
$$ | . O X X O X . . . X . . . . . . X . . |
$$ | X X O O X . . . X , . O X O X , . . . |
$$ | . O O . X . . . . . . O X . O O . . . |
$$ | . X O O X . . . . . . X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . 7 8 . 6 . . |
$$ | . X . X X O . . . . . . . . O . . 9 . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O 5 . |
$$ | . . . O X X . O O . O O O . 1 O 3 . . |
$$ | . . . O O X X . . . O . . O 2 4 . . . |
$$ | . . . . . O X O O X X . X X . O . . . |
$$ | . . . , . O X O X O . . . . . , . . . |
$$ | . . . . . O X O X X X . . . . . . . . |
$$ | . . . O . O X X O . . . . O . . . . . |
$$ | . . X . O X O O O X O O O X . . . . . |
$$ | . O X O O X . . . X . X X O O . . . . |
$$ | . O X X O X . . . X . . . . . . X . . |
$$ | X X O O X . . . X , . O X O X , . . . |
$$ | . O O . X . . . . . . O X . O O . . . |
$$ | . X O O X . . . . . . X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
But of course Iyama will not be so generous, but resists with the peep. If black connects above and goes for the net of before it doesn't work if he wants to answer 6 to keep those 4 stones dead (which he might not at this point, and probably white wouldn't save them yet but come back to block the 137 move and make that white group safe, having created the option to save the 4 stones later; I'm not sure how the fighting would go if black did connect above).
$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . . . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . 1 O . . . |
$$ | . . . O O X X . . . O . . O . . . . . |
$$ | . . . . . O X O O X X 3 X X . O . . . |
$$ | . . . , . O X O X O 4 2 . . . , . . . |
$$ | . . . . . O X O X X X 8 5 . . . . . . |
$$ | . . . O . O X X O 7 6 . . O . . . . . |
$$ | . . X . O X O O O X O O O X . . . . . |
$$ | . O X O O X . . . X . X X O O . . . . |
$$ | . O X X O X . . . X . . . . . . X . . |
$$ | X X O O X . . . X , . O X O X , . . . |
$$ | . O O . X . . . . . . O X . O O . . . |
$$ | . X O O X . . . . . . X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . . . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . 1 O . . . |
$$ | . . . O O X X . . . O . . O . . . . . |
$$ | . . . . . O X O O X X 3 X X . O . . . |
$$ | . . . , . O X O X O 4 2 . . . , . . . |
$$ | . . . . . O X O X X X 8 5 . . . . . . |
$$ | . . . O . O X X O 7 6 . . O . . . . . |
$$ | . . X . O X O O O X O O O X . . . . . |
$$ | . O X O O X . . . X . X X O O . . . . |
$$ | . O X X O X . . . X . . . . . . X . . |
$$ | X X O O X . . . X , . O X O X , . . . |
$$ | . O O . X . . . . . . O X . O O . . . |
$$ | . X O O X . . . . . . X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]
In the game Ichiriki played from below, but that allowed white to create, in sente, the option to capture the marked 2 stones for 1 eye (and there's another eye on the top side) so white doesn't need to connect at
a, could connect at 6, which is big for territory and also creates a vital point in the corner at
b (Ichirki resigned when he failed to kill this). So

looks like a big failure to me.
$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . b . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . 1 O 6 . . |
$$ | . . . O O X X . . . O . . O a . . . . |
$$ | . . . . . O X O O # # 4 X X . O . . . |
$$ | . . . , . O X O X O . 2 . . . , . . . |
$$ | . . . . . O X O X X X 3 5 . . . . . . |
$$ | . . . O . O X X O . . . . O . . . . . |
$$ | . . X . O X O O O X O O O X . . . . . |
$$ | . O X O O X . . . X . X X O O . . . . |
$$ | . O X X O X . . . X . . . . . . X . . |
$$ | X X O O X . . . X , . O X O X , . . . |
$$ | . O O . X . . . . . . O X . O O . . . |
$$ | . X O O X . . . . . . X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+
- Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . O . . . . . . . . . . . . |
$$ | . X . X X O . . . . . . . . O . . b . |
$$ | . O X X O O . X X , . X . X . , X . . |
$$ | O . O X O X O O X . . O X . . X . . . |
$$ | . O O X X . . O X X . X . . . X O . . |
$$ | . . . O X X . O O . O O O . 1 O 6 . . |
$$ | . . . O O X X . . . O . . O a . . . . |
$$ | . . . . . O X O O # # 4 X X . O . . . |
$$ | . . . , . O X O X O . 2 . . . , . . . |
$$ | . . . . . O X O X X X 3 5 . . . . . . |
$$ | . . . O . O X X O . . . . O . . . . . |
$$ | . . X . O X O O O X O O O X . . . . . |
$$ | . O X O O X . . . X . X X O O . . . . |
$$ | . O X X O X . . . X . . . . . . X . . |
$$ | X X O O X . . . X , . O X O X , . . . |
$$ | . O O . X . . . . . . O X . O O . . . |
$$ | . X O O X . . . . . . X X . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]