$$ Do you have a plan to refute this W 2?
$$ | . . . . . . .
$$ | . . X X a . .
$$ | . X O X . . ,
$$ | . 2 . O X X .
$$ | O . O . O X .
$$ | . 1 . . O X .
$$ +--------------
[go]$$ Do you have a plan to refute this W 2?
$$ | . . . . . . .
$$ | . . X X a . .
$$ | . X O X . . ,
$$ | . 2 . O X X .
$$ | O . O . O X .
$$ | . 1 . . O X .
$$ +--------------[/go]
$$ :w6: goes running, but the corner dies
$$ | . 6 . . . . .
$$ | . 4 X X a . .
$$ | 5 X O X . . ,
$$ | . 2 8 O X X .
$$ | O 9 O 7 O X .
$$ | . 1 3 . O X .
$$ +--------------
[go]$$ :w6: goes running, but the corner dies
$$ | . 6 . . . . .
$$ | . 4 X X a . .
$$ | 5 X O X . . ,
$$ | . 2 8 O X X .
$$ | O 9 O 7 O X .
$$ | . 1 3 . O X .
$$ +--------------[/go]
$$ It all dies
$$ | . 7 . . . . .
$$ | 6 4 X X a . .
$$ | 5 X O X . . ,
$$ | 8 2 . O X X .
$$ | O . O 9 O X .
$$ | . 1 3 . O X .
$$ +--------------
[go]$$ It all dies
$$ | . 7 . . . . .
$$ | 6 4 X X a . .
$$ | 5 X O X . . ,
$$ | 8 2 . O X X .
$$ | O . O 9 O X .
$$ | . 1 3 . O X .
$$ +--------------[/go]
$$ It dies here too
$$ | . . . . . . .
$$ | . 5 X X a . .
$$ | . X O X . . ,
$$ | . 2 . O X X .
$$ | O . O 4 O X .
$$ | . 1 3 . O X .
$$ +--------------
[go]$$ It dies here too
$$ | . . . . . . .
$$ | . 5 X X a . .
$$ | . X O X . . ,
$$ | . 2 . O X X .
$$ | O . O 4 O X .
$$ | . 1 3 . O X .
$$ +--------------[/go]
cyclops wrote:Black to move: Find the first 5 moves of the main-variant that kills W unconditionally or in double ko. If there are more solutions find the most profitable or most simple one. I publish the ( book ) solutions after 10 days. Difficulty: sdk
I'm interested in how you estimate the difficulty of each problem. So I look forward to reactions like:
b > a = d > c ( c is easiest ) or
b = 500 s, a = d = 100 s, d = 40 s. ( for this 7 kyu, s for seconds ) or
b = 4 k, a = d = 6k, d = 8k.
(...)
1s 5s 2s 10s
d < c < b < a
(whereas in a, I wanted to start with a2, but now, with hindsight, b3 is much cleaner)
together we find a and c the hardest, and d the easiest.
Why did I test you like this? Because I'm doing this book for the third time now. And everytime I get stuck at a. I focus at b1 as initial move and than it is too difficult to solve by head. For the other ones I developed a feeling from previous times. Even not blessed with unkx80's memory capacibilities.
So why no feeling for problem a. Because of the false solution, may be.
Why false? Because it gives white a sente move along the edge.
$$Bc 2@a,7@b: ko
$$ | . . . . . . .
$$ | . 3 . . . . .
$$ | 5 a X X . . .
$$ | . X . X . . .
$$ | . 4 9 O X X .
$$ | O . O b O X .
$$ | . 1 6 8 O X .
$$ +---------------
[go]$$Bc 2@a,7@b: ko
$$ | . . . . . . .
$$ | . 3 . . . . .
$$ | 5 a X X . . .
$$ | . X . X . . .
$$ | . 4 9 O X X .
$$ | O . O b O X .
$$ | . 1 6 8 O X .
$$ +---------------[/go]
above is not attractive for B so he plays
$$Bc w gets 2 in for free
$$ | . . . . . . .
$$ | . 2 X X . . .
$$ | . X O X . . .
$$ | . 3 . O X X .
$$ | O . O . O X .
$$ | . 1 . . O X .
$$ +---------------
[go]$$Bc w gets 2 in for free
$$ | . . . . . . .
$$ | . 2 X X . . .
$$ | . X O X . . .
$$ | . 3 . O X X .
$$ | O . O . O X .
$$ | . 1 . . O X .
$$ +---------------[/go]
Lesson learnt: stick to Kageyama's fundamentals: first try is to reduce eyespace. Helps also in problem c.
