Korean wonderkid Shin Jinseo 3p gave us this rather nice little problem from the 2nd game of the final of the 2nd Let's Run Park Cup. Black ignored white 1, what is white's awesome follow-up?
$$W Black ignored 1, white to play
$$ | . O O O . . . . .
$$ | . X X O . . . . .
$$ | . . . . . . . X .
$$ | . . . X . X . . .
$$ | . . . . . . . . .
$$ | . . X O . O . X X
$$ | . . X . O X O O O
$$ | . . . 1 . . . . .
$$ | . . . . . . . . .
$$ +------------------
[go]$$W Black ignored 1, white to play
$$ | . O O O . . . . .
$$ | . X X O . . . . .
$$ | . . . . . . . X .
$$ | . . . X . X . . .
$$ | . . . . . . . . .
$$ | . . X O . O . X X
$$ | . . X . O X O O O
$$ | . . . 1 . . . . .
$$ | . . . . . . . . .
$$ +------------------[/go]
Answer:
$$Wm2 black resigned after 6, but here is one continuation if black persists
$$ | . O O O . . . . .
$$ | . X X O . . . . .
$$ | . . 2 . . . . X .
$$ | . 1 . X . X . . .
$$ | . . 5 6 . . . . .
$$ | . 7 X O 9 O . X X
$$ | . . X 8 O X O O O
$$ | . 3 4 O 0 . . . .
$$ | . . . . . . . . .
$$ +------------------
[go]$$Wm2 black resigned after 6, but here is one continuation if black persists
$$ | . O O O . . . . .
$$ | . X X O . . . . .
$$ | . . 2 . . . . X .
$$ | . 1 . X . X . . .
$$ | . . 5 6 . . . . .
$$ | . 7 X O 9 O . X X
$$ | . . X 8 O X O O O
$$ | . 3 4 O 0 . . . .
$$ | . . . . . . . . .
$$ +------------------[/go]
$$Wm12
$$ | . O O O . . . . .
$$ | . X X O . . . . .
$$ | . . X . . . . X .
$$ | . O . X . X . . .
$$ | . . O X . . . . .
$$ | . O X O O O 7 X X
$$ | . 5 X X O X O O O
$$ | . O X 6 X 4 . . .
$$ | . 3 1 2 . . . . .
$$ +------------------
[go]$$Wm12
$$ | . O O O . . . . .
$$ | . X X O . . . . .
$$ | . . X . . . . X .
$$ | . O . X . X . . .
$$ | . . O X . . . . .
$$ | . O X O O O 7 X X
$$ | . 5 X X O X O O O
$$ | . O X 6 X 4 . . .
$$ | . 3 1 2 . . . . .
$$ +------------------[/go]
Re: Nice little problem courtesy of Shin Jinseo 3p
Posted: Mon Dec 21, 2015 1:24 pm
by Jhyn
Very good problem. I had a hard time understanding the order of playing 2 and 4 (why not starting with 4 for example), but I think I get it now.