An 8 kyu Problem

[Charlie]

My favourite Android Go problem app. of not-entirely-awful problems presents this as an 8 kyu problem:

$$Bc Black to Play
$$ +-------------
$$ | . O . . . .
$$ | O O . X . .
$$ | . X O X . .
$$ | X . O X . .
$$ | . O X X . .
$$ | . O . . . .
$$ | O X X . . .
$$ | X . . . . .
$$ | . X . . . .
$$ | . . . , . .
$$ | . . . . . .

Click Here To Show Diagram Code

[go]$$Bc Black to Play
$$ +-------------
$$ | . O . . . .
$$ | O O . X . .
$$ | . X O X . .
$$ | X . O X . .
$$ | . O X X . .
$$ | . O . . . .
$$ | O X X . . .
$$ | X . . . . .
$$ | . X . . . .
$$ | . . . , . .
$$ | . . . . . .[/go]

Without much time, I found this solution and couldn't refute it in my head:

$$Bc 7 at 1
$$ +-------------
$$ | . O . . . .
$$ | O O 2 X . .
$$ | 4 X O X . .
$$ | X 1 O X . .
$$ | 5 O X X . .
$$ | 6 O 3 . . .
$$ | O X X . . .
$$ | X . . . . .
$$ | . X . . . .
$$ | . . . , . .
$$ | . . . . . .

Click Here To Show Diagram Code

[go]$$Bc 7 at 1
$$ +-------------
$$ | . O . . . .
$$ | O O 2 X . .
$$ | 4 X O X . .
$$ | X 1 O X . .
$$ | 5 O X X . .
$$ | 6 O 3 . . .
$$ | O X X . . .
$$ | X . . . . .
$$ | . X . . . .
$$ | . . . , . .
$$ | . . . . . .[/go]

Honestly, I didn't look for other solutions after finding this one. I'd have fun playing this way, in a game.

The app. thinks it's wrong. Is there anything wrong with it?

[HermanHiddema]

The app. thinks it's wrong. Is there anything wrong with it?

No, the app probably just expects and in reverse order. It is not uncommon for solutions to miss alternate order variants.

[Bill Spight]

Both lines kill, but your solution is superior.