BQM 598 (version 1)

on a 13x13 board  

On a 13x13 board, White just played . ​ Assuming is safe, can Black live in the upper-right?

White has 2 supporting stones to close to this diagram's upper-left, and one of them is a 4-4 stone in the upper-left corner, so Black attacking White's stones at the top of this diagram can only help to the extent that it helps Black make Black's own life in the upper-right.

on a 13x13 board  

(In the game, we played this sequence..)