timqzm: Why does last atari at F19 is a mistake? While G19 atari is correct
d4rkm4tter: You should always consider the possibility of sacrifice later if the opponent plays tenuki. White gains more after F19 if he gets to play 2 times in a row locally.
Edit: I added it anyways as it locally doesn't make a difference.
Why does last atari at F19 is a mistake? While G19 atari is correct