Why C13-A14 loss 28.7?

[jw4j6464uj46]

Game ID is 80277817.

[godeon]

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[Atorrante]

Welcome to OGS and hope you enjoy your stay here,

Here is the link to that particular game.

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It is about move 81-82.

[Uberdude]

You can link to both the game and the particular move:

https://online-go.com/game/80277817/81

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[Uberdude]

Rather than giving you a fish, I will teach you how to fish, aka use the AI review to find out the answer yourself. Look at the suggested variation:

After sente exchange d5 black plays a15 and white plays 4 at f17 rather than falsifying eye at c13 so black ends up playing there and living. This tells you that white saw a weakness around f17 which needed defending and if white tried to kill black would do something using the fact there wasn’t a white stone at f17 to counterattack and live. So look for that.

[jlt]

I think the reason is that with the game sequence, this atari wasn’t sente (capturing wouldn’t make an eye)

Whereas with this sequence it would be sente.