If, by chance, a group of your stones is surrounded, try to form a territory with them.
That is, try to make two eyes.
If you still don’t understand the concept of two eyes, click here.
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Here you'll learn the concept of a false eye - it looks like an eye but it's not. In the picture, does the black group have two eyes? There is an eye at F5. D5 appears to be another eye as it is surrounded by 4 black stones. However, it is not an eye as C5 is in Atari and you have to connect it to D5. So you only have one eye - which means death. We call an eye like D5 a false eye. Play freely to explore the possibilities.