Beginner Exercise 276 / Solution

Eye space  

There are two eye spaces here, the left one promising two eyes.

Eye space  

strikes the vital point, preventing Black from making two eyes there.

Solution  

After securing one eye, destroys the other eye. on a works, too, but leaves an additional ko-threat.

Other  

When Black secures the right eye first, destroys the left eye.

No ko  

There is no chance for forcing a ko, because after , captures two stones.

Bad idea  

After , White killing the left eye first is not a good idea, because creates another potential eye.