Cho's encyclopedia of life and death

Black to play

To avoid comments by spam bots, I kindly request you to try to solve the go problem displayed here. I hope I managed to find problems that are not too hard even for beginners, and I apologize to all stronger players if the problems are boring for them. If you get the problem wrong, your comment will not be lost, but will be visible only after manual inspection. Sorry for the inconvenience.

Please type the coordinates of black's next move into the box below (e. g. C3). (In a few cases there is more than one correct answer - just pick one.) If JavaScript is enabled, you can instead just click on the board.