This page contains discussions on errors in problems in Yang Yilun's Ingenious life and death puzzles.
At first there is a large discussion on problem 15 in Volume 1. Dieter Verhofstadt thought it contained an error, but Leon Matoh? gently pointed out his mistake.
On page 31, solution diagram 15 mentions:
This sequence makes miai of a and b.
Leon Matoh 5d points out:
If Black prevents White from making a second eye at , then makes miai of a and b, capturing some stones and living.
Thomas Kahle from Leipzig has found another error in Mr. Yilun's puzzles: check out http://leipzig-go.de/sgf/zwei.sgf for his Number Games No. 2.
(added by Andre Ay)