I removed the following two errata entries. The reason is that in both cases, the attacker gains more by capturing stones rather than turning the position into seki.

Page 131, problem 514, solution diagram

Problem 514  

Schinkenjoe: The given solution says this

 

But can´t Black get an Seki ?

Page 136, problem 550, solution diagram

Problem 550  

Schinkenjoe: Also here the books solution

Seki  

doesnt have this in mind.