In problem 4300 I though that the triangled stone let White live unconditionaly.
Three months after, I realized it was wrong...
Some feedback on the comment :
I agree that in general seki would be the best play in this position. But the point of these problems (4300, 4304 and 4598) is to not let black a chance to get a ko, because depending on the global situation it can be disastrous.
In the actual game the F16 black group was part of a 60 stones dragon with one eye and plenty of possible ko threat to make it lives.