DietersMistakesIn2021/Solution13
![[Diagram]](../../diagrams/0/640c2cb04d5a938059ac9d4260e1a485.png)
Mistake 13
is best. It secures the corner, develops the left side and reduces Black's center. It renders Black's stone there ineffective.
![[Diagram]](../../diagrams/14/279e07bd8438556aaff220c91c83403e.png)
Mistake 13
would build Black's center and threaten to surround the corner. It is almost sente.
IN comparison, b is single minded in its development and c has an uncertain outcome. The board is large enough to build and compensate Black's right side moyo.