Originally posted by blankoblanco
So... you played everything correctly. Playing these center 2 hexes in the middle are tricky because you have to make sure you are either getting a Closed 2 or you have to the opportunity to balance out your edge or be willing to share the side. Both you and Daniel play the sides remarkably well, especially considering how little I explained to the 2 of you compared to how much I explained to my brother, and both of you guys are still better than my brother.
Also... one more thing... I'm sure you already know this but... when sharing sides of this sort like on the Southern side of this game after Green has played #19, now there is a potential Wedge spot at c4 for BOTH players. Now both players can sacrifice a corner and Wedge so... you just have to be careful of that OR you can use it to your advantage.
Feel free to keep asking questions of this sort.

Here's a link to the game after move #19 for reference.