amweak

Nirensei  

Don't like it much, as it aims too much for development on east and west sides ... Which isn't easy to achieve on 13x13. However I never really tried it.

Winged  

This is the first fuseki I experimented. Might looks good as it secures a side and two corners, but not a very active formation. You won't have the initiative often if facing a good white player.

Nimokuhazushi  

Still having the idea that if a corner is good for 13x13, let's take it twice, I experimented the Nimokuhazushi (2x 5-3) a lot. If white invades at a or b, black can happily pincer and this becomes a hard game for white. But white at c really cuts black stones and I haven't thought of a good way to handle that yet.

Nikomoku  

Not as good as the half chinese (which comes next) in my opinion, as there is more space between the corners (too much room for white invading at a).

Half chinese  

This, in my opinion is better than Nimokuhazushi or Nikomoku fusekis, because of the balance between corners, 5 spaces instead of 6. This is the formation I am working with at the moment, but it's not as easy as previous ones to set up as white can easily prevent it.

Half high chinese  

Quite close to the previous one, more oriented toward center though.

Ambush  

Another formation I like a lot, call for an invasion but it's hard for white to find a way to settle fast. By tewari it seems that 1 might be better at a, but because opponent's corner is so close I think it works quite well that way for 13x13.

Tried it a bit, so far without much success.

Concervative  

A peaceful developement, haven't tried it yet but looks quite good.

Mukai Komoku  

Haven't really thought about this yet.

Crossed fuseki with tengen  

Tengen is easier to use on 13x13 than on 19x19, so this fuseki looks playable and very fight oriented. I haven't tried it yet, but will soon, looks very tempting!