13x13 Board
This is a good board for quick games when you want more strategy than is possible on the 9x9 board. Also, at 47 percent of the points of a standard 19x19 goban, you get a less complicated game.
13x13 board is often used by beginners that have played enough with 9x9 board.
There are 13x13 boards available, usually on the back of a 19x19 full size board, but also such boards exist, where one side has 9x9 board and the other side has 13x13 board.
Most on-line Go servers offer you the option to play 13x13.
ProtoDeuteric- Often I don't know where to start on 13x13 boards. Sometimes I get to a point in play where I have no idea what I'm doing and I feel lost. What are some fusekis, strategies, and tactics good for 13x13 go?
Crimson- I'm only 18k or so, but I'll speak up anyway. I guess that on a 13*13 board, you could generally make the first moves at the corners the same way you would at 19*19. I also think that territory counts more than influence for that matter, but as soon as you have two corners and some of the side don't be afraid to jump to the centre. This might not be best, but just try to open around the corner star-points, then work up your way to the side and centre. After some playing you will see what is good and what you like best.
Bob McGuigan: I think the precedence of corners before sides before center is still valid on the 13x13 board. So, too, is the advice to play urgent points before big points. Aside from this it is still important to find the biggest areas to play. The difference from 19x19 go comes in evaluating the size of plays and urgency of plays.
Gabaux - Teaching several persons to play go I have good experience with this board size. You will not fight so quick as in the 9X9 board, but have a better overview compared to the full size. It is quite important, that the games are definitly shorter, so the beginners will not get bored.
Original author: TimBrent