Table size

The Gomoku board could be 15*15, but the dimensions (pixels) should remain the same so that the buttons are larger. Renjus is 15*15, but the buttons are the same size and the board dimensions are smaller, leaving unused space in the middle of the screen. This would make it easier to keep track of the score and reduce the chance of clicking in the wrong place.

I think 19x19 is normal enough for me :)

19x19 is in gomoku. In Renju, 15x15 is always. I agree with Ain.