Freestyle · Opening
The first move.
GomokuNow does not label any first move as engine-proven best. On this 15×15 board, H8 is the unique symmetric center and leaves equal board room in opposite directions.
H8: the unique symmetric center of a 15×15 board.
What this page can and cannot prove
What is provable is geometry: H8 is the only square whose mirrored point is the board itself in every axis, so it leaves equal board room in opposite directions. What is not provable here is which first move wins or is “best” — this page does not claim one. Every empty intersection is legal on the first move.