DR. ECCO 2023

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This is a two player game for open field tic tac toe.

In the spirit of Gomoku, two people play tic-tac-toe but on a board of user-chosen size。

A player wins by getting four pieces in a row—vertically, horizontally, or diagonally.

Warm-up. Can the first player force a win in seven turns or less, where a turn consists of both player placing pieces?