Copyright (c) ? Competitive Games
This game is played on a 4x4 square board. Each player starts with 3 basic stones and one wild stone off board.
Black's turn. He wins by moving b4-c3. The only Green option would be to stop the Black wild stone by moving d2-d3, but by moving there it will give a winning 4 in-a-row to Black.
Thanks to Herb Levy for providing Serauqs' rules information.