Copyright (c) 1992 Hans van Maanen
Trianon is a game played on a 5x5 board:
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An example
White's turn. In this position, every White drop makes a 3 in-a-row and that implies losing the game. |
The board should not have edges with even size, because a symmetry strategy for the second player exist. There's a website with information about the game (in Dutch).