Copyright (c) 19?? Frank Harary

This game is played on any square board (say 8x8):

  • TURN - On each turn, each player drops a neutral stone on an empty cell provided that it does not share the same row, column or diagonal with all the stones already on board.
  • GOAL - Wins the last player to move.
An example

The green dots show the remaining valid cells. So, the next player will drop one stone there and win the game.

Some possible variants (the first two are Harary's suggestions, the others are mine):

This game title is mine, I don't know the original name but will be glad to hear it if someone does.