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In the game renju, the starting player lays the first three stones (black, white, and black) on the intersections on the board, divided by 15 horizontal and 15 vertical lines, so that 225 intersections arise, observing the following rule:
the first stone (black) must be in the centre of the board
the second stone (white) must touch it (one field away from the first in any direction)
the third stone (black) is placed anywhere - however at most 3 fields away from the centre of the board
How many such openings exist?
the first stone (black) must be in the centre of the board
the second stone (white) must touch it (one field away from the first in any direction)
the third stone (black) is placed anywhere - however at most 3 fields away from the centre of the board
How many such openings exist?
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