board.rb

class Board

	def initialize(grid = nil)
		@grid = grid || Array.new(3, Array.new(3))
	end

	def grid
		@grid.each { |row| p row }
	end

	def [](row, col)
		@grid[row][col]
	end

	def []=(row, col, mark)
		@grid[row][col] = mark
	end

	def place_mark(pos, mark)
		# raise Exception if empty?(*pos)
		self[*pos] = mark
	end

	def empty?(pos)
		self[*pos].nil?
	end

	def winner
		
	end

	def over?
		
	end
end