runner.rb

 #!/usr/local/bin/ruby

def runner( x, y, size, num )
=begin
  if x == size && y == size

    puts "Path found"
  end
  unless x + 1 > size
    runner( x + 1, y, size )
  end
  unless y + 1 > size
    runner( x, y + 1, size )
  end
=end
  if x + 1 <= size && y + 1 <= size
    num + runner( x + 1, y, size, num) + runner( x, y + 1, size, num)
  elsif x + 1 <= size && y + 1 > size
    num + runner( x + 1, y, size, num)
  elsif x + 1 > size && y + 1 <= size
    num + runner( x, y + 1, size, num)
  else
    return 1
  end
  puts num
end

runner( 0 , 0, 2, 0 )