Пока что простой вариант и без логики игры компа.

tictactoe.rb

@hh = {'1' => ' ', '2' => ' ', '3' => ' ', 
	   '4' => ' ', '5' => ' ', '6' => ' ', 
	   '7' => ' ', '8' => ' ', '9' => ' '}

def print_table
	puts ''
	puts "\t\tChoose"
	puts " #{@hh['1']}|#{@hh['2']}|#{@hh['3']}\t\t1|2|3"
	puts " -----\t\t-----"
	puts " #{@hh['4']}|#{@hh['5']}|#{@hh['6']}\t\t4|5|6"
	puts " -----\t\t-----"
	puts " #{@hh['7']}|#{@hh['8']}|#{@hh['9']}\t\t7|8|9"
end

def user_move
		print 'Choose place: '
		@coord = gets.strip
end

def comp_move
	@coord = rand(1..9).to_s
end

def check_win
	if @hh['1'] == @hh['4'] && @hh['4'] == @hh['7'] && @hh['7'] != ' '
		puts "#{@hh['1']} wins!"
		print_table
		puts ''
		exit
	elsif @hh['2'] == @hh['5'] && @hh['5'] == @hh['8'] && @hh['8'] != ' '
		puts "#{@hh['2']} wins!"
		print_table
		puts ''
		exit	
	elsif @hh['3'] == @hh['6'] && @hh['6'] == @hh['9'] && @hh['9'] != ' '
		puts "#{@hh['3']} wins!"
		print_table
		puts ''
		exit
	elsif @hh['1'] == @hh['2'] && @hh['2'] == @hh['3'] && @hh['3'] != ' '
		puts "#{@hh['1']} wins!"
		print_table
		puts ''
		exit
	elsif @hh['4'] == @hh['5'] && @hh['5'] == @hh['6'] && @hh['6'] != ' '
		puts "#{@hh['4']} wins!"
		print_table
		puts ''
		exit
	elsif @hh['7'] == @hh['8'] && @hh['8'] == @hh['9'] && @hh['9'] != ' '
		puts "#{@hh['7']} wins!"
		print_table
		puts ''
		exit
	elsif @hh['1'] == @hh['5'] && @hh['5'] == @hh['9'] && @hh['9'] != ' '
		puts "#{@hh['1']} wins!"
		print_table
		puts ''
		exit
	elsif @hh['3'] == @hh['5'] && @hh['5'] == @hh['7'] && @hh['7'] != ' '
		puts "#{@hh['3']} wins!"
		print_table
		puts ''
		exit
	end	
end

print 'Which symbol U will play? (X/O): '
@user_sym = gets.strip.capitalize	
	if @user_sym == 'X'
		@comp_sym = 'O'
	else
		@comp_sym = 'X'
	end	

loop do

	print_table
	puts "Comp symbol: #{@comp_sym}"
	puts "User symbol: #{@user_sym}"
	while true
		user_move
		puts @hh[@coord]
		if @hh[@coord] == ' '
			@hh[@coord] = @user_sym
			break
		else
			puts 'Wrong coordinates! Try again!'
		end
	end
	check_win
	print_table
	while true
		comp_move
		if @hh[@coord] == ' '
			@hh[@coord] = @comp_sym
			break
		end
	end
	check_win
end