a little console base tictactoe game I wrote in Ruby.

tictactoe.rb

#init variables
endcase = 0
moveNum = 0
$firstmove = 0
$a,$b,$c,$d,$e,$f,$g,$h,$i = "?", "?", "?", "?", "?", "?", "?", "?", "?"
$v = "?"

def reset(a,b,c,d,e,f,g,h,i) 
	system('clear')

	intro = "WELCOME TO TIC TAC TOE!\nMubarak Sadoon\nMay 15, 2014\nHelp: EX: \'1 3\' means row 1 column 3 or top left corner\nType 'exit' to leave game\n\n"
	puts intro
	grid =   "\t\t#{a}|#{b}|#{c}\n\t\t#{d}|#{e}|#{f}\n\t\t#{g}|#{h}|#{i}\n"
	puts grid	
	puts "\n"
end

def checkboard(v, moveNum)
	if ((($v != 'x') || ($v != 'o')) && (moveNum.even?))
	 		$v = 'x'
	elsif ((($v != 'x') || ($v != 'o')) && (moveNum.odd?))
	 		$v = 'o'
 	end
 	return $v
end

def checkend  

	if ([$a,$b,$c].all? {|x| x=='x'} || [$d,$e,$f].all? {|x| x=='x'} || [$g,$h,$i].all? {|x| x=='x'} || [$a,$d,$g].all? {|x| x=='x'} || [$b,$e,$h].all? {|x| x=='x'} || [$c,$f,$i].all? {|x| x=='x'} || [$a,$e,$i].all? {|x| x=='x'} || [$g,$e,$c].all? {|x| x=='x'})
		return 'x wins!'
	elsif ([$a,$b,$c].all? {|x| x=='o'} || [$d,$e,$f].all? {|x| x=='o'} || [$g,$h,$i].all? {|x| x=='o'} || [$a,$d,$g].all? {|x| x=='o'} || [$b,$e,$h].all? {|x| x=='o'} || [$c,$f,$i].all? {|x| x=='o'} || [$a,$e,$i].all? {|x| x=='o'} || [$g,$e,$c].all? {|x| x=='o'})
		return 'o wins!'
	elsif (($a != '?') && ($b != '?') && ($c != '?') && ($d != '?') && ($e != '?') && ($f != '?') && ($g != '?') && ($h != '?') && ($i != '?') && ($firstmove > 1))
		return 'cats game!'
	end
end

begin
	
	reset($a,$b,$c,$d,$e,$f,$g,$h,$i)

	moveNum += 1
	if moveNum.even? 
		puts   "X's move: "
	else 
		puts   "O's move: "
	end 
	
	$v = gets.chomp 

	$firstmove += 1

	 case $v
	 when '1 1'
	 	if ($a == '?')
	 		$a = checkboard($a, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 	
	 when '1 2'
	 	if ($b == '?')
	 		$b = checkboard($b, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 when '1 3'
	 	if ($c == '?')
	 		$c = checkboard($c, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 when '2 1'
	 	if ($d == '?')
	 		$d = checkboard($d, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 when '2 2'
	 	if ($e == '?')
	 		$e = checkboard($e, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 when '2 3'
	 	if ($f == '?')
	 		$f = checkboard($f, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 when '3 1'
	 	if ($g == '?')
	 		$g = checkboard($g, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 when '3 2'
	 	if ($h == '?')
	 		$h = checkboard($h, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 when '3 3'
	 	if ($i == '?')
	 		$i = checkboard($i, moveNum)
	 	else
	 		moveNum -= 1;
	 	end
	 else 
	 	#do nothing
	 	moveNum -= 1
	 end
	
	 if (checkend === 'x wins!')
		$v = 'exit'
	elsif (checkend === 'o wins!')
		$v = 'exit'
	elsif (checkend === 'cats game!')
		$v = 'exit'
	else
		reset($a,$b,$c,$d,$e,$f,$g,$h,$i)
	end

	if ($v === 'exit') 
		endcase = 1
		puts checkend
	end

end while (endcase === 0)