SUPPORT: CLASSIC CHESS
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Note: Classic Chess is an older program and is not the same as Brain Games Chess. This question is
relevant only to Classic Chess.
Q: I have Classic Chess and I have a broadband connection. I want to play an online game against a
friend who also has this game. Either one of us can chose a game but cannot join the game. The
program waits for a player. My friend is online and hosting, but I can’t join. We are using the TCP/IP
connection and we don’t use the serial set up as it won’t work on our system. How do we get online play to
work?
A: It is possible you and/or your friend are using the incorrect IP address when attempting to connect.
You need to know your public IP address. Private IP address start with 10, 169, or 192. These addresses
are only to be used in private networks and will not travel through the Internet. The easiest way to find your
Public IP address is by visiting a site like www.whatismyip.com. Getting your public IP address is only part
of the solution.
The next step is to configure your router to have the traffic coming into your network to route to the PC
playing chess. This simply means that you are going to convert the traffic coming to your PUBLIC IP
address into a PRIVATE IP address on your network. This configuration varies from router to router.
But first you must access the configuration screen of your router. Check with its documentation or with the
vendor to find out how this is done. Then you generally you want to look for either a Port Forwarding table or
a NAT Table. The chess game uses TCP and UDP ports 47624 and the range from 2300-2400.
Think of Ports as doors in your router. To open the Ports (or doors) you enter the first port number in the first
column, then the ending port number in the second column. You select both TCP and UDP. And finally you
enter the PRIVATE IP of the target PC on your network.
You would need to make two entries for Chess. In the first entry, the first and ending port number will be the
same, 47624. The second entry will have 2300 as the first and 2400 as the ending port number. You cannot
have these ports forwarding to two different PCs on your network. You only have one public IP address,
therefore you can only have one PC that is public.
The last hurdle might be a software firewall. Windows XP SP2 has a built in one. There is also Zone Alarm,
Black ICE, Norton Firewall, etc. These may also block the inbound traffic. You may or may not have to do the
same process in the firewall that you did for the router and open ports 47624 and ports 2300 through 2400.
Classic Chess
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