How do I submit problems for Tactics Trainer? The FAQ says:

"Most of our problems come from games we have analyzed (as explained above). However, we would love to see your submissions which we will include if they meet our standards! All submissions must be in .pgn file(s) within a .zip file and emailed to:"

I do not know how to submit a .pgn file within a .zip file. Can someone clarify?

Also, what are the standards? I've seen some very poor quality puzzles.

1. Create the .pgn file. (if you don't know how to you can use several tools available on the net or even create it using the notepad. Type or paste the game into a .txt file and change the extension later into .pgn

2. To create .zip file, there are also several tools available (computers today brings already several installed, but the most common are winzip and winrar which allows both extensions *.zip and *.rar) Besides, there are free versions of both) To create the .zip file is easy once you have the program installed in your computer and allows to put several .pgn files into the same .zip file (an easy way is to click on the file right button and then select "add this file into xxx.zip" or something similar).

3. Sent it attached to an email to tacticsub@chess.com and that's all.

You can find some of these tools here:

http://winzip.com/downwz.htm

http://www.winrar.es/

(there are older versions available for free out there.. simply use google :)

 *.zip file is a compressed file which allows to put several files into a single file (with the advantages of using less disk space and easier to attach it to emails...etc) 

Awesome. Thanks, Kokino. :)