user3872: Someone told me that you can use a chess database for correspondence chess, but this seems a little like cheating. Does anyone has some information on this subject. 

user3844: In accordance with the reference to the ICCF, I think that it's also placed upon you and your correspondent to agree to such things: It's not something that should be kept secret from your opponent.

user3405: According to the official rules of the International Correspondence Chess Federation, you are allowed and encouraged to. It is regarded as learning an opening. Of course, there are different rules for some sites, but most sites follow the ICCF rules.

3872: <p>Someone told me that you can use a chess database for correspondence chess, but this seems a little like cheating. Does anyone has some information on this subject. </p>
 3844: <p>In accordance with the reference to the ICCF, I think that it's also placed upon you and your correspondent to agree to such things: It's not something that should be kept secret from your opponent.</p>
 3405: <p>According to the official rules of the <a href="https://www.iccf.com/message?message=447">International Correspondence Chess Federation</a>, you are allowed and encouraged to. It is regarded as learning an opening. Of course, there are different rules for some sites, but most sites follow the ICCF rules.</p>
