Source: Beseitigung mineralischer Ver-schmutzungen
Why does the correct FM have a lower matching rate?
Ver-schmutzungen and Verschmutzungen are not the same words. If you wish to ignore the difference in this case, please add "-" in the "Do not match" field in Preferences > Memory tab.
Yes, I noticed the dash. But even then: the match with 'organischer' has way less characters in common as the one with 'mineralischer', doesn't it?
For speed reasons, CafeTran performs the whole words comparison. If two words are not the same in the sentence, the whole word's length is taken away. The character based comparison is implemented for CJK languages as there are no word boundaries there.