I've released version #727, which has a complete manual for CQL (Chess Query Language). You have to switch to the English language if you want to see the manual in your help dialog.
CQL will be the basis for Scidb's searching and filtering functions. For complex position searches the user may write (or use predefined) CQL scripts; for example - knight gives mate with its first move - isolated triple pawns on connected squares - and so on CQL allows nearly unlimited queries. I've wrote the manual before finishing the implementation (about 50% in C++ is already implemented) to have more clearness about extensions of the existing standard (see <http://www.rbnn.com/cql/>). The exisiting standard is designed for studies and problems, but in Scidb CQL will be the basis for all searches, including header searches. For this I invented some more keywords. Furthermore special keywords for other chess variants are required. Proof-reading, suggestions, and comments are very welcome. Gregor