+For developers the following non-standard commands might be of interest, mainly useful for debugging:
+
+ * #### compiler
+ Give information about the compiler and environment used for building a binary.
+
+ * #### flip
+ Flips the side to move.
+
+ * #### bench ttSize threads limit fenFile limitType evalType
+ Performs a standard benchmark using various options. The signature or standard node
+ count is obtained using all defaults. `bench` is currently `bench 16 1 13 default depth mixed`.
+
+ * #### d
+ Display the current position, with ascii art and fen.
+
+ * #### eval
+ Return the evaluation of the current position.
+