GNOME Bugzilla – Bug 705383
Review difficulty levels for UCI engines
Last modified: 2013-08-03 22:25:11 UTC
Most UCI engines currently have no support for any difficulty levels. Use the depth argument to UCI "go" to limit search depth, as is done for Stockfish and Glaurung. This basically just entails making sure it works.
This problem has been fixed in the development version. The fix will be available in the next major software release. Thank you for your bug report.