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+# TODO-list for version 2.1 (or is it 3.0 at this point?)
+
+## Rework solver
+
+* Split solve in solve_coord, solve_generic (and maybe solve_singlethread, see
+  notes about build options).
+* Add a void * extradata to DfsArg.
+* remove cube from dfsarg? (i still need to save the scramble somewhere,
+  but I really only use it in dfs_niss)
+* Re-work prepare_step process for solve_generic (nxopt table is special).
+* is_valid should also unnis and / or cleanup the alg.
+
+## New optimal solver (use fst)
+
+* Implement nxopt31 with fst_cube. Remember that the function
+  move_check_solved() should do one axis at the time, so that we don't move
+  everything before checking.
+
+## Simplify steps
+
+* Remove one type of rotation.
+* Change steps to choicestep and stepalt to step (or was this already done?).
+
+## Add missing coordinates and steps
+
+* Check the old file for a list. Many are missing.
+* Checkers in steps.c should use coordinates.
+
+## Missing and new commands
+
+* gen
+* freemem
+* twophase
+
+## Easy improvements
+
+* Solve should re-orient the cube if centers are off
+* Solve: add options for -I (inverse only) and -L (linear = normal + inverse).