ref: 99f8178aabe1f19b0a6ada42e20d58edc8f2ea5b
parent: d558bb240a07bae9799edcf0583b8fa2a0496d53
author: Simon Tatham <anakin@pobox.com>
date: Wed Aug 24 13:32:39 EDT 2005
Brand new difficulty level in Solo. The other day Gareth and I independently discovered an advanced reasoning technique in Map, and then it occurred to me that since Solo can also be considered as a graph-colouring game the same technique ought to be applicable. And it is; so here's a new difficulty level, `Extreme', which sits just above Advanced. Grids graded `Extreme' by new-Solo will of course fall into old-Solo's `Unreasonable' category (since they're not soluble using the old set of non-recursive methods). A brief and unscientific experiment suggests that about one in six Unreasonable grids generated by old-Solo are classified Extreme by the new solver; so the remaining Unreasonable mode (now containing a subset of the grids it used to) hasn't actually become much harder. [originally from svn r6209]