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were already making sure that no shuffle move was the precise inverse of the previous one, or contributed to repeating the previous one so many times as to turn it into effectively fewer moves (doing the same rotation three times in Twiddle, or shifting a row by more than half its length in Sixteen). However, they were only checking against the _last_ move, which meant that in any situation where there were completely disjoint move spaces (4x4n2 Twiddle, or any Sixteen at all) it was still possible to have A then B then inv(A) occurring in the shuffle, leading to an unnecessarily easy game. Now both shuffle routines keep separate track of all _non-overlapping_ recent moves, and will avoid inverting any move which hasn't had another move overlap it since it was made. This should reduce the incidence of too-easy limited shuffle games, although it can't be prevented _entirely_ (since, if nothing else, it's always possible to increase the shuffle limit past the maximum group radius). [originally from svn r5875]
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <http://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. You should find several Makefiles in the source code: - `Makefile' should work under GNU make on Linux, provided you have GTK installed to compile and link against. It builds GTK binaries of the puzzle games. - `Makefile.vc' should work under MS Visual C++ on Windows. - `Makefile.cyg' should work under Cygwin / MinGW. With appropriate tweaks and setting of TOOLPATH, it should work for both compiling on Windows and cross-compiling on Unix. - `Makefile.osx' should work under Mac OS X, provided the Xcode tools are installed. It builds a single monolithic OS X application capable of running any of the puzzles, or even more than one of them at a time. Many of these Makefiles build a program called `nullgame' in addition to the actual game binaries. This program doesn't do anything; it's just a template for people to start from when adding a new game to the collection, and it's compiled every time to ensure that it _does_ compile and link successfully (because otherwise it wouldn't be much use as a template). Once it's built, you can run it if you really want to (but it's very boring), and then you should ignore it. DO NOT EDIT THE MAKEFILES DIRECTLY, if you plan to send any changes back to the maintainer. The makefiles are generated automatically by the Perl script `mkfiles.pl' from the file `Recipe'. If you need to change the makefiles as part of a patch, you should change Recipe and/or mkfiles.pl. The manual is provided in Windows Help format for the Windows build; in text format for anyone who needs it; and in HTML for the Mac OS X application and for the web site. It is generated from a Halibut source file (puzzles.but), which is the preferred form for modification. To generate the manual in other formats, rebuild it, or learn about Halibut, visit the Halibut website at <http://www.chiark.greenend.org.uk/~sgtatham/halibut/>.