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Unequal has a flags word per cell. Some of those flags are fixed, like the locations of the ">" signs, but others indicate errors and are used to allow the player to mark clues as "spent". Move strings beginning with "F" allow the user to change the "spent" flags, but they shouldn't allow the user to change any other flags, especially those marking the constraints. Without this fix, the following save file gives a "solver_nminmax: Assertion `x >= 0 && y >= 0 && x < o && y < o' failed" after it adds a clue that points off the board: SAVEFILE:41:Simon Tatham's Portable Puzzle Collection GAME :7:Unequal PARAMS :3:3e0 CPARAMS :3:3e0 DESC :17:0,0,0,0,0,0,0,0,0 NSTATES :2:3 STATEPOS:1:3 MOVE :6:F2,0,4 MOVE :1:H
This is the README accompanying the source code to Simon Tatham's puzzle collection. The collection's web site is at <https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>. The puzzle collection is built using CMake <https://cmake.org/>. To compile in the simplest way (on any of Linux, Windows or Mac), run these commands in the source directory: cmake . cmake --build . 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 <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.