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The solver, when it decided that an edge or square should be both TRACK and NOTRACK, would correctly decide that the puzzle was insoluble, but would also mark the edge with both flags in its working copy. This could then lead to assertion violations if that working copy of the board was used for something else, for instance if it was fed back into the solver. This couldn't happen in normal play, since failed solutions just cause the solve command to fail, but the diagnostic "H" command could trigger it from a save file, causing an assertion failure: "state->sflags[y*state->p.w + x] & S_CLUE". Now when the solver runs into this situation, it marks the puzzle as insoluble but doesn't set the invalid flag, so the board remains valid and future solve operations are safe. This save file is the one that demonstrated the problem: SAVEFILE:41:Simon Tatham's Portable Puzzle Collection GAME :12:Train Tracks PARAMS :5:6x6t0 CPARAMS :5:6x6t0 DESC :31:b0t9l,,S0,00,0,0,4,0,0,S0,0,0,0 NSTATES :1:8 STATEPOS:1:2 MOVE :1:H MOVE :1:H MOVE :1:H MOVE :1:H MOVE :1:H MOVE :1:H 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/>.