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The static variable 'solver_recurse_depth' is _mostly_ used by the standalone solver, to appropriately indent the solver diagnostics for the current recursion level. So most uses of it are guarded by an '#ifdef STANDALONE_SOLVER' statement, or some equivalent (such as being inside the solvep() macro). One exception is the check that limits the recursion depth to 5, to avoid getting hung up forever on a too-hard game. Unfortunately, this check depends on the variable actually incrementing when we recurse another level - and it wasn't, because the increment itself was under ifdef! So the generator in live Galaxies could recurse arbitrarily deep, and generate puzzles that the standalone solver found too hard _even_ at Unreasonable mode. Removed the ifdefs, so that solver_recurse_depth is now incremented and decremented. Also, make sure to initialise the depth to 0 at the start of a solver run, just in case it had a bogus value left over from a previous run.
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/>.