commit - 754e9f069f9a937fe98bb392f425381e5ce04c0b
commit + 183ad6d1284cd6b9d8ed04aea6fb1786eee49ed6
blob - 6354ad0a5fa00d68415813ffd6aaf83c8d11f3e2
blob + ef695bc30ad893235aa3287802261756ccf636af
--- CHANGELOG.md
+++ CHANGELOG.md
@@ -8,6 +8,12 @@ documented in this file.
 - Added usage of `reallocarray()` which handles multiplication
   overflow.
 - Added usage of the functions from `err.h`.
+- Checked out the following files by tag 1.0, because the previous
+  changes made to them possibly introduced game bugs:
+  - `algcheck.c`
+  - `algcheck.h`
+  - `movecheck.c`
+  - `movecheck.h`
 - Cleared sensitive data with `explicit_bzero()`.
 - Fixed an empty hostname in the addplayer program.
 - Fixed bogus type for storing the return value of `time()`. It should