🚀 go-pugleaf

I downloaded gnuchs40.exe from valkyries-2.andrew.cmu.edu, and have some
questions.

1)  When I run gnuchess (on my 386DX-20 PC clone), on startup it says:
    "segmentation violation in pointer 0x00000000 at 18:154a.  Book used
    3985 of 10000 entries.  transposition table is 8192.  playing without
    hashfile."  Then it seems to run normally.  Why the segmentation
    violation?

2)  Where do I get documentation?  (I don't want source code, but would
    like something that tells what the commands do and what the various
    other programs do.)

3)  Today I found myself with a king against its king and rook, playing
    at level 2.  (No, I'm not very good.)  If I remember, king and rook
    should be able to mate in this situation.  The program didn't seem
    to know how to do this, however, moving the rook about aimlessly for
    quite a while.  Finally it did manage to corner my king.  But what
    really did surprise me was: at one point it was the computer's move
    and it had mate in one, but didn't do it!  (The exact situation came
    up two moves later again, and this time it did do it.)  Can someone
    explain why this would happen?  (Did it stop searching when it found
    mate in 3, thereby missing mate in 1?)

Thanks.

David Hillman
dhist1+@pitt.edu