🚀 go-pugleaf

I booted up linux on my home PC last night and tried building gnuchess pl71
for it to see what would happen.

I get similar problems to what others have reported: gnuchess exits in the
middle of the game.  I have a position where gnuchessr will reproducibly exit
during search ply 7.  (I didn't bring it with me, but it was easy to find; it
came in the first game I played.)

Interesting points: (1) The problem is easily reproducible.  (2) When the
program exits on me, it prints the message "Time Control Error" first.  This
message is completely bogus.  It is printed only by some code in main() that
parses command-line arguments!  Therefore I'm guessing the problem is that an
array on the stack is overflowing and trashing the return address to a
function call, causing a jump to a garbage address.  In the case I have, the
address happens to be in the middle of main().  (3) As another poster
reported, the bug seems to go away when -DKILLT is removed from the Makefile
OPTS string.  This doesn't necessarily mean the bug is in the KILLT code,
unfortunately, but that would be a good place to start looking.

I will try to find time to look at this further later on, or perhaps Mike or
Kong Sian will be able to find it with these hints.

On another topic mentioned in this thread: The bug where gnuchess plays on
despite being checkmated or stalemated was not fixed in pl71.  The patch for
it was left out by mistake.  It ought to be fixed in pl72.  You might be able
to find the patch in a recent version of the gnu.chess FAQ posting (but not
the latest one).

	--Tim