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Re: [computer-go] Slight glitch on "undo" as handled by kgsgtp


then i'll add another one :-) :

- we do not support undo or clear_board. during the game it is impossible for human to undo, he can, however press undo during the scoring phase. at this moment we get a kgs-genmove-cleanup command (which, as has been explained couple of days ago, is sent only in rated games)! that would not be a big problem as we implement the cleanup command, however, after a couple of moves we get an illegal move error just as with the handicap game bug. i have not yet been able to track the reason for it, so it may be a bug in our cleanup implementation,
but the appearence of this thread has made me want to mention it now...

regards
mike

On Sat, 19 Mar 2005, William M. Shubert wrote:

Well, I can always tell when new clients start using kgsGtp because they
find new bugs! There were two found in the past few days:
     * Returning an error to the "final_status_list" command hangs the
       client, found by Lukasz Lew and reported in an earlier email
     * The bug listed below: when you support "clear_board" but not
       "undo", and play as black in a 9x9 handicap game with free
       placement, you don't get the handicap stones sent to you after
       your opponent makes an undo.
Both will be fixed in the 2.6.10 release. Thanks!

On Sat, 2005-03-19 at 20:51 +0000, john@xxxxxxxxxxxxxxxxx wrote:

Just a quick bug report (mainly to wms, but others may have hit this and
wondered what went wrong).
I don't handle "undo" requests in Dumbbot yet.  As I don't advertise this
in "list_commands", the kgsgtp wrapper does it for me every time a human
loser hits undo during a Free game (2 or 3 times a game isn't rare - it's
surprising DB ever gets to win!)  It does this by sending a boardsize
command which clears everything down, resends komi, time_settings etc and
then sends "play" commands to repopulate the board as it was just prior to
the "undo" move.  All very clever and seems to work fine.
However - if the game is a handicap one, the wrapper fails to resend the
"place_free_handicap n" command after the "boardsize" command clears the
game.  This leaves the server out of sync with the engine which eventually
comes up with an illegal move; this illegal move causes kgsgtp to dump the
engine in disgust ;-)
It took me a while to track this one down.  I presumed it was another one
of the many daft mistakes I've made in DB so far.  I've got all the
logfile output if needed, but I'm guessing it was one of those
unthought-of combinations that slipped through and won't take long to fix.
Maybe DB is the only Bot that doesn't honour the "undo" command?

HTH

John


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