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

["William M. Shubert" <wms@xxxxxxxxxx>]

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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