[pbmserv-dev] undoing 2+ moves

[Scott Huddleston <scotth@ichips.intel.com>]

The current only way to undo 2+ moves is a full
undo/multi-accept iteration for each move.  Not only
that, but any player can request the undo, not just
the player who's single move will be undone.

Proposal for a more intuitive and streamlined undo:

One player at a time (any player) can request an undo.
The request is that all moves since and after the requesting
player's last move be undone.

Approvals can follow existing protocol -- either all
players must approve the undo, or all players whose move
will be undone must approve (I'm not sure which the
current protocol is).

Also, for timekeeping purposes, when there is an outstanding
undo request the elapsed time should be charged to the player
requesting the undo.

Best,
- Scott


P.S.- If undo isn't streamlined, it should remain possible 
for any player to make single-move undo requests.