To Nicholas Kuschinski:
Thanks for your comment.
1)I agree that checkmate seldom happens early.
2)A piece on the Pocket is somewhat grounded, and I do not feel that it is
such good tactics to hog the Pocket. Indeed, when I tried to give Black
first use of the Pocket in exchange for White's opening move, it didn't
seem to help.
However, if you should prove right, I would switch to Cube Pocket
Polypiece Chess, which gives a player the right to re-enter the Pocket
only when his opponent has done so, but with the extra rule that a player
may also enter the Pocket indefinitely once his opponent has no polypiece
left (or perhaps once he has managed to send his King on the last rank,
which is a useful trick to remove whatever bothers the endgame). The
Pocket is certainly necessary to give mate with several combinations.