There are also some interesting bidding consequences of playing rubber. If you have 60 below, then 1NT is enough for game and so the range of a 1NT opener tends to expand to become about 13-20. This can be accommodated without risking missing slam, because now a 2NT response would be a slam-try. Similarly, with 80 below, 1♣-1♠-2♠ shows a really strong hand. And, in order to get the honour bonuses, players will often bid more with solid suits than would otherwise be justified, and bid NT with unbalanced hands with all four aces.