Rubinsohl applies when opponents bid spades, the only suit higher than our
hearts. Responses 3♠ and above are the same as over 1♥ (1♠).
1♥ (2♠)
X!
OPT, INV+
2NT!
TRF, 5+♣
1♥ (2♥♠)
3♣!
TRF, 5+♦
3♦!
INV+, 3+♥
3♥
COMP, 3+♥
3♠!
S/T, 3+♥ w/o ♠ CTRL
3NT!
COG, 3+♥ w/ ♠ A/K
4♣!
FRAG, 3+♥, 0–1♠
4♦!
STR PRE, 4+♥
4♥
PRE, UNBAL 4+♥
Doubling the cuebid is penalty oriented and lead directing. It promises
strength, denies good distributional raise (balanced 3=♥ at most), and
encourages leading from a side suit.
1♥ (2♥)
X
PEN, INV+
If the only known suit from (2♥) is spades, plain Rubens suffices. X and 2NT
switch roles.