Competing over (2♦♥♠)

Pass and double keep their meanings from the lower overcalls. Responder still passes with middling values or a trap and doubles with nothing.

Rubinsohl replaces everything but the pass and the double. A transfer shows the suit at once and leaves its strength for later, so one bid replaces both the invitational new suit and the slam-try jump. The strong hand also declares.

Suits still available at the 2-level stay natural and non-forcing, which makes transfers to them forcing to game. Opener completes an invitational+ transfer only with a hand that would pass the invitation.

Against (2♠), swap 3♥ and 3♠ as in Larry Cohen so that opener declares hearts.

Over transfer overcalls

Rubinsohl reads the suit they show, not the bid they make. Every bid from 2NT through 3♥ transfers to the next suit, and 3♠ transfers to 3NT or 4♣. The transfer into their suit is Stayman. A transfer to a suit we could bid at the 2-level is forcing to game, and any other is invitational or better.

A transfer overcall therefore takes the table of the suit it shows. (2♦) showing hearts follows the (2♥) table, and (2♥) showing spades follows the (2♠) table, swap included. The only new bid is their suit at the 2-level. As over the lower transfer overcalls, it is the cheapest cuebid, a game force without a stopper.