SEF is rather similar to SAYC, the differences I can think of right now being: - 2♣ opening: semi-GF, i.e. 22-23 balanced, 8-8.5 tricks on ♥/♠ or 9-9.5 tricks on ♦/♣. Default response is 2♦, followed by a natural rebid. - 2♦ opening: absolute GF. Responses are based on the old Albarran 2♣: 2♥: negative (0-7 HCP, no aces, at most one king) 2♠: one major-suit ace 2NT: 8+ HCP or 2 kings, but no aces 3♣/♦: ace of ♣/♦ 3♥: 2 aces same color 3♠: 2 aces same rank 3NT: 2 aces same shape Followups are natural. - 1♥/♠ - 2NT: limit raise with 3-card support, so: - 1♥/♠ - 3♥/♠: limit raise with 4-card support - Landy against opps' 1NT - Drury (1-way; the SEF book says 2NT with 4-card support, but very few actually play it) - Stayman is always inv+ (no garbage Stayman); 1NT - 2♣ - 2NT shows both majors - (1♣) 2♣ is natural; (1♣) 2♦ shows both majors, as over a 1♦ opening; - Specific Michaels over 1♥/♠.