Former Test leg-spinner Stuart MacGill took two wickets in an over after tea on Friday to have NSW closing in on an outright victory with South Australia to resume on Saturday's third day on 123 for three - still 278 runs behind.
Nathan Bracken, who claimed 7-4 in SA's near record low score of 29, hit a six to single-handedly beat SA's first innings total after Phil Jaques had cracked a double century.
NSW captain Brad Haddin declared on 430 for nine after Jaques recorded his third first-class double ton, and first for NSW, with a dashing 430-minute, 340-ball innings of 217 highlighted by 30 fours and a six.
He put on 231 runs with all-rounder Dominic Thornely, who made 78.
Victoria made a bright start in their bid to equal history by moving to 89 for one at stumps on day three of their match against Western Australia in Melbourne.
Victoria need to score 455 to win the match -- 366 more to go -- to equal their most successful run-chase, set against NSW in January.
Openers Matthew Elliott (52 not out) and Graeme Rummans (27) got their side off to a good start with an 82-run opening stand before the latter was bowled by Kade Harvey off the fourth-last over of the day.
WA declared their second innings at 329 for six on the back of a magnificent 153 by left-handed opener Chris Rogers.
In Melbourne (day three): Western Australia 277 (M. Goodwin 130, S. Marsh 34; S. Harwood 3-50, M. Inness 3-68) and 329 for 6 declared (C. Rogers 153, M. North 57; I. Harvey 3-53) v Victoria 152 for 9 (M. Elliott 65, C. White 39; B. Dorey 3-26, B. Edmondson 3-42) and 89 for 1 (M. Elliott 52 not out)
In Sydney (day two): South Australia 29 (N. Adcock 8; N. Bracken 7-4) and 123 for 3 (T. Plant 64 not out, C. Ferguson 41 not out; S. MacGill 2-39) v New South Wales 430 for 9 declared (P. Jaques 217, D. Thornely 78; S. Tait 3-137)