Switzerland scraped into next year's World Cup, their fourth finals in a row, after being held to a goalless draw at home by a valiant Northern Ireland team in Basel.
The Swiss qualified 1-0 on aggregate, the tie ultimately being decided by the hugely controversial penalty converted by Ricardo Rodriguez in the first leg in Belfast on Thursday.
Switzerland could have done it in style as they dominated the first hour but squandered a hatful of chances.
It would have have been very different had Jonny Evans' stoppage-time header not been cleared off the line, fittingly, by Ricardo Rodriguez, the man who converted from 12 yards in Belfast to send Switzerland to their fourth straight World Cup.
O'Neill's bold team selection, which featured four changes and Stuart Dallas despite an injury concern, was reminiscent of the way he shuffled his pack against Ukraine at Euro 2016 when Northern Ireland were facing elimination after a poor performance against Poland.
And, as on that occasion, there was a vast improvement. The Northern Irish failed to register a single shot on target in Belfast but they threatened three times in the opening five minutes in Basel, most notably when Brunt's long-range effort was pushed behind by Yann Sommer.
The Swiss finally awoke as Haris Seferovic glanced Xherdan Shaqiri's cross wide and Blerim Dzemaili's drive across the six-yard box was diverted over by Gareth McAuley's outstretched leg.
The visitors were pressing higher, with more energy and in greater numbers, and the tension that was on the field in Belfast was instead in the stands here as another rasping Brunt effort tested Sommer.
Michael McGovern was keeping the visitors in the tie, saving at his near post from Shaqiri and with his legs from Steven Zuber, as his outfield team-mates notably tired on a quagmire of a pitch ruined by rain.
The first big chance the visitors were craving came nine minutes after the break with a terrific counter instigated by George Saville.
His pass to the right flank was seized upon by Jamie Ward and the Nottingham Forest winger's cross was met by a Conor Washington header that just looped past Sommer's far post.
That seemed to spook Switzerland into settling for what they already had as Northern Ireland started to take control, even if further chances were not forthcoming.
O'Neill brought on the more physical Josh Magennis and debutant Jordan Jones and switched to a 4-4-2 that soon featured centre-back Gareth McAuley as one of the forwards.
Seferovic spurned another chance - which probably contributed to the boos he received when taken off shortly after - and there was to be one final chance for the visitors.
Sommer completely misjudged Brunt's deep cross and Jonny Evans was at the back post to meet it only for Rodriguez to hack off the line in what was the game's final chance.
More to follow.
