With just six weeks to go until a referendum on Scottish independence, the debate highlighted the increasingly bitter campaign as the two combatants quarrelled fiercely over a new Scottish currency and the ability of Scotland to go it alone.
Scottish First Minister Salmond, leader of the Scottish National Party (SNP), had been expected to dominate the debate with Darling, a fellow Scot and leader of the "Better Together" campaign, and to erode the lead of the 'No' campaign.
Salmond insisted retaining the pound would not be a problem, and hit back by asking Darling repeatedly whether he believed Scotland could successfully be an independent country, a question his opponent dodged.
A snap ICM poll for the British-based Guardian newspaper showed 47 per cent of viewers believed that Darling had won while 37 per cent thought Salmond came out on top.
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"I don't think it was Alex Salmond's best night," said Iain Macwhirter, a political commentator for the Sunday Herald, which in May became the first paper to officially back independence.
"Sometimes Alex Salmond's attempt to be statesmanlike looked liked complacency and I am not sure that will have gone down terribly well with the voters."
The online headline of the paper's daily edition, The Herald -- which has yet to state its position -- said Darling had "drawn first blood", while the pro-union Daily Record said Darling had "torn into" Salmond.
Meanwhile, the SNP pointed to a four-person poll of previously undecided voters in the Daily Record, all of whom said they would now vote 'Yes' to independence.