Woods avoided sanction (Getty Images).

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Tiger Woods was involved in a long rules discussion at the end of his action-packed first day in the Masters, but came out of it with no penalty being added to his score.

Officials studied video of the three-time champion tapping in for par on the 14th hole - his fifth - after at least one spectator rang in with a query, but tournament chairman Will Nicholson said: "The tape was inconclusive."

The ruling in question concerned "standing astride on on the line of putt,", which states that a player "must not make a stroke on the putting green from a stance astride or with either foot touching the line of putt or an extension of that line behind the ball".

England's Brian Davis was disqualified from an event in Germany for breaking the rule and signing his card before the infringement came to light.

Woods played only 12 holes on Thursday following the five-and-a-half-hour rain delay, but they were eventful to say the least.

On the 13th he was putting for eagle, but ended up with a bogey six after sending the ball past the hole and into Rae's Creek.

At the first he hit the flagstick with his approach, rebounded into a bunker and bogeyed. Then on the long second his hooked drive hit the trees and went only about 100 yards, but he scrambed a par.

At two over par Woods was resuming on Friday six adrift of leader Chris DiMarco, who still had four holes of his first round to go.