Woods’ Temporary Immovable Obstruction Interference
San Francisco – Tiger Woods’ approach to the 14th hole flew the green and came to rest near a grandstand. Grandstands that have been erected for the championship are considered to be Temporary Immovable Obstructions (TIO). As such he was entitled to relief as covered in Appendix Ib-7 – Temporary Obstructions. In order to provide consistent relief and expedite play, many grandstands and other structures around greens are covered by a special extension to the TIO Rule which requires the player seeking relief to use a drop zone that has been placed in front of the TIO.
Woods dropped his ball in the drop zone, chipped on, but unfortunately missed his par putt.
For more on TIOs, see this video.
Written by John Van der Borght, Manager of Rules Communications for the USGA.