What is squeezing?
This question gets asked over and over on the forums; the simple answer is that squeezing is starting a star power activation slightly late, and playing the last note or two of your activation slightly early, so that they are included in your star power section, and thus get you more points.

How to squeeze
First, remember to activate the select button very, very slightly before the first note, but not at the exact same time. You should hit the select button, then immediately strum the note, in one fluid motion. And remember, do this slightly after the note. At the end of the activation, simply strum the last note slightly ahead of the beat. The timing window on GH is huge, so usually you can push this a lot more than you think.

How do I know if I got the squeeze?
It's sometimes hard to judge if you activated a squeeze correctly, especially at the end. Watch the last note carefully, and see if the color changes back to its normal color just before you strum. Another technique you can use is to pause your game (assuming there is a rest in the music!), and write down your score, to see how it compares with other times through the same passage.

Advanced technique
Once you get good at squeezing, you can really push your squeeze to the very edge of the timing window. In some cases in fast passages, it is actually possible to squeeze in an extra note (or more) beyond what you could normally squeeze.

PLAY DETAILS:

On-site staff will compile the registration forms from participants prior to their playing.
Game will be played in Pro Face Off mode. Players will compete in the order they signed up. No substitutions or replacements are permitted. Players shall not be permitted to select the songs to be used, but shall compete to one of the following songs which will be played repeatedly, in below order:
→ Miss Murder
→ Welcome to the Jungle
→ 3's and 7's
→ Bulls on Parade

Game at each location to be on expert level of difficulty
The chosen character and guitar will not affect gameplay.
Players must use provided Les Paul controllers to compete. No personal or modded guitars will be allowed.
Players will play a predetermined song.
Players will be paired off in the order they signed up for the contests in-store.
Any attempts to distract or disrupt a player during a round are prohibited.

ELIGIBILITY: only open to legal residents of United States of America who are 18 years or older. Employees, officers and directors of BP, Activision and Guitar Hero and each of their respective parent companies, subsidiaries, owners, partners, agents, affiliates, dealers, distributors, retailers and advertising and promotion agencies, as well as the immediate families and those living in the same households of each are not eligible to play.

TO WIN: The winner of each match will be determined by high score. No prizes shall be awarded for the winner of each individual match. If scores are tied at the end of the four-hour competition, highest note percentage will determine winner. If note percentage is tied, then highest note streak will determine winner. If the note streak is tied, the first player to achieve that score shall be deemed the winner. The contestant with the highest overall score at each in-store contest location will be called back to compete at the final event

PRIZES: Prizes will be awarded to the highest scoring player from each contest location, with 12 prizes awarded in Illinois and 12 prizes awarded in Georgia. Winners from each Chicago-area in-store contest will receive four (4) tickets to an intimate OK GO! concert and be invited to play in a final event, both of which will be held at the House of Blues in Chicago on April 14, 2008. Winners from each Atlanta-area in-store contest will receive four (4) tickets to an intimate Alter Bridge concert and be invited to play in a final event, both of which will be held at The Tabernacle on April 3, 2008. One grand prize will be awarded at each final event, consisting of a guitar, Xbox gaming system, Guitar Hero III game, and a basket of ampm goods valued at $300.

TO VERIFY/CLAIM PRIZES: Finalists will be determined after the ampm in-store competition is complete and scores have been tabulated. Finalists will be notified via telephone for eligibility to play at final event and may be required to sign and return an affidavit of eligibility and compliance with these Rules, a publicity/liability release (unless prohibited by law), and any other requested documents to implement the contest. Failure to comply with this requirement may result in disqualification. Finalists are solely responsible for any and all expenses related to participation in the final event, including but not limited to travel and accommodation expenses.