ARLINGTON — Arlingtons first trip to the regional quarterfinals in 23 years turned into a ticket to the regional semifinal Tuesday night.And a packed house was there to witness it. The Colts, propelled by first-half goals from Cesar Garcia and Steven Chavez, held on in the waning moments for a 2-1 victory over rival Arlington Sam Houston at Cravens Field. Arlington (19-4-2) advances to play Flower Mound Marcus, a 2-0 winner over Flower Mound, in a Class 5A Region I semifinal at 4 p.m. Friday at Midland's Scharbauer Complex.The game was contested in front of a raucous crowd of at least 2,500.Its like a dream, Garcia said. I always wanted to play in front of fans like this, but I never thought it would happen. As the game went on, the crowd just got bigger and bigger.Garcias rebound put-back in the 15th minute tied the score after Sam Houston jumped out to a 1-0 lead. A crisp shot came right off Texans goalkeeper Leo Lujan, and Garcia said he flattened out more toward the ball for the easy chip-in. We were down after their first goal, he said. I really think it got us going though. We started to play more aggressive and kind of take control offensively.It was Chavez that ended up with the game-winner in the 25th minute.The Colts worked the ball left, and Jack Wheeler was able to center a pass for the breaking midfielder. Chavez sent a shot past Lujan for the lead. Sam Houston (12-8-4) couldnt get lucky in the second half, despite almost twice as many possessions. Tony Guzman gave the Texans a 1-0 lead in the 8th minute when he put back a rebound off Mark Tachiris shot. Juan Martinez had two shots on goal in the 74th and 76th minutes but couldnt find the net. In 16 years of coaching soccer, I never thought I would see an atmosphere like this, Arlington coach Jeff Waldrop said.This is Arlingtons first regional semifinal appearance since a trip to the state tournament in 1991.