CORVALLIS, Ore. — Washington State knows it plays sound enough defense to withstand a prolonged offensive drought. So when it took the Cougars nearly all of the first 12 minutes to score six points, they knew the game was far from over — so far, in fact, that they were able to take a 21-19 halftime lead. But when WSU came out in the second half and repeated its offensive anti-heroics, there was no comeback in order. The Cougars scored three points in the first 71/2 minutes after halftime, fell behind by 15, and lost 58-51 to Oregon State at Gill Coliseum. The loss dropped the Cougars a half-game behind Oregon State into eighth place in the Pac-10 men's basketball race.