SAN ANTONIO — The Lakers were halfway to their best victory of the season, with a solid first half tonight against the San Antonio Spurs. Kobe Bryant was clearly playing frustrated, but he was playing with emotion. He scored eight points on 4-for-14 shooting in the first half. He made four of his first five shots, then clanked nine in a row. Pau Gasol was superb in the opening half, with nine points, six rebounds and four assists. Tony Parker scored 14 points on 6-for-12 shooting for the Spurs. Tim Duncan was scoreless.