nba

NBA Power Rankings: 40-20 rule defines true contenders

As teams enter the second half of the season, Yahoo Sports' power rankings analyze the "40-20 rule" to identify legitimate championship contenders.

Based on Phil Jackson's "40-20 rule"—winning 40 games before losing 20—the Oklahoma City Thunder and Detroit Pistons are currently the only teams qualifying as true contenders.

The Boston Celtics and San Antonio Spurs are close, while the Denver Nuggets, Houston Rockets, and New York Knicks have not yet met the criteria as the season progresses.