| Did interference occur? | NO | NO LET |
| YES | ||
| Could the obstructed player have reached the ball? | NO | NO LET |
| YES | ||
| Was the obstructing player making every effort to move clear? | NO | STROKE TO OBSTRUCTED PLAYER |
| YES | ||
| Was the obstructed player in a position to play a winning stroke? | NO | YES LET |
| YES | ||
| STROKE TO OBSTRUCTED PLAYER |