Blind side checks aren't illegal though, in the LHBPA or NAH rules (but were for this years Worlds, only)
Checks to the back are, and checks below the elbow on the steering arm (in Worlds and LHBPA, not sure about NAH)
Forearm checks are legal in the NAH rules, not in this years Worlds, or LHBPA rules.
Also a long discussion on off the ball checks, which has some discussion on blind side checks too: http://leagueofbikepolo.com/forum/rules/2012/12/17/offball-contact
Some good discussion on what a blind-side even is (is it based on the ball, the steering arm, where the player is looking, etc....)
If there was such a rule, I would prefer to have it defined by steering arm.
@H-Bomb started
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Blind side checks aren't illegal though, in the LHBPA or NAH rules (but were for this years Worlds, only)
Checks to the back are, and checks below the elbow on the steering arm (in Worlds and LHBPA, not sure about NAH)
Forearm checks are legal in the NAH rules, not in this years Worlds, or LHBPA rules.
Also a long discussion on off the ball checks, which has some discussion on blind side checks too: http://leagueofbikepolo.com/forum/rules/2012/12/17/offball-contact
Some good discussion on what a blind-side even is (is it based on the ball, the steering arm, where the player is looking, etc....)
If there was such a rule, I would prefer to have it defined by steering arm.