Attrition
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Like Destruction, but points are awarded by damage dealt, not just kills.

Point of damage inflicted on opponent...+1
Destroying enemy weapon...+50
Destroying enemy 'Mech...+500 + Tonnage Bonus
Tonnage bonus for kills...(target tonnage - attacker tonnage) x5 = bonus (if negative number, then it's 0)

Point of self-inflicted damage...-1
Destroying own weapon...-50
Destroying own 'Mech...-500
Killing teammate...-500

Note that the score losses are generally only for self-inflicted damage.  Being killed by another player only adds to their score, it doesn't hurt yours.