I like it!
To make this great variant of chess, more competitive...
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Interesting idea to measure performance, @Christopher_Parsons. I also like it.
It's much easier to capture a king after the side has lost than it is to give a checkmate usually
Player Efficiency Rating = { ( Total Points scored / Games played = Points per game) (Points per game / ( Moves played / Games Played ) = Points per move) ( Checkmates + ( Wins × 3 ) - Losses) × Points per move ) = Player Efficiency Rating) }
A hypothetical model:
1000/50=20
20÷(750/50)=1.33
18+(10×3)=8
8×1.33=10.64
If you wanted to multiple it by 100, to make it appear more Elo like, the rating would be 1064