Filtering on ELO

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I got a useful suggestion at the talkchess forum for filtering the ELO rating of players. Rather than allowing individual ranges for white and black, I decided to provide a single range that applies to both the white and black player. In the example below, only games where both players have an ELO rating in the range "1200-1700" will be shown. Leaving the lower or upper field empty effectively makes that field unbounded (for "1200-" means all ELO rating 1200 and above, while "-1700" means all ELO ratings 1700 and below).



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