Feature request: Make it possible to search for games with a specific position (SFEN / Handicap)

Currently, the advanced game filtering does not support the specification of positions.

I want to filter games by position(SFEN and/or Handicap presets), both for starting and gaming.

- I often play and enjoy handicap games with both my friend and AobaKomaochi. So, the filtering feature for starting positions helps with my research.
- If any positions can be filtered with SFEN, which helps in considering the middle strategy even though it was not a handicap game.

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Good idea!

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