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[FEN "QQQQQbBk/QQQQQBQB/QQQQQRBK/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ b - - 0 1"]

1... Bxg7

I'm getting +518 for this.

That could be improved to +520 if we allow a black pawn on the 8th rank instead of the bishop, since this position is obviously already impossible for a number of other reasons.

[FEN "QQQQQbBk/QQQQQBQB/QQQQQRBK/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ b - - 0 1"]

1... Bxg7

I'm getting +518 for this.

That could be improved to +520 if we allow a black pawn on the 8th rank instead of the bishop, since this position is obviously already impossible for a number of other reasons.

Edit: Found a better one.

QQQQQQNk/QQQQQQNp/QQQQQQKN/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ b - - 0 1

This is +530.

[FEN "QQQQQQQQ/QQQQRQRB/QQQQQpBk/QQQQQBQB/QQQQQRBK/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ b - - 0 1"]

1... fxg5

I'm getting +506 for this.

[FEN "QQQQQbBk/QQQQQBQB/QQQQQRBK/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ b - - 0 1"]

1... Bxg7

I'm getting +518 for this.

That could be improved to +520 if we allow a black pawn on the 8th rank instead of the bishop, since this position is obviously already impossible for a number of other reasons.

[FEN "QQQQQQQQ/QQQQRQQQ/QQQQBpBR/QQQQRBQB/QQQQBkBK/QQQQRBRQ/QQQQQQQQ/QQQQQQQQ b - - 0 1"]

1... fxg5

I'm getting +486 for this.

[FEN "QQQQQQQQ/QQQQRQRB/QQQQQpBk/QQQQQBQB/QQQQQRBK/QQQQQQQQ/QQQQQQQQ/QQQQQQQQ b - - 0 1"]

1... fxg5

I'm getting +506 for this.