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How many points are won/lost during this exchange?

$$ six=two $$ -.a..... $$ -....... $$ -...OOOO $$ -4....XO $$ -1OOOOOX $$ -XOXXO.X $$ -2X5.XX. $$ -3...... $$ -------- White territory around a is safe. Move 2 and 4 can be swapped for identical ...