Gurth's Symmetrical Placement
Uses the symmetry of the givens to pair digits up, deciding or removing candidates at mirrored cells.
How it works on this board
The givens preserve one consistent digit mapping under the symmetry
3
7
6
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8
2
4
3
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7
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1
7
5
3
2
3
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8
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5
8
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1
6
8
4
2
7
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7
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7
1
5
8
3
4
6
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