Rectangle Forcing Chains
Rectangle Forcing Chains: Follows every branch of a choice and keeps what they all agree on.
How it works on this board
Every valid state of the rectangle makes 9 false
8
5
1
6
1
3
9
8
9
1
4
3
6
1
7
7
6
2
1
8
3
9
1
7
7
1
8
1
5
6
2
9
1
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