{5} Static Region Forcing Chain

With this solving technique, we will prove the following assertions:

Because the value {1} cannot be placed elsewhere in {2}, and the results are the same, we can conclude that {3}.

Each assertion is proved by a different chain of simple rules. The chain is static, which means that each step in the chain relies only on what we see the grid, not on the results of previous assertions (ie "Dynamic Chaining").

{6} {7}

The details of each chain are given below. Use the view selector below the grid to switch between the graphical illustrations of the different chains.

{4}