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# Empty Rectangle pattern in [r2b9]
*-----------------------------------*
| . . . | . . . | . . . |
| / X / | / / / | / X / |
| . . . | . . . | . . . |
|-----------+-----------+-----------|
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
|-----------+-----------+-----------|
| . . . | . . . | / X / |
| . * . | . . . | X . X |
| . . . | . . . | / X / |
*-----------------------------------*
Here is an example of (what I call) a Dual Empty Rectangle configuration. It has three potential eliminations.
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# Dual Empty Rectangle pattern in [r2b79]
*-----------------------------------*
| * . . | . . . | . . . |
| / X / | / / / | / X / |
| * . . | . . . | . . . |
|-----------+-----------+-----------|
| . . . | . . . | . . . |
| . . . | . . . | . . . |
| . . . | . . . | . . . |
|-----------+-----------+-----------|
| X / / | . . . | / X / |
| X * X | . . . | X . X |
| X / / | . . . | / X / |
*-----------------------------------*
Here is another example of a Dual Empty Rectangle configuration. It has fifteen potential eliminations.
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# Dual Empty Rectangle pattern in [r2b79]
*-----------------------------------*
| . * . | . . . | . * . |
| / X / | / / / | / X / |
| . * . | . . . | . * . |
|-----------+-----------+-----------|
| . * . | . . . | . * . |
| . * . | . . . | . * . |
| . * . | . . . | . * . |
|-----------+-----------+-----------|
| / X / | . . . | / X / |
| X * X | * * * | X * X |
| / X / | . . . | / X / |
*-----------------------------------*
Do either of the last two examples already have a name, or are they just thrown in with generic single-digit chains?