A 100% 1st PC pattern.

This is really hard to solve. If you're a beginner, try the Perfect Clear Opener or Grace System for your 1st PC.

ILSZ has 22 minimal solutions.


When you place an O on the furthest right, you have a 92.26% (1550/1680) chance of achieving a perfect clear. However, if you have an O as your 1st, 2nd, or 3rd piece of your second bag, you will have a 100% chance of achieving a perfect clear.

This field has 33 solutions which you can find here.


From the above field, if you place J and O like below, your chance to do a perfect clear will be 58.33% (490/840).

This field has 15 solutions.

The following pattern is useful to know not only for ILSZ but also for perfect clears in general.

See Also

Perfect Clears

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