Screenshot beta with editable review: the core 8×8 rule is confirmed, while recognition coverage, piece refresh, and line-clear timing still need more device evidence.

Line-clear evidence

Block Blast Combo and Line Clear Planning

A simultaneous multi-line clear is something the current board model can demonstrate. A live-game Combo multiplier or streak rule requires separate evidence.

Open the solver

One placement, two completed lines

The exact fixture below leaves one shared corner open. Placing the single block at row 1, column 1 completes row 1 and column 1 on the same placement, so both clear simultaneously in the provisional model.

Original engine fixture

The exact input checked

This project-owned board and these three fixed pieces are passed to the production solver unchanged.

Piece 1
single

Piece 2
horizontal-2

Piece 3
vertical-2

Verified simultaneous-clear move

Piece 1

Move 1: single

Top-left: Row 1, column 1
Cleared rows: R1
Cleared columns: C1

Plan opportunities, not an invented multiplier

Consecutive line-clear opportunities can still be useful when comparing legal sequences. The solver counts cleared rows and columns and shows each resulting board; it does not convert those facts into unverified live-game points.

Evidence boundary

The official Combo multiplier, streak continuation or reset timing, and platform or version differences are not implemented. This evidence covers only simultaneous row-and-column clearing after a legal placement under provisional-classic-v1.