MORNE
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TETRIO / SOLO / BLITZ

Single. Double.
Perfect clear.

Follow the first-bag T-spin single, second-bag T-spin double, then the third-bag PC. Both required spins matter; a matching stack is not a substitute for executing the spin.

Source: John Beak’s SDPC catalogue ↗. The source lists 23 Default solves and 70 Alt solves, alongside setup, minimal and recovery diagrams. Browse every extracted diagram below or open its original fumen.

Published figures: first-bag buildability 75% with mirrors; Default PC 98.45%; Alt PC 99.13%. These are source claims. The fresh bot catalogue has not yet passed complete native route and coverage validation.

How the loop fits together

Five seven-piece bags contain 35 tetrominoes: 140 cells, or 14 complete rows. A successful loop ends on an empty board at the next bag boundary. HOLD and the saved piece are part of that accounting.

Bag 11–7 · SDPC T-spin single
Bag 28–14 · T-spin double
Bag 315–21 · PC + saved piece
Bag 422–28 · DPC setup
Bag 529–35 · DPC finish

SDPC clears eight lines using 20 placed pieces, leaving the 21st piece for DPC. DPC uses that saved piece plus the following two bags: 15 pieces clear six more lines, typically through a T-spin double followed by a perfect clear. A documented SDPC recovery may place the extra piece first and enter a matching recovery-DPC residue instead.

The other common entry is a four-line first PC followed by a four-line second PC. Together they use 20 pieces and reach the same one-piece-leftover boundary. An empty board alone does not establish the correct bag position: track actual pieces consumed and HOLD.

Published diagram library

Filter by stage, solve family or recovery. Grey cells are the existing stack. Colours identify the pieces being added. Multi-page links open the whole source fumen; the card indicates its page.