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cso 215 gate for twelve
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by
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dustin
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DUSTIN                            2021-12-20 22:04
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SOLUTION FREE! TEN FIREFLIES ARE JUST ENOUGH TO KEEP THE GATE OPEN UNTIL ^ HAS PUSHED THE | THROUGH.   
  
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4^6  
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THIS IS THE CAVESCANNING ORDER AROUND ROCKFORD, WHERE OUR HERO IS AT POSITION 5.ELEMENT 6 IS SCANNED DIRECTLY AFTER ROCKFORD. SO IF POSITION 6 IS OCCUPIED BY A FIREFLY AND 8 IS A VERTICAL-GROWING WALL, THEN IF ^ MOVES, THE FIREFLY CAN IMMEDIATELY OCCUPY HIS POSITION BEFORE THE GWALL GETS THE CHANCE TO CLOSE THE GATE. THE SAME LOGIC WORKS IF 5 IS OCCUPIED BY A FIREFLY AS WELL. SO THE CAVESCANNING ORDER ALLOWS THE WHOLE "FIREFLY SNAKE" TO MOVE THROUGH THE GATE BEFORE IT'S CLOSED.