space rule

10 LETTERS · STARTS WITH S

space rule is a valid 10-letter word worth 13 points in Scrabble and 17 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

S1P3A1C3E1R1U1L1E1

1 + 3 + 1 + 3 + 1 + 0 + 1 + 1 + 1 + 1 =13 PTS

DOUBLE WORD → 26TRIPLE WORD → 39

MEANING

What does space rule mean?