for (i<-0 until some.length)
basically means, in java-ish code:
for (int i=0; i < some.length; i++)
So, the reason we were only getting a 7x7 board was because Scala iterates using the "until" as non-inclusive to the some.length (i.e. less than).
for (i<-0 until some.length)
for (int i=0; i < some.length; i++)