OFFSET
1,1
LINKS
Sensei's Library, Corner shapes
EXAMPLE
2534 has the binary expansion 100111100110. Sorting into a quadrant shape (like in A165197, the least-significant digit into the corner) leads to:
0110
101
01
11
0
If the "0" top left is in a Go board corner and only the 7 digits "1" are Go stones of the same color, then all these 7 stones surely live, no matter where stones or chains of the other color with freedom(s) are. Removal of any of the 7 "1"-stones removes this sureness (for the remaining stones).
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Leonhard Kreissig, Oct 16 2009
STATUS
approved