(;
AB[cr][cq][ds][er][eq][dp][do][cn][bn]
AW[an][bm][cm][dn][en][eo][ep][fq][fr]
C[Black plays.

Source:
   The Endgame, Chap. 3
   Tomoko Ogawa & James Davies, Ishi Press]
(;
B[bo]
C[Obvious, but slack!];
W[ao];B[ap];W[am];B[bp]
C[Black ends in gote.  Black can do better.]
)
    (;
    B[bp]
    C[Best!

Now any further White moves end in gote for White.  So ...]
    (;
    B[ao]
    LB[bo:A]
    C[... blocking here is Black's privilege.  Black's territory is 2 points better than when Black starts from the original position with A and ends in gote.]
    )
        (;
        W[ap]
        C[White can reduce Black's corner, but ...];
        B[aq];W[ao]
        C[... White ends in gote.]
        )
    )
)

