(;
AB[ab][bc][cc][ce][de][bf][ed][fc][gc][gd][ge][ef][ff][eg][ig][jg][kf][lg][jd][kc][ld][le][me][oe][pe][qd][rc][re]
AW[bb][cb][dc][dd][eb][fb][gb][hb][ic][jb][kb][id][ie][if][hg][gf][fg][kd][lc][mc][md][oc][od][pd][qc][qb][fe]
LB[ec:A][ke:B][rb:C]
C[Rank Black's moves A, B, and C.  Then find the best endgame sequence.

Source:
   The Endgame, Chap. 2
   Tomoko Ogawa & James Davies, Ishi Press]
(;
LB[ec:A]
C[The move at A is only the 2nd best move, and is 4 points in gote.]
(;
B[ec]
C[A Black move here surrounds 4 points, but later, ...];
B[cd]
C[... a play here is Black's privilege.];
W[db]
C[Now see the variation for when White plays 1st.]
)
    (;
    W[ec]
    C[If White plays 1st here, ...];
    W[cd]
    C[... later, a move here is White's privilege.];
    B[bd]
    LB[ee:A][fd:B][db:C]
    C[Compared to the previous Black variation, Black loses a point blocking here, White gains a point at C, and later, Black will lose 2 more points, having to fill in at A and B.

So the difference between White or Black playing 1st is 1+1+2, or 4 points in gote.]
    )
)
    (;
    LB[ke:B]
    C[B, the smallest move, is 3.5 points in gote.]
    (;
    B[ke]
    C[A Black capture only yields 1 point.  Black cannot make any territory here.]
    )
        (;
        W[jc]
        LB[je:A]
        C[A White play here saves 1 stone and captures 1 stone for 2 points.

The White follow up at A makes 3 more points, but in gote.  So the value is only half that.

The total value is therefore:
2 + (1/2 * 3) = 3.5]
        )
    )
    (;
    LB[rb:C]
    C[C, the largest move, is 2- points in double sente.]
    (;
    B[rb]
    C[A Black move here is sente ...];
    W[ra]
    LB[qa:A]
    C[... otherwise Black A is sente.]
    )
        (;
        W[rb]
        C[And a White move here is sente ...];
        B[sb]
        LB[sc:A][ra:B]
        C[... otherwise White A is sente.

The situation is double sente, because whoever goes 1st gains 2 points in sente.

(Actually, the possibility of Black B complicates the exact scoring a little bit more, but not enough to change the overall situation.)]
        )
    )
    (;
    B[rb]
    C[So the correct endgame sequence is the following.];
    W[ra];B[ec];W[jc];B[cd];W[db];B[je]
    )
)

