(;
AB[ro][rp][qp][pq][pr][mr][nr][or]
AW[qm][rn][po][pp][qo][so][lp][lq][lr][np][oq][qq]
C[Black plays.]
(;
B[rr]
C[Slack.];
W[rq];B[qr];W[sp];B[sr]
C[Black lives, but is many points worse than optimal.]
)
    (;
    B[qr]
    C[Even worse.];
    W[rr];B[rq];W[sq]
    C[With a liberty shortage, Black cannot make a 2nd eye in the corner.]
    )
    (;
    B[rq]
    C[Best move.];
    W[rr]
    C[White may be hoping for a squeeze, but ...]
    (;
    B[sq]
    C[... making an empty triangle is sometimes good!];
    W[qr];B[sr]
    C[White is the one with the liberty shortage.  So Black captures the 3 stones to save all the stones.]
    )
        (;
        B[qr]
        C[Big mistake.];
        W[sq]
        C[Black cannot make an eye in the corner.]
        )
        (;
        B[sr]
        C[Same mistake.];
        W[sq];B[qr]
        C[Avoids the snapback, but ...];
        W[ss]
        C[... Black still cannot make eyes.];
        B[qs];W[sp];B[ms];W[os]
        )
    )
)

