(;
AB[rk][pl][ql][sl][pm][on][oo][op][oq][pq][qq]
AW[rl][qm][rm][sm][pn][po][pp][qp][rq][qr][rr]
C[Black plays.

Source:
    Problem #7 from the yose volume of Gokyo Seimyo, a nearly 200 year old problem set.

Analysis:
    Myron Souris]
(;
B[qn]
C[Correct.];
W[rn];B[rp]
(;
W[qo]
C[White cannot save all his stones with this move.];
B[ro]
C[And White is going to lose more than just the 5 stones in atari.]
)
    (;
    W[sk]
    C[This move doesn't make White happy either.];
    B[ro]
    C[And again, White is going to lose more than just the 4 stones in atari.]
    )
    (;
    W[ro]
    C[White can connect the upper and lower group fragments, but ...];
    B[qo];W[sp]
    C[... Black captures 4 stones in sente.]
    )
)
    (;
    B[ro]
    C[This "Go 101" eye-stealing tesuji doesn't work here!];
    W[rp]
    C[White simply connects to save all his stones.];
    B[qn];W[sk]
    C[White's extra freedom prevents any snapback or liberty shortage.]
    )
)

