The second of two interesting life and death tesuji pulled from some games played by a friend of mine. According to him, after this exchange, black resigned: "what just happened...?"
(;SZ[19]AW[em]AW[dn]AW[gn]AW[bo]AW[ho]AW[cp]AW[dp]AW[hp]AW[aq]AW[bq]AW[gq]AW[hq]AW[dr]AW[hr]AW[hs]AB[eo]AB[go]AB[ep]AB[gp]AB[cq]AB[dq]AB[fq]AB[ar]AB[br]AB[er]AB[gr]AB[gs]C[White to kill. Yes, everything.]AW[gm]GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]RU[Japanese]KM[0.00]TM[]PL[W]
(;W[cr];B[eq]
(;W[cs]
(;B[es]C[CHOICE]
(;W[fo];B[ds]
(;W[bs];B[as];W[cr]C[Black is caught! RIGHT])
(;W[fp];B[bs]C[Wha?]))
(;W[bs];B[fo]MA[fp]MA[fr]MA[fs]C[Black gets two eyes.])
(;W[fr];B[fs]
(;W[bs];B[fo]MA[fp]MA[fr]C[Black gets two eyes.])
(;W[fo];B[ds]
(;W[bs];B[as];W[cr]C[Black is caught! RIGHT])
(;W[fp];B[bs]C[Wha?])))
(;W[fs];B[fr]
(;W[bs];B[fo]MA[fp]MA[fs]C[Black gets two eyes.])
(;W[fo];B[ds]
(;W[bs];B[as];W[cr]C[Black is caught! RIGHT])
(;W[fp];B[bs]C[Wha?]))))
(;B[fs];W[fo];B[ds]
(;W[bs];B[as])
(;W[es]C[RIGHT])))
(;W[es];B[cs]
(;W[fr];B[ds]TR[gr]TR[gs]C[White only gets two stones.])
(;W[ds];B[fs]C[No.])
(;W[bs];B[ds]C[No.]))
(;W[bs];B[ds]
(;W[as];B[fo]
(;W[fs];B[fr]MA[fp]MA[fs]C[Black gets two eyes.])
(;W[es];B[fs]MA[fp]MA[fr]C[Black gets two eyes.]))
(;W[cs];B[as];W[cr];B[fo]TR[ar]TR[br]TR[as]C[Clever, but not clever enough. Black is still alive.])
(;W[fo];B[cs]TR[go]TR[gp]C[White only gets two stones.]))
(;W[fo];B[cs]TR[go]TR[gp]C[White only gets two stones.]))
(;W[fo];B[cr]TR[go]TR[gp]C[White only gets two stones.])
(;W[es];B[cr]
(;W[fr];B[ds]TR[gr]TR[gs]C[White only gets two stones.])
(;W[fo];B[ds]TR[go]TR[gp]C[White only gets two stones.]))
(;W[ds];B[cr];W[es];B[fr]C[Black keeps everything.]))