regression/games/life_and_death/ld9_variations.sgf

(;GM[1]FF[3]
RU[Japanese]SZ[19]HA[0]KM[5.5]
PW[White]
PB[Black]
GN[ld9_variations]
DT[2000-05-28]
SY[Cgoban 1.9.2]TM[30:00(5x1:00)];;
AW[db][eb][nb][ob][dc][oc][pc][dd][pd][be][ce][de][pe][qe][re][bf][rf][bm][rm][bn][cn][qn][rn][co][do][po][qo][dp][pp][dq][eq][pq][er][fr][or][pr]
AB[cb][pb][qb][cc][qc][bd][cd][qd][rd][bo][ro][bp][cp][qp][rp][cq][qq][cr][dr][qr]
(;B[bb]C[Critical.
attack: A17, C19
defend: A17, C19, A16, A18
]PL[1]
(;B[ae];W[ca];B[ba];W[ac];B[ab];W[ad])

(;B[da];W[ac];B[ad];W[ca];B[ab];W[ba])
)

(;B[ab]C[Critical.
attack: B19
defend: B19, A16, B18, C19
]PL[1]
(;W[ba];B[ca];W[ad];B[ac];W[bb])

(;W[ad];B[ba];W[ac];B[bc])

(;B[da];W[ba];B[bb];W[ca])

(;B[ae];W[ba];B[ca];W[bb];B[bc];W[ad])
)

(;B[ad];W[ae]PL[1]
C[Critical.
attack: C19, B19, B18, A18
defend: A18, B18
]
(;W[da]C[Ko.
]
(;B[bb]
(;W[ba];B[ca];W[ab])

(;W[ab];B[aa];W[ba];B[ca];W[ac];B[aa])
)

(;B[ab];W[ba];B[ca];W[bb])
)

(;B[da];W[bb];B[ab];W[ba];B[bc];W[ea])
)

(;B[ca];W[da]PL[1]C[Critical.
attack: A16, A17, A18, B18
defend: A18
]
(;W[ac]
(;B[ad];W[bb]
(;B[ba];W[ab])

(;B[aa];W[ab])

(;B[ab];W[aa];B[ba];W[ab])

(;B[bc];W[ab])
)

(;B[ab];W[ad]
(;B[bc];W[ba];B[ae];W[ad])

(;B[ba];W[bc])
)
)

(;W[ba]C[ko
];B[bb];W[ac];B[ad];W[ab])

(;W[aa];B[ab];W[ac];B[ba])

(;W[ab];B[bb];W[ac];B[ad];W[aa])

(;W[bb];B[ab];W[ba])

(;B[bb]C[ko
];W[ac];B[ad];W[ab];B[aa])

(;B[ab];W[bb];B[ba];W[ac];B[bc])
)

(;B[ad];W[ae];B[ca];W[da]PL[1]
C[Critical.
attack: B18
defend: A18, B18
]
(;W[ba]C[ko
];B[bb];W[ab])

(;W[ab]C[ko
];B[bb];W[ac];B[aa])
)

)