(;GM[1]FF[4]CA[UTF-8]SZ[19]AB[rr][qr][pr][or][bo][co][cp][dq][dr][ds][bc][cc][dc][ec][eb][mb][mc][nc][od][pd][qd][rd][rc]AW[rq][qq][pq][oq][nq][mq][lq][ro][cr][cq][bp][ap][cs][fb][gc][fd][ed][dd][cd][bd][bf][rb][qc][pc][oc][nb][na]C[Upper right: black to play, find the best move
Lower right: best move for black
lower left: best move for black
upper left: what is the status of the black group?];B[tt];W[bb];B[ab];W[cb];B[ca](;W[ba];B[da]C[Seki];W[tt](;B[sr];W[nr];B[os]C[easy :-)];W[tt];B[ra](;W[sb](;B[qb];W[pb];B[pa];W[qa]C[ko];B[tt];W[tt](;B[br];W[bq];B[ar]C[dead])(;B[ar]C[does this work?];W[br];B[ao];W[as]C[ko, so a failure for white. ]))(;B[pa];W[pb];B[ma];W[ob];B[qb]C[ko]))(;W[qb];B[sb];W[pa];B[ob]))(;B[nr];W[sr];B[mr];W[lr]C[6 die 8 live];B[ms];W[rs];B[qs];W[os]))(;W[da];B[ba];W[aa];B[ba]TR[da][ca]CR[ca](;W[ea];B[db]C[Thanks to the liberty black can squeeze]TR[fc])(;W[ca];B[ea];W[aa];B[ac];W[fa];B[db]C[again thanks to the liberty, black can atari])))