Japanese rules, komi is 2.5 points. No prisoners. I created this problem to try to explain problem 14203 (Bent-5)
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[9]KM[0.00]
PW[White]PB[Black]AW[da][fa][ha][bb][cb][db][fb][gb][hb][ib][bc][ad][bd][dd][ed][fd][gd][de][ge][he][df][hf][if][dg][eg][ig][dh][eh][fh][ei][fi][gi]AB[aa][ba][ea][ab][eb][cc][dc][ec][fc][gc][hc][ic][cd][hd][id][ae][be][ce][ee][ie][af][cf][ff][ag][cg][gg][ah][ch][hh][bi][ci][di][ii]LB[fe:B]C[White just passed. To claim a win according to bent 4 click B. To win by board play, try it.]
(;B[ca]
;W[ac]
;B[ba]
;W[aa]
;B[ab]
;W[ih]
(;B[ca]
;W[hi]C[Black lost by 0.5 points.])
(;B[hi]
;W[aa]
;B[gh]
;W[ca]
;B[fg]C[Black lost by 5.5 points.]))
(;B[ih]
;W[hg]
;B[gh]
;W[gf]
;B[fg]
;W[fe]
;B[ef]
;W[hi]C[Black lost by 0.5 points.])
(;B[fe]
;W[ef]C[White disputes that the corner is dead! Game enters confirmation phase.]
(;B[ca]
;W[ac]
;B[ba]
;W[aa]
;B[ab]
;W[ih]
(;B[hi]
;W[]LB[aa:A]C[White passes. (A white play at A would be an illegal move because you can only retake a ko after you pass during the confirmation phase .)]
;B[ca]C[RIGHT])
(;B[ca]
;W[hi]C[Black lost]))
(;B[ac]
;W[ca]
;B[ab]
;W[aa]
;B[ba]
;W[gf]
(;B[fg]
;W[]LB[aa:A]C[White passes. (A white play at A would be an illegal move because you can only retake a ko after you pass during the confirmation phase .)]
;B[ac]C[RIGHT])
(;B[ac]
;W[fg]C[Black lost])))
(;B[ac]
;W[ca]
;B[ab]
;W[aa]
;B[ba]
;W[ih]
(;B[ac]
;W[hi]C[Black lost.])
(;B[hi]
;W[aa]
;B[gh]
;W[ac]
;B[fg]C[Black lost by 5.5 points.])))
