(;GM[1]FF[4]SZ[19]
GN[In practice]
PC[https://senseis.xmp.net/?TsumegoFromGames51/Solution]AP[GoWiki:2009]
DT[2022-12-15]
C[Diagram from https://senseis.xmp.net/?TsumegoFromGames51/Solution

In practice]
PL[B]

AB[bb][bc][cc][cd][dd][de][ef][cg][dg][eg][di][dj][ck][dk]
AW[bd][be][cf][df][bg][ch][ci][cj]

;B[bj]C[B1]MN[1]
;W[bi]C[W2]MN[2]
;B[bk]C[B3]MN[3]
;W[ai]C[W4]MN[4]

;
)
