(;GM[1]FF[4]SZ[16:19]
GN[Difference game 4, Black first]
PC[http://senseis.xmp.net/?PracticalEndgameTest5/DifferenceGames]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?PracticalEndgameTest5/DifferenceGames

Difference game 4, Black first]
PL[B]

AB[ba][na][pa][bb][lb][mb][nb][pb][bc][lc][nc][ad][bd][fd][ld][nd][be][ce][fe][me][bf][ef][mf][nf][bg][eg][bh][eh][mh][nh][bi][di][li][ni][bj][dj][lj][lk][mk]
AW[aa][ca][ab][cb][db][eb][ob][cc][ec][oc][cd][ed][kd][od][pd][de][ke][ne][oe][cf][df][lf][of][lg][og][ch][dh][lh][oh][ci][ei][mi][oi][ej][mj][nj][oj][dk][ek]

;B[oa]C[B1]MN[1]
;W[le]C[W2]MN[2]
;B[md]C[B3]MN[3]
;W[cj]C[W4]MN[4]

;
)
