(;GM[1]FF[4]SZ[19]
GN[If White plays 1 here, Black 2 makes the eye at 'a' false.]
PC[http://senseis.xmp.net/?PGBWhyThereIsNoUsefulMoveLeft]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?PGBWhyThereIsNoUsefulMoveLeft

If White plays 1 here, Black 2 makes the eye at 'a' false.]
PL[W]

AB[eg][fg][ch][ih][ai][ci][di][ei][hi][aj][bj][cj][ej][fj][ck][fk][dl][fl][dm][fm][gm][hm][cn][dn][gn][bo][co][do][go][cp][gp][cq][gq][hq][br][dr][fr][hr][bs][cs][ds][es][gs][hs][is]
AW[bg][cg][dg][gg][hg][ah][bh][dh][eh][fh][hh][bi][fi][gi][gj][bk][dk][ek][gk][al][cl][el][gl][hl][il][bm][cm][em][im][bn][en][fn][hn][in][eo][ho][dp][fp][hp][aq][dq][fq][iq][er][ir]
CR[bk][al][cl][bm][cm][bn][aq]
LB[bl:a]

;W[an]C[W1]MN[1]
;B[ak]C[B2]MN[2]

;CR[bk][al][cl][bm][cm][bn][aq]
LB[bl:a]
)
