(;GM[1]FF[4]SZ[4]
GN[Two space eyes: a loop]
PC[http://senseis.xmp.net/?AlterIgoEndgame]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?AlterIgoEndgame

Two space eyes: a loop]
PL[B]

AB[ba][da][bb][ac][bc][bd]
AW[aa][ca][cb][cc][dc][cd]

;B[db]C[B3]MN[3]
;W[ab]C[W4]MN[4]

;
)
