From the old Ravensburger Game. I don't think it's intended as a problem, but i found it nice.
(;AW[eb]AW[fb]AW[dc]AW[dd]AW[fd]AW[de]AW[ef]AB[ec]AB[fc]AB[ed]AB[ee]C[White to capture 4 stones]PL[W]
(;W[ge];B[gc];W[hc];B[hb]
(;W[ic];B[gd]
(;W[he]C[ Black is deadRIGHT])
(;W[hd]C[ Black is deadRIGHT])
(;W[ie]C[Bad shape (even though you may capture black)])
(;W[gb];B[hd]))
(;W[gb];B[hd])
(;W[gd];B[ic];W[hd];B[gb]C[Black escaped])
(;W[hd];B[gb];W[ib];B[jb]
(;W[ic];B[ia];W[kc]C[ Ok, but not the easiest way to capture black.RIGHT])
(;W[ia];B[ic];W[jc];B[id]
(;W[kb];B[jd]
(;W[kc];B[he])
(;W[ja];B[he]))
(;W[jd];B[ie];W[kb];B[he])))
(;W[ib];B[hd];W[ic];B[gd]C[Black escaped]))
(;W[fe];B[gc]
(;W[hd];B[hc]
(;W[ic];B[ib]C[Of course it's good for White in a real game, but you missed the chance to capture black cleanly.])
(;W[id];B[ic]C[Of course it's good for White in a real game, but you missed the chance to capture black cleanly.]))
(;W[hc];B[gd])
(;W[id];B[hd];W[he];B[ic]C[Of course it's good for White in a real game, but you missed the chance to capture black cleanly.]))
(;W[gc];B[fe]
(;W[gf];B[gd];W[hd];B[ff])
(;W[ge];B[ff])
(;W[ff];B[ge])
(;W[gd];B[ff]))
(;W[hc];B[fe];W[gf];B[hd])
(;W[gd];B[fe])
(;W[hd];B[fe]
(;W[gf];B[ge]
(;W[he];B[ff];W[fg];B[gg])
(;W[hf];B[he];W[ie];B[id]))
(;W[ff];B[ge];W[hf];B[he];W[ie];B[id])))