▁is ▁considered ▁uns ound ▁but ▁must ▁be ▁handled ▁carefully . ▁ 5 . N xe 4 ▁d 5 ▁pos es ▁no ▁problems ▁for ▁Black . ▁If ▁ 5 . N xf 7 ? ▁Q h 4 ! ▁ 6 . g 3 ▁( 6 . 0 - 0 ▁B c 5 !) ▁ 6 ... Q h 3 ▁ 7 . N x h 8 ▁Q g 2 ▁ 8 . R f 1 ▁N d 4 ▁ 9 . Q h 5 + ▁g 6 ▁ 1 0 . N x g 6 ▁h x g 6 ▁ 1 1 . Q x g 6 + ▁K d 8 ▁and ▁Black ▁has ▁dangerous ▁thre ats . ▁( Al tern atively , ▁after ▁ 5 . N xf 7 ? ▁Q h 4 ! ▁ 6 . g 3 , ▁Black ▁could ▁play ▁more ▁ag gress ively ▁ 6 ... N x g 3 ! ▁ 7 . fx g 3 ▁Q e 4 + ▁ 8 . Q e 2 ▁Q x h 1 + ▁ 9 . Q f 1 ▁Q xf 1 + ▁ 1 0 . K xf 1 ▁d 5 ▁ 1 1 . B x d 5 ▁Bh 3 + ▁ 1 2 . Ke 1 ▁N b 4 ▁ 1 3 . B b 3 ▁N xc 2 + ▁ 1 4 . B xc 2 ▁K xf 7 ▁with ▁a ▁distinct ▁advantage ▁of ▁material ▁for ▁Black .) ▁ ▁Correct ▁is ▁ 5 . B xf