I need some help with this puzzle

Sort:
Avatar of catechine
In this puzzle I to play e5 attacking the knight. In the puzzle after an exchange of bishops black does not run away with the knight, but allows it's capture? Why? Could someone elucidate me please? [Site "Chess.com"] [Result "*"] [SetUp "1"] [FEN "rn1qkb1r/pp2pppp/2p2nb1/8/3PP3/2NB1N2/PP3PPP/R1BQ1RK1 b kq - 0 1"] 1... Nbd7 2. e5 (2. Qb3) 2... Bxd3 (2... Ng4 3. Bxg6 hxg6 4. e6 fxe6) 3. Qxd3 e6 (3... Ng8) (3... Nh5) (3... Ng4) (3... Nd5) 4. exf6 *
Avatar of catechine

[Site "Chess.com"] [Result "*"] [SetUp "1"] [FEN "rn1qkb1r/pp2pppp/2p2nb1/8/3PP3/2NB1N2/PP3PPP/R1BQ1RK1 b kq - 1 8"] 8... Nbd7 9. e5 Bxd3 10. Qxd3 e6 11. exf6 *