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 *