Help on Tactic Trainer Puzzle #0123462

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Avatar of joshwood630

Hey, I was working through tactics trainer puzzle #0123462. See attached pictures.

I am trying to understand why it isn't better to Block the queen with the bishop first. Their solution has mate in 4, but my method gives mate in 3

1.Bd5

2. If Rxb6 then Rc1+

2. If Bxd5 then Qxb1+

2. If Qxd5 or any other move then Qxb1+

3. Ne1 is the only move for white then Rxe1#

Please help.

Avatar of joshwood630

Perfect, thanks for your help.