Tactic 0125

[Event "ICC Blitz"]
[White "nityanand"]
[Black "jbennett"]
[Result "*"]
[Annotator "JB"]
[SetUp "1"]
[FEN "r1bqk2r/p2p1ppp/1pn5/2bQP3/8/2P2N2/PP3PPP/RNB1K2R w KQkq - 0 10"]

{White to move, black just played b6. }
{Second best is O-O (1.78), best is b4 (3.06) }
1. b4 Be7
2. b5 {The old double pawn push trick, attacking the pinned knight. }
2... Bb7
3. bxc6 dxc6
4. Qe4
*