Tactic 0054

[Event "ICC Blitz"]
[White "CruiseMissile"]
[Black "jbennett"]
[Result "*"]
[Annotator "JB"]
[SetUp "1"]
[FEN "7k/p7/7p/1N2b3/5p2/PP6/4r2P/5R1K b - - 0 39"]

{Black to move, white just played a3. }
{Second best is a5 (-0.57), best is a6 (-2.55) }
1... a6 {The knight isn't quite trapped, but it is forced }
{to the edge of the board. }
2. Na7 Rc2
3. b4 Rc7 {And now it is trapped. }
4. Re1 f3
5. Rf1 {If Rxe5, then Rc1+ leads to mate. }
5... Rxa7
*