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Maintaining a PIN is a full-time job. A piece cannot simultaneously maintain a PIN -and- also DEFEND against some other threat. If a line piece meets a threat by pinning, then it must stay on the line of the pin to maintain the pin and cannot perform any other function (attack or defense). A great example of exploiting a pinning defender by <DEFLECTION> comes from the game Lagno vs M Etmans, 2004. Here it is White to make her 60th move. 
click for larger viewSince the Black b2-queen must stay on the 2nd rank to pin the White g2-pawn to the White h2-king in order to stop g2-g3#, the Black queen cannot also defend the d4-square. White plays 60 ♖d4+!, mating, since 60 ... ♕xd4 <DEFLECTS> the Black queen from her pinning task and allows 61 g3#. Another great example, from the game Gashimov v Skripchenko, Dubai Open 2003: 
click for larger viewHere Black's last move, 40 ... ♗c3??, is a blunder because the Black c6-queen is now <OVERWORKED>. The Black queen meets the threat of ♖g2xg8# by maintaining a <PIN> on the White g2-rook to the White h1-king along the a8-h1 diagonal. The Black queen can therefore not also <DEFEND> the Black c3-bishop, because the Black queen can no longer meet the mating threat to the g8-square from the c3-square. White wins immediately with 41 ♕x♗c3+!.
Maintaining a <PIN> is a full-time job. You cannot maintain a <PIN> and <DEFEND>. Event "Dubai open"
Site ""
Date "2003.??.??"
Round "2"
White "Gashimov, Vugar"
Black "Skripchenko, Almira"
Result "1-0"
WhiteElo "2579"
BlackElo "2501"
NIC "SI 38.16"
ECO "B33"
PlyCount "81"
1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 d6 7. Bf4 e5
8. Bg5 a6 9. Na3 b5 10. Bxf6 gxf6 11. Nd5 Bg7 12. c3 f5 13. exf5 Bxf5 14.
Nc2 O-O 15. Nce3 Be6 16. Bd3 f5 17. O-O Ra7 18. f4 Raf7 19. Kh1 Qb8 20. Bc2
b4 21. Ba4 Ne7 22. Nxb4 a5 23. Nc6 Nxc6 24. Bxc6 exf4 25. Nd5 Qxb2 26. Qa4
f3 27. gxf3 Kh8 28. Rab1 Qd2 29. Rbd1 Qb2 30. Rg1 Bxd5 31. Bxd5 Re7 32. Qh4
Rfe8 33. Rb1 Qe2 34. Bc6 Qe3 35. Bxe8 Qxf3+ 36. Rg2 Rxe8 37. Qg5 Qxc3 38.
Rbg1 Rg8 39. Qxf5 Qc6 40. Qxa5 Bc3 41. Qxc3+
1-0
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Kibitzing
