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You write PxP e. p. in the old descriptive notation. But in the modern algebraic notation (see game below) no 'e. p.' is added. On move 12 the White Pawn on c4 captured the Black Pawn on d5 and then a Black Pawn moved from c7 to c5. On move 13 the White Pawn, now on d5, captured that Black Pawn en passant, by moving it back to c6 and then taking it. The brief notation '13. dxc6' is all that is required to describe the move. To answer Gabe's question, this game shows that there are no special restrictions on en passant capture. And to answer david's question, any Pawn capture is a diagonal move which cannot be affected by a piece orthogonally in front of the attacking Pawn. Unless some other rule happened to apply, such as the case when that piece pins the Pawn against its own King. <p>Tigran Petrosian - Mikhail Botvinnik, <p>13th game of the World Championship Match (Moscow 1963) <p>1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Be7 6. O-O O-O 7. Nc3 Ne4 8. Nxe4 Bxe4 9. d5 Bf6 10. Ne1 Bxg2 11. Nxg2 exd5 12. cxd5 c5 13. dxc6 dxc6 14. Qc2 c5 15. Rd1 Qe8 16. Bf4 Nc6 17. Bd6 Be7 18. e3 Rd8 19. Bxe7 Qxe7 20. Nf4 g6 21. Qa4 Ne5 22. Rxd8 Rxd8 23. Rd1 c4 24. e4 b5 25. Rxd8+ Qxd8 26. Qxb5 Qd1+ 27. Kg2 Qf3+ 28. Kg1 Qd1+ 29. Kg2 Qf3+ 30. Kg1 Qxe4 31. Qd5 Qxd5 32. Nxd5 Nd3 33. b4 cxb3 34. axb3 f5 35. b4 Kf7 36. b5 Ne5 37. b6 a5 38. Kf1 Ke6 39. b7 Nc6 40. Nc7+ Kd6 41. Na6 a4 42. Ke2 a3 43. Nb4 Nb8 44. Kd3 Kc7 45. Kc2 Kxb7 46. Kb3 Kb6 47. Kxa3 Kc5 48. Kb3 Kd4 49. Kc2 Ke4 50. Kd2 Kf3 51. Ke1 Kg2 52. h4 Kf3 53. Nd3 Nd7 54. Kf1 1/2-1/2