I played against extotionist strategy and I guess I got lucky because I'm leading (my score - 1) : (his score - 1) = 2:1 and won't change into 1:3 as advertised because from this step I will always defect.

    25. You defected (1 points) and I defected (1 points)
    24. You defected (1 points) and I defected (1 points)
    23. You defected (1 points) and I defected (1 points)
    22. You defected (1 points) and I defected (1 points)
    21. You defected (1 points) and I defected (1 points)
    20. You defected (1 points) and I defected (1 points)
    19. You defected (1 points) and I defected (1 points)
    18. You defected (1 points) and I defected (1 points)
    17. You defected (1 points) and I defected (1 points)
    16. You defected (1 points) and I defected (1 points)
    15. You defected (1 points) and I defected (1 points)
    14. You defected (1 points) and I defected (1 points)
    13. You defected (1 points) and I defected (1 points)
    12. You defected (1 points) and I defected (1 points)
    11. You cooperated (0 points) and I defected (5 points)
    10. You defected (1 points) and I defected (1 points)
    9. You defected (5 points) and I cooperated (0 points)
    8. You cooperated (3 points) and I cooperated (3 points)
    7. You defected (5 points) and I cooperated (0 points)
    6. You cooperated (0 points) and I defected (5 points)
    5. You defected (1 points) and I defected (1 points)
    4. You defected (5 points) and I cooperated (0 points)
    3. You cooperated (3 points) and I cooperated (3 points)
    2. You defected (5 points) and I cooperated (0 points)
    1. You cooperated (3 points) and I cooperated (3 points)