Trueskill

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Released on Mar 6 2013.

Changed to raise :exc:`FloatingPointError` instead of :exc:`ValueError` (math
domain error) for a problem similar to `issue 5`_ but with more extreme input.

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Released on Mar 5 2013.

:class:`TrueSkill` got a new option ``backend`` to choose cdf, pdf, ppf
implementation.

When winners have too lower rating than losers, :meth:`TrueSkill.rate` will
raise :exc:`FloatingPointError` if the backend is ``None`` or "scipy". But
from this version, you can avoid the problem with "mpmath" backend. This was
reported at `issue 5`_.

.. _issue 5: https://github.com/sublee/trueskill/issues/5

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Released on Dec 6 2012.

Fixed a printing bug on :meth:`TrueSkill.quality`.

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Released on Nov 30 2012.

- Added "Partial play" implementation.
- Worked well in many Python versions, 2.5, 2.6, 2.7, 3.1, 3.2, 3.3 and many
interpreters, CPython, `Jython`_, `PyPy`_.
- Supported that using dictionaries as a ``rating_group`` to choose specific
player's rating simply.
- Added shorcut functions for 2 players individual match, the most usage:
:func:`rate_1vs1` and :func:`quality_1vs1`,
- Renamed :meth:`TrueSkill.transform_ratings` to :meth:`TrueSkill.rate`.
- Renamed :meth:`TrueSkill.match_quality` to :meth:`TrueSkill.quality`.

.. _Jython: http://jython.org/
.. _PyPy: http://pypy.org/

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Released on Oct 5 2012.

Fixed :exc:`ZeroDivisionError` issue. For more detail, see `issue3`_. Thanks
to `Yunwon Jeong`_ and `Nikos Kokolakis`_.

.. _issue3: https://github.com/sublee/trueskill/issues/3
.. _Yunwon Jeong: https://github.com/youknowone
.. _Nikos Kokolakis: https://github.com/konikos

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Released on Mar 10 2012.

Improved the match quality performance.