The theory introduced in the 1960s of partizan games extended the impartial theory, by relaxing the condition that a play available to one player be available to both. It was pioneered by the authors Berlekamp, Conway and Guy ofWinning Ways for your Mathematical Plays, published after quite some delay in book form. Some of the inspiration (for the use in particular of disjoint sums of games) was based on observations of Conway of the play in Go endgames. His book On Numbers and Games introducing a general conception of *number* was published ahead of *Winning Ways*, though based in part on the same collaboration.

*This article is a stub. You can help Wikipedia by fixing it.*