D. A. Klarner, “Mathematical Recreations”
English | ISBN: 0486400891 | 1998 | 382 pages | Djvu | 6 MB
Twopins is considered an impartial game because in any position, the available options are the same for each of the two players. In contrast, chess is a partisan game because, in any position, Black has a different set of available options from White. The theory of impartial games in which the last player is declared the winner, is not as widely known as it deserves to be.