Semipositional

Semipositional refers to a class of games, often abstract strategy games, that share characteristics of both positional and combinatorial games. In combinatorial games, the available moves depend solely on the current state of the game, and there are no chance elements or hidden information. Positional games, on the other hand, are often characterized by the creation of territory or the strategic placement of pieces to control key areas of the board.

Semipositional games typically involve players making moves that alter the game state, similar to combinatorial games. However, the long-term consequences of these moves might relate to controlling or claiming parts of the game space, echoing aspects of positional play. The distinction can sometimes be subtle, with many games exhibiting traits of both categories. For instance, in some semipositional games, a player might make a move that directly attacks an opponent's piece (combinatorial aspect), but that move also serves to strengthen their control over a particular area of the board (positional aspect).

The analysis of semipositional games can be complex, as it often requires understanding both immediate tactical opportunities and broader strategic implications regarding board control. This makes them a rich area of study in game theory and a source of engaging gameplay in various strategy board games. Examples might include certain variants of chess or Go, where tactical exchanges are intertwined with the establishment of territorial advantage.