chess theory

Chess theory encompasses the strategic and tactical principles that guide play across the game's three phases: the opening, middlegame, and endgame. Early theory, exemplified by Gioacchino Greco, focused on tactics and material gain. Fran\u00e7ois-Andr\u00e9 Philidor revolutionized chess thinking in the 18th century by emphasizing strategy, planning, and the crucial role of pawns, famously stating they are "the very life of the game." Later developments, particularly from Soviet players and pragmatists like Bobby Fischer and Anatoly Karpov, introduced a more competitive approach, prioritizing unbalancing positions and recognizing that games are often decided by mistakes made under time pressure. Modern theory also includes positional analysis, strategy, and endgame technique.12