Game Phases
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The textbook division of game phases enumerates three of them:
In the opening, the focus is on development, in the middlegame - on attack and defense, in the endgame - on pawn promotion and realization of the material advantage.
Whereas this definition is good enough for humans, coding it in a straightforward manner would introduce evaluation discontinuity in many places. For that reason many programs define several game phases, based on the amount of material on the board.
See also
Forum Posts
2015 ...
- From midgame to endgame: help needed by Stephane Nicolet, FishCooking, September 17, 2015 » Stockfish
- Anomaly of Stockfish eval depending on phases of the game by Kai Laskos, CCC, May 05, 2016
- is phase a good indicator of game progress? by Alexandru Mosoi, June 23, 2016 » Tapered Eval
- Early / middle / end game transitions? by notachessplayer, OpenChess Forum, February 19, 2017
- A different approach: how to avoid endgames with slight advantage - insufficient to win by ig.u...@gmail.com, FishCooking, October 22, 2017
- mg vs eg eval by Joost VandeVondele, FishCooking, October 06, 2019 » Middlegame, Endgame, Stockfish
2020 ...
- [NNUE and game phase by Dann Corbit, CCC, January 18, 2021