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use crate::eval::tables::PositionTables; use crate::eval::values::PieceValues; use myopic_board::{ChessBoard, Move, Piece, Square}; use serde_derive::{Deserialize, Serialize}; pub mod additional_components; #[cfg(test)] mod clearcut; pub mod imp; mod material; pub mod tables; pub mod values; /// The evaluation upper/lower bound definition pub const INFTY: i32 = 500_000i32; /// The evaluation assigned to a won position. pub const WIN_VALUE: i32 = INFTY - 1; /// The evaluation assigned to a lost position. pub const LOSS_VALUE: i32 = -WIN_VALUE; /// The evaluation assigned to a drawn position. pub const DRAW_VALUE: i32 = 0; /// Extension of the Board trait which adds a static evaluation function. pub trait EvalChessBoard: ChessBoard { /// The static evaluation function assigns a score to this exact /// position at the point of time it is called. It does not take /// into account potential captures/recaptures etc. It must follow /// the rule that 'a higher score is best for the active side'. That /// is if it is white to move next then a high positive score indicates /// a favorable position for white and if it is black to move a high /// positive score indicates a favorable position for black. If the /// state it terminal it must return the LOSS_VALUE or DRAW_VALUE /// depending on the type of termination. fn static_eval(&mut self) -> i32; /// The value each piece is considered to have in the current /// state of the game. fn piece_values(&self) -> &[i32; 6]; /// The positional (table) value of the given piece situated at the /// given square in the context of this position. fn positional_eval(&self, piece: Piece, location: Square) -> i32; } pub trait EvalComponent: Clone + Send { fn static_eval(&self) -> i32; fn make(&mut self, mv: &Move); fn unmake(&mut self, mv: &Move); } /// Allows one to configure the parameters of the evaluation board. #[derive(Debug, Clone, Serialize, Deserialize, PartialOrd, PartialEq, Eq, Default)] pub struct MaterialParameters { pub piece_values: PieceValues, pub position_tables: PositionTables, }