Struct shakmaty_syzygy::Dtz

pub struct Dtz(pub i32);

Distance to zeroing of the half-move clock.

Zeroing the half-move clock while keeping the game theoretical result in hand guarantees making progress.

Can be off by one: Dtz(-n) can mean a loss in n + 1 plies and Dtz(n) can mean a win in n + 1 plies. This is guaranteed not to happen for positions exactly on the edge of the 50-move rule, so that (with some care) this never impacts results of practical play.

DTZ	WDL
-100 <= n <= -1	Loss	Unconditional loss (assuming the 50-move counter is zero). Zeroing move can be forced in -n plies.
n < -100	Blessed loss	Loss, but draw under the 50-move rule. A zeroing move can be forced in -n plies or -n - 100 plies (if a later phase is responsible for the blessing).
0	Draw
100 < n	Cursed win	Win, but draw under the 50-move rule. A zeroing move can be forced in n or n - 100 plies (if a later phase is responsible for the curse).
1 <= n <= 100	Win	Unconditional win (assuming the 50-move counter is zero). Zeroing move can be forced in n plies.

Methods

impl Dtz

pub fn before_zeroing(wdl: Wdl) -> Dtz

Converts wdl to a DTZ, given that the best move is zeroing.

WDL	DTZ
Loss	-1
Blessed loss	-101
Draw	0
Cursed win	101
Win	1

pub fn add_plies(&self, plies: i32) -> Dtz

Increases the absolute value by plies.

Trait Implementations

impl Debug for Dtz

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Copy for Dtz

impl Clone for Dtz

fn clone(&self) -> Dtz

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Eq for Dtz

impl PartialEq for Dtz

fn eq(&self, other: &Dtz) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Dtz) -> bool

This method tests for !=.

impl Ord for Dtz

fn cmp(&self, other: &Dtz) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

impl PartialOrd for Dtz

fn partial_cmp(&self, other: &Dtz) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Dtz) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Dtz) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Dtz) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Dtz) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl From<Dtz> for i32

fn from(wdl: Dtz) -> i32

Performs the conversion.

impl From<Dtz> for i64

fn from(wdl: Dtz) -> i64

Performs the conversion.

impl From<Dtz> for i128

fn from(wdl: Dtz) -> i128

Performs the conversion.

impl From<u8> for Dtz

fn from(dtz: u8) -> Dtz

Performs the conversion.

impl From<i8> for Dtz

fn from(dtz: i8) -> Dtz

Performs the conversion.

impl From<u16> for Dtz

fn from(dtz: u16) -> Dtz

Performs the conversion.

impl From<i16> for Dtz

fn from(dtz: i16) -> Dtz

Performs the conversion.

impl From<i32> for Dtz

fn from(dtz: i32) -> Dtz

Performs the conversion.

impl Neg for Dtz

type Output = Dtz

The resulting type after applying the - operator.

fn neg(self) -> Dtz

Performs the unary - operation.

impl Add for Dtz

type Output = Dtz

The resulting type after applying the + operator.

fn add(self, other: Dtz) -> Dtz

Performs the + operation.

impl AddAssign for Dtz

fn add_assign(&mut self, other: Dtz)

Performs the += operation.

impl Sub for Dtz

type Output = Dtz

The resulting type after applying the - operator.

fn sub(self, other: Dtz) -> Dtz

Performs the - operation.

impl SubAssign for Dtz

fn sub_assign(&mut self, other: Dtz)

Performs the -= operation.