Struct shakmaty_syzygy::Dtz

pub struct Dtz(pub i32);

DTZ₅₀′′. Based on the distance to zeroing of the half-move clock.

Zeroing the half-move clock while keeping the game theoretical result in hand guarantees making progress, so min-maxing Dtz values guarantees achieving the optimal outcome under the 50-move rule.

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.

Tuple Fields

0: i32

Implementations

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: u32) -> Dtz

Increases the absolute non-zero value by plies.

Panics

Panics if overflow occurrs.

Examples

use shakmaty_syzygy::Dtz;

assert_eq!(Dtz(1).add_plies(3), Dtz(4));
assert_eq!(Dtz(0).add_plies(3), Dtz(0));
assert_eq!(Dtz(-1).add_plies(3), Dtz(-4));

pub fn add_plies_checked(self, plies: u32) -> Option<Dtz>

Increases the absolute non-zero value by plies, returning None if overflow occurred.

pub fn add_plies_saturating(self, plies: u32) -> Dtz

Increases the absolute non-zero value by plies, saturating if overflow occurred.

pub fn signum(self) -> i32

Returns a number representing the sign of self.

• 1 if self > Dtz(0)
• 0 if self == Dtz(0)
• -1 if self < Dtz(0)

pub fn is_zero(self) -> bool

Returns self == Dtz(0).

pub fn is_positive(self) -> bool

Returns self > Dtz(0).

pub fn is_negative(self) -> bool

Returns self < Dtz(0).

Trait Implementations

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 Debug for Dtz

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

Formats the value using the given formatter.

impl From<Dtz> for i128

fn from(wdl: Dtz) -> i128

Converts to this type from the input type.

impl From<Dtz> for i32

fn from(wdl: Dtz) -> i32

Converts to this type from the input type.

impl From<Dtz> for i64

fn from(wdl: Dtz) -> i64

Converts to this type from the input type.

impl From<i16> for Dtz

fn from(dtz: i16) -> Dtz

Converts to this type from the input type.

impl From<i32> for Dtz

fn from(dtz: i32) -> Dtz

Converts to this type from the input type.

impl From<i8> for Dtz

fn from(dtz: i8) -> Dtz

Converts to this type from the input type.

impl From<u16> for Dtz

fn from(dtz: u16) -> Dtz

Converts to this type from the input type.

impl From<u8> for Dtz

fn from(dtz: u8) -> Dtz

Converts to this type from the input type.

impl Neg for Dtz

type Output = Dtz

The resulting type after applying the - operator.

fn neg(self) -> Dtz

Performs the unary - operation.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

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: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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: &Rhs) -> bool

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

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

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

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

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

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

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

impl Copy for Dtz

impl Eq for Dtz

impl StructuralPartialEq for Dtz