def is$\_$check$($side: bool, B: Board$)->$ bool:

$\text{'}\text{'}\text{'}$

checks if configuration of B is check for side

Hint: use can$\_$reach

$\text{'}\text{'}\text{'}$

def is$\_$checkmate$($side: bool, B: Board$)->$ bool:

$\text{'}\text{'}\text{'}$

checks if configuration of B is checkmate for side

Hints:

$-$ use is$\_$check

$-$ use can$\_$reach

$\text{'}\text{'}\text{'}$

def is$\_$stalemate$($side: bool, B: Board$)->$ bool:

$\text{'}\text{'}\text{'}$

checks if configuration of B is stalemate for side

Hints:

$-$ use is$\_$check

$-$ use can$\_$move$\_$to

$\text{'}\text{'}\text{'}$

def read$\_$board$($filename: str$)->$ Board:

$\text{'}\text{'}\text{'}$

reads board configuration from file in current directory in plain format

raises IOError exception if file is not valid $($see section Plain board configurations$)$

$\text{'}\text{'}\text{'}$

def save$\_$board$($filename: str$,$ B: Board$)->$ None:

$\text{'}\text{'}\text{'}$saves board configuration into file in current directory in plain format'$\text{'}\text{'}$

def find$\_$black$\_$move$($B: Board$)->$ tuple$[$Piece$,$ int, int$]$:

$\text{'}\text{'}\text{'}$

returns $($P$,$ x$,$ y$)$ where a Black piece P can move on B to coordinates x$,$y according to chess rules

assumes there is at least one black piece that can move somewhere

Hints:

$-$ use methods of random library

$-$ use can$\_$move$\_$to

$\text{'}\text{'}\text{'}$

def conf$2$unicode$($B: Board$)->$ str:

$\text{'}\text{'}\text{'}$converts board cofiguration B to unicode format string $($see section Unicode board configurations$)\text{'}\text{'}\text{'}$

def main$()->$ None:

$\text{'}\text{'}\text{'}$

runs the play

Hint: implementation of this could start as follows:

filename $=$ input$("$File name for initial configuration: $")$

$...$

$\text{'}\text{'}\text{'}$

if $\_\_$name$\_\_==\text{'}\_\_$main$\_\_\text{'}$: #keep this in

main$()$