get status by $chess->inStalemate()
example:
<?php
use \Ryanhs\Chess\Chess;
$chess = new Chess();
// fen source: https://www.redhotpawn.com/forum/only-chess/interesting-stalemate-position.152109
// start fen : 3b3k/p6p/1p5P/3q4/8/n7/PP6/K4Q2 w - - 0 1
$chess->load('7k/p6p/1p3b1P/3q4/8/n7/PP6/K7 w - - 0 2');
var_dump($chess->inStalemate()); // return TRUEboard:
+------------------------+
8 | . . . . . . . k |
7 | p . . . . . . p |
6 | . p . . . b . P |
5 | . . . q . . . . |
4 | . . . . . . . . |
3 | n . . . . . . . |
2 | P P . . . . . . |
1 | K . . . . . . . |
+------------------------+
a b c d e f g h