my ($from_row, $from_col, $to_row, $to_col, $promo) = $pos->parse_pretty_move($moves->[$i]);
my $next_move = $moves->[$i];
my $bpfen = $pos->bitpacked_fen;
my ($from_row, $from_col, $to_row, $to_col, $promo) = $pos->parse_pretty_move($moves->[$i]);
my $next_move = $moves->[$i];
my $bpfen = $pos->bitpacked_fen;