distance.py

def calculate_distance(start: Node, end: Node, starts: Set[int]):
    turns = 0
    position = start.end
    while position < end.start:
        delta = None
        for delta in range(6, 0, -1):
            pos = position + delta
            if pos not in starts or pos == end.start:
                break
        else:
            return
        turns += 1
        position += delta
    start.edges.append(Edge(turns, end))