scan.py

for index, fen in enumerate(fens):
    time.sleep(50/1000) # Magic!

    engine.isready()
    engine.ucinewgame()

    board = chess.Board(fen)

    engine.isready()
    engine.position(board) #copy.deepcopy(board) also tried

    # UCI 'isready' followed by 'go' command
    pv,score = getScore(engine, checkTime);