你好，move = info.get("pv")[0]，皮卡鱼引擎，第二步或者第三步就 IndexError: list index out of range

[startnow2024]

@shinoi2
你好，我前两天问过引擎的问题的，当时是没把nnue文件放在同一个文件夹。
今天准备做一个中国象棋的简单GUI，又报错了，只输出了一步正确的走子。代码如下:

import cchess
import cchess.engine

engine = cchess.engine.SimpleEngine.popen_uci("D:/Windows/pikafish-bmi2.exe")
board = cchess.Board()

for i in range(5):
    info = engine.analyse(board, cchess.engine.Limit(time=1))
    print(info)
    move = info.get("pv")[0]
    print(move)
    board.push(move)

输出的info如下：

{'string': 'NNUE evaluation using pikafish.nnue (52MiB, (25920, 1024, 15, 32, 1))', 'depth': 21, 'seldepth': 33, 'multipv': 1, 'score': PovScore(Cp(+25), RED), 'nodes': 993943, 'nps': 992950, 'hashfull': 423, 'tbhits': 0, 'time': 1.001, 'pv': [Move.from_uci('h2e2')], 'upperbound': True}
h2e2
{'string': 'NNUE evaluation using pikafish.nnue (52MiB, (25920, 1024, 15, 32, 1))', 'depth': 22, 'seldepth': 33, 'multipv': 1, 'score': PovScore(Cp(-27), BLACK), 'nodes': 1016818, 'nps': 1015802, 'hashfull': 395, 'tbhits': 0, 'time': 1.001, 'pv': []}
Traceback (most recent call last):
  File "D:\xiangqi\xiangqi.py", line 10, in <module>
    move = info.get("pv")[0]
           
IndexError: list index out of range

第一步正常，第二步就报错了。试了几次，有时是第三步报错。
谢谢

[startnow2024]

这个报错与board.push(move)无关。我直接设置一个FEN，然后皮卡鱼就没给出move了。在ubuntu上也试了一下，同样的报错。只有初始位置的FEN，皮卡鱼才返回move（h2e2）. 其他的FEN试了好几个，都报错。直接print info 就能看出问题来。

import cchess
import cchess.engine

engine = cchess.engine.SimpleEngine.popen_uci("D:/software/chess AI/pikafish/Pikafish.2024-08-31/Windows/pikafish-bmi2.exe")
board = cchess.Board()
board_fen='rnbakabnr/9/1c5c1/p1p1p1p1p/9/9/P1P1P1P1P/1C2C4/9/RNBAKABNR b - - 1 1'
board.set_fen(board_fen)
print(board.fen())
info = engine.analyse(board, cchess.engine.Limit(time=1))
print(info)

输出如下：

rnbakabnr/9/1c5c1/p1p1p1p1p/9/9/P1P1P1P1P/1C2C4/9/RNBAKABNR b - - 1 1
{'string': 'NNUE evaluation using pikafish.nnue (52MiB, (25920, 1024, 15, 32, 1))', 'depth': 23, 'seldepth': 31, 'multipv': 1, 'score': PovScore(Cp(-26), BLACK), 'nodes': 974194, 'nps': 973220, 'hashfull': 394, 'tbhits': 0, 'time': 1.001, 'pv': []}

'pv': []，最后一项是空的