Cannot replay legal moves

[vhf]

Hi,

Nice library you got there, I really like its ease of use. Unfortunately I'm having trouble with the push_san() function. Here is a sample of code :

from __future__ import print_function
import chess

board = chess.Bitboard("k7/pp6/8/8/8/8/8/3R3K w - - 0 1")

for move in board.legal_moves:
    pprint(move)
    try:
        board.push_san(str(move))
        board.fen()
        board.pop()
    except:
        print('Bad move')

For each legal move, it says "Bad move".

[niklasf]

Hi,

this is because board.push_san() strictly expects standard algebraic notation like 'Nf6' or 'e4' or 'O-O'. Standard algebraic notation depends on the position, for example a move like 'Re1' might sometimes have to be qualified with 'Rfe1'.

str(move) or move.uci() gets the move in position independent UCI notation, like 'g8f6' 'e2e4' or 'e1g1'.

What to do instead?

• If you already have a move object you can board.push(move).
• If you have a string uci in UCI notation you can board.push(Move.from_uci(uci)). Note that Move.from_uci() is able to get you a move object independent of the position.

Best regards Niklas

[vhf]

Hi,

Many thanks for your answer. I'll close this issue.

Best -vhf