IllegalMoveException on legal move about cm-pgn

[shaack]

OK, I got it, it is described in the documentation of chess.js, under .move(move, [ options ]) about the sloppy flag, is written:

// correctly parses incorrectly disambiguated moves
chess = new Chess(
    'r2qkbnr/ppp2ppp/2n5/1B2pQ2/4P3/8/PPP2PPP/RNB1K2R b KQkq - 3 7'
)

chess.move('Nge7') // Ne7 is unambiguous because the knight on c6 is pinned
// -> null

chess.move('Nge7', { sloppy: true })
// -> { color: 'b', from: 'g8', to: 'e7', flags: 'n', piece: 'n', san: 'Ne7' }

So move Nge2 is wrong because it is unambiguous, correct would be "Ne2".

But I have adjusted something, I have now also included the "sloppy" flag in the constructor of Pgn, so now it works if you use new Pgn(sloppyPgn, {sloppy: true}).

[shaack]

Yes, thanks for reporting. This looks like a problem of chess.js, because, when I initialize chess.js with this fen:
r1bqk2r/pppp1ppp/2n2n2/4p3/1bB1P3/2NP4/PPP2PPP/R1BQK1NR w KQkq - 1 5

chess.js returns "null", when moving "Nge2":

<script src="https://cdnjs.cloudflare.com/ajax/libs/chess.js/0.10.3/chess.min.js"></script>
<script>
    let chess = new Chess("r1bqk2r/pppp1ppp/2n2n2/4p3/1bB1P3/2NP4/PPP2PPP/R1BQK1NR w KQkq - 1 5")
    let result = chess.move("Nge2")
    console.log(result) // is null
</script>

What do you think, did we both miss something or is it a failure in chess.js?

[joshrouwhorst]

That worked for me! Thanks!