One user gets illegal moves

[Mercutio1243]

Hi team,

a user got the following illegal chess moves from 1.5.0 version of this package. As you can see in the original excerpt, Stockfish recommends the move "h6h5" for the position "1k1r4/1Pn3p1/4p2p/2b1N3/8/4B2P/4nPP1/1R4K1 w - - 1 30", which is a move for black. However, it is white to move in the position (and white is in check).

The problem with this position/the wrong moves occurred several times for the user.

On my own smartphone using 1.5.0 version of this package and in my desktop version of Stockfish 16.1, Stockfish directly came up with the correct moves (starting with white's correct move "g1f1").

Any idea why this might be happening? Maybe an issue with the phone?

ucinewgame
setoption name Hash value 500
stop
ucinewgame
position fen 1k1r4/1Pn3p1/4p2p/2b1N3/8/4B2P/4nPP1/1R4K1 w - - 1 30
go movetime 500
info depth 18 currmove h6h5 currmovenumber 2
info depth 18 seldepth 27 multipv 1 score cp 231 lowerbound nodes 378297 nps 35203 hashfull 5 tbhits 0 time 10746 pv h6h5
info depth 17 currmove h6h5 currmovenumber 1
info depth 18 seldepth 27 multipv 1 score cp 246 lowerbound nodes 381594 nps 35277 hashfull 5 tbhits 0 time 10817 pv h6h5
info depth 16 currmove h6h5 currmovenumber 1
info depth 18 seldepth 27 multipv 1 score cp 267 lowerbound nodes 384886 nps 35375 hashfull 5 tbhits 0 time 10880 pv h6h5
info depth 15 currmove h6h5 currmovenumber 1
info depth 15 currmove d1f2 currmovenumber 2
info depth 15 currmove d1c3 currmovenumber 3
info depth 15 currmove c5d4 currmovenumber 4
info depth 15 currmove c5d6 currmovenumber 5
info depth 15 currmove h6g5 currmovenumber 6
info depth 15 currmove c5f2 currmovenumber 7
info depth 15 currmove b5d4 currmovenumber 8
info depth 15 currmove b5d6 currmovenumber 9
info depth 15 currmove c5f8 currmovenumber 10
info depth 15 currmove b5c3 currmovenumber 11
info depth 15 currmove d1b2 currmovenumber 12
info depth 15 currmove b5c7 currmovenumber 13
info depth 15 currmove g7g6 currmovenumber 14
info depth 15 currmove b7c7 currmovenumber 15
info depth 15 currmove d1e3 currmovenumber 16
info depth 15 currmove c5e7 currmovenumber 17
info depth 15 currmove b7c8 currmovenumber 18
info depth 15 currmove c5a7 currmovenumber 19
info depth 15 currmove c5b6 currmovenumber 20
info depth 15 currmove b7b8 currmovenumber 21
info depth 15 currmove b7a7 currmovenumber 22
info depth 15 currmove c5a3 currmovenumber 23"
info depth 15 currmove b5a7 currmovenumber 24
info depth 15 currmove b7b6 currmovenumber 25
info depth 15 currmove c5b4 currmovenumber 26
info depth 15 currmove b7a6 currmovenumber 27
info depth 15 currmove b7a8 currmovenumber 28
info depth 15 currmove b5a3 currmovenumber 29
info depth 15 currmove c5e3 currmovenumber 30
info depth 18 seldepth 27 multipv 1 score cp 283 nodes 402069 nps 35468 hashfull 6 tbhits 0 time 11336 pv h6h5 e5d3 b7c6 f4g3 c6d5 d3f4 d5e4 f4e6 c5d4 h3h4 d1c3
info depth 19 currmove h6h5 currmovenumber 1
info depth 19 seldepth 27 multipv 1 score cp 283 nodes 433624 nps 36114 hashfull 6 tbhits 0 time 12007 pv h6h5 e5d3 b7c6 f4g3 c6d5 d3f4 d5e4 f4e6 c5d4 h3h4 d1c3
bestmove h6h5 ponder e5d3

1k1r4/1Pn3p1/4p2p/2b1N3/8/4B2P/4nPP1/1R4K1 w - - 1 30