Guessed right!

!g.9P]U}\XB#`#/Bh5g@({)!`^q?>mq:.Yn1am:HnZJoSYk~6_?i\6cJWTBW:rHHhNm~Sd
{]KzR9:xBn@IOAYSB~g2T6`d7(fqu*H
KRef Version 2006-06-20
53,54
Not possible
Legal Move
Black loses - checkmate!
End of Log