Sentence:  I screamed out a concession and the kids, disgruntled, wandered back to their own games. Then I asked to watch Marty play Brian. During this match, too, Marty <WSD>mismoved</WSD> the kings. Brian didn't seem to notice. I sent them both to the nurse. 
Meaning of the word marked with <WSD> tags:  To move wrongly, incorrectly, or in error.