Why, then, do you think the ...

Why, then, do you think the white player might have done it?" Reynie considered. He imagined himself moving out his knight only to bring it right back to where it started. Why would he ever do such a thing? At last he said,"Perhaps because he doubted himself.
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 Trenton Lee Stewart

Quotes from the same author

I think when I started to write The Mysterious Benedict Society that I had that kind of thing in mind - the notion of having to be able to solve puzzles and riddles because enormous stakes rode upon your ability to do that.
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 Trenton Lee Stewart
No sooner had he thought this than he realized what was anchoring his happiness. It was purpose. He knew what he wanted to do. He knew the way he thought things should be, and Mr. Harinton was proving that other people--even adults--could feel the same way. Nicholas had something to aim for now. He might not know what he wanted to be when he grew up, but he knew with absolute certainty how he wanted to be.
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 Trenton Lee Stewart
You've read half the books in this house? This whole house?" "Well, approximately half." Sticky said. "To be more accurate, I suppose I've read more like" - his eyes went up as he calculated - "three sevenths? Yes, three sevenths." "Only three sevenths?" said Kate, pretending to look disappointed. "And here I was prepared to be impressed.
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 Trenton Lee Stewart
If we're just trying to be accurate, then how about 'The Doomed to Fail Bunch'?" said Constance. "Honestly! We can't even name ourselves.
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 Trenton Lee Stewart
At this, Constance sat down on a rock and covered her face. She seemed smaller than ever now - so small the harbor breeze might catch her up like a scrap of paper and carry her away, carry her into nowhere.
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 Trenton Lee Stewart