{"product_id":"100-geometric-games-9780486789569","title":"100 Geometric Games","description":"There are three loops in a tangle of rope. How many are independent, and how many are interlocked?\u003cbr\u003eTwo knights stand on a chessboard. How many other knights must you add so that each square is occupied or threatened by a knight?\u003cbr\u003eAmong six seemingly identical drawings of mandalas, each rotated by multiples of 60 degrees, one is different. Which is it, and why?\u003cbr\u003eChallenge yourself with these mind-benders, brainteasers, and puzzles. Each of them has been carefully selected so that none will be too tough for anyone without a math background ― but they're not \u003ci\u003etoo\u003c\/i\u003e easy. Some are original, and all are clearly and accurately answered at the back of the book.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eAbout the Author\u003c\/b\u003e\u003cbr\u003ePierre Berloquin is a French operations research engineer, writer, and game designer who has written more than 40 books in the area of recreational mathematics.\u003cbr\u003e","brand":"Dover Publications","offers":[{"title":"Default Title","offer_id":50324843954450,"sku":"9780486789569","price":7.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0831\/4771\/8930\/files\/img_41eb2b83-800a-467a-8e6a-fd7a715d9f3f.jpg?v=1727676287","url":"https:\/\/surprise-castle.myshopify.com\/products\/100-geometric-games-9780486789569","provider":"Surprise Castle","version":"1.0","type":"link"}