This is a very helpful and interesting introduction for chess learners. But as noted in the comments, there are some mistakes in proofreading. JK posted corrections to some games, the Immortal Game and the Chess Check answers 39 and 40. As JK notes, the answer key pages given are not correct in the English printed edition:
Chess Check answer key is on page 167 (not p. 171)
Do you remember the mates key is on P. 167 (not p. 171)
Are you a tactical master key is on p, 169 (not p. 173)
Can you find the mates? key is on p. 168 (not p. 172)
Can you identify the master moves key is on p. 170 (not p. 174)
In addition to the errors in notation given in JK's review, I believe there is a mistake in the second paragraph p. 45, 2nd sentence: "The black king cannot capture the queen because she is protected by the white bishop" (NOT the white knight) There are also mistakes on p. 71 which make reading the descriptions in the second and third paragraph confusing and difficult to relate to the illustrations. I believe in the 2nd paragraph, it should read "black responds by capturing the white bishop (Not the pawn) and the third paragraph is downright confusing! I hope a good chess player will correct it here. See the comment by JK for corrections to the chess check answer key, the immortal game notation and the other errors in notation he (she) gives. Other than these mistakes in the book, the games, chapters and explanations are fun, interesting and very helpful. I hope the publisher will release a revised edition soon!