This brief new book by Feng Yun contains two extensive game reviews, exploring alternative lines of play in over 80 diagrams. The games are between anonymous amateurs who are about AGA 4 dans. As such, the book is probably most useful for players that strong or a bit weaker. Both games end by resignation after a large loss in the middle game. Consequently, the book covers the opening and middle game fighting, but does not discuss even the large end game.

Weaker players will derive value from Ms. Yun's overt comments, as well as from her implicit points, as well. For example, the players do largely follow the natural flow of their games. While they overlook important plays that Ms. Yun points out, these games still have few of the pointless "pass" moves common in kyu-level games.

Of course, the overt lessons are best developed. Ms. Yun shows very good examples of playing urgent points before big ones. She also shows examples of how to best exploit an opponent's weaknesses. The challenge to readers is to apply these lessons in their own games.

Physically, the book is short, around 50 pages of text, and well made. There are several unfortunate editing errors, though - most strikingly, a diagram (on page 19) is not mentioned. While it appears to show a good line for Black, this should clearly have been explained in the book.

Overall, the book is an interesting alternative to the commented games available on-line. Its low price and number of alternative lines are attractive, while its 4 dan level and lack of end game analysis limit it. Ideally, many more such volumes will be published, so a player could match the analyses to their own strength