As another reviewer wrote, these are not real game type positions. If you want that, try 303 Tricky Checkmates by these same authors. However, these positions are very helpful for making the student look carefully. The first 100 problems are checkmates in 1, but these are not your typical mate in 1 problems. They are hard, because when you move a piece, you end up blocking or unblocking another. Sometimes you cannot make the move that seems to mate because of a pin. These are things that beginner level players often overlook and that makes this book good training material.