Great app but 2 requests

This app is great but neglects the defensive side of chess. I would love to see 4 play modules added. Some with simple defense problems where a piece is threatened, and others with advanced threat problems, that address not just threat of mate, but more complex loss of material as well. This is a great app as is, but would be the best available if it addressed the defensive side of chess with about 600 defense puzzles.

Gampapa3 about Chess Trainer