The repertoire is designed to handle nearly everything an opponent can play:
It is highly recommended for club players (roughly up to 1500–1600 ELO) who are "time-poor" and want to avoid the "theory arms race". Specific Opening Systems Side Stepping Mainline Theory Gerard Welling ...
The book centers on the Old Indian-Hanham Philidor structure for both Black and White. The repertoire is designed to handle nearly everything