After opening both bishop diagonals (1. P-76 P-34), White has not revealed to Black what their strategy will be. If Black wishes to play a Ranging Rook opening (like Fourth File Rook), Black may only choose a particular Ranging Rook opening if White chooses a Static Rook opening while they may want to choose a different set of openings if White chooses a Ranging Rook opening. Therefore, pushing an edge pawn (2. P-16) in the first two moves is a noncommittal move by Black aiming to wait and see what their opponent's opening will be. This edge pawn push also fits well the common Mino castle construction on the right side regardless of whether playing against a Ranging Rook or Static Rook opponent. If White pushes their rook pawn indicating Static Rook (2...P-84), then Black can choose a Fourth File position. This is often seen in the Fujii System strategies, which can develop with 3. P-66 S-62 4. R-68 K-42 5. S-38.
