What Ruy Lopez puts on the board
Material is level, with black to move.
White has central pawns on e4; Black has central pawns on e5.
White can still castle either side; Black can still castle either side.
What White is trying to build
Maintain central tension and prepare d4 with pieces behind it.
Use the c3–d4 structure or queenside manoeuvres rather than rushing the bishop exchange.
How Black challenges it
Challenge White’s centre and find useful squares for the queenside pieces.
Decide whether the a6–b5 expansion gains space without loosening the queenside.
The tactical pattern to recognise
Pressure on e5 is often indirect because the e4 pawn can also be attacked.
A bishop capture on c6 can alter the pawn structure and the d5 square.
What to check before committing
Assuming Bxc6 wins the e5 pawn without checking the tactical reply.
Moving the same queenside pieces repeatedly while the king remains uncastled.
Choose the next book move
Preview a move to see the resulting position and the idea behind it. Select it to continue on the same board.