What Réti Opening: Penguin Variation puts on the board
Material is level, with black to move.
Black has central pawns on d4.
White can still castle queenside; Black can still castle either side.
What White is trying to build
Pressure the centre with pieces before deciding which pawns will occupy it.
Use a kingside fianchetto to make e5 and d4 central decisions costly.
How Black challenges it
Build a centre that can survive c4 and d4 pawn breaks.
Keep development flexible enough to meet a transposition.
The tactical pattern to recognise
The g2 bishop gains force when the centre or queenside opens.
Many move orders transpose into English, Catalan or queen’s-pawn structures.
What to check before committing
Allowing a large centre without preparing a pawn break against it.
Treating a transposition as if the original move-order plan still applies unchanged.
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.