Rook & Knight Hold vs Queen
Black to play and draw
PlayRook and knight build a fortress against the queen: the two pieces defend each other and shield the king, and the queen alone cannot break in.
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Rook & Knight Hold vs Queen
Hold the draw against perfect play
Waking the engine…
The theory
A queen usually beats rook and knight, but in the right structure the two pieces build a fortress: they guard each other and the king, and the queen finds no fork or entry.
The queen's two tries, and the parries. (1) Win the knight by attacking it twice, or by a check that forks king and knight: parry by keeping the knight defended by the rook and the king off the forking squares. (2) Infiltrate with checks to drive the king into the open: parry by tucking the king behind its own pieces so every check runs into a block or a shuffle.
The losing break. The fortress falls the instant a piece is left undefended, or the king is forced onto a square where one queen move hits king and piece together. Keep the shape compact; never answer a check by scattering.
In this drill you defend with rook and knight. Hold the formation and refuse the forks: the tablebase queen cannot break a fortress that never cracks.