Rook and Bishop vs Rook: How to Defend the Draw

Rook and bishop versus rook is famous for being drawn in theory yet brutally hard to defend at the board. The attacker needs long, precise maneuvering, and the defender needs to know exactly where to stand.

The dangerous edge. Rook and bishop win only when the defending king is pressed to the edge with the kings in opposition (Philidor's position). The color of the corner is not what matters: Philidor's method wins on the central files and, with Lolli's analysis, on the bishop's file and the rook's file too. The file that holds is the knight's file, one in from the edge, so if your king is driven to the back rank, steer it there rather than into the corner.

The Cochrane defense. Position your rook so that it pins the attacking BISHOP against its own king along a rank or a file. With the bishop frozen, the attacker cannot coordinate for mate, and you hold. The other proven method is the second-rank defense: the rook sits on the rank directly in front of your king and walls off the mating squares. The Cochrane pin also keeps the kings one file, or one rank, farther apart than in the losing Philidor picture, so the attacker never quite opposes your king, and the second-rank wall only saves you on your own second rank or the knight file, where a rook check beside your king cannot be captured. One more lever is on your side: with no pawns left, once fifty moves pass without a capture you can claim the draw, so play for time, not miracles.

In this drill the attacker never lets up and will punish a drifting king or a passive rook. Keep your king off the edge, keep your rook active, and the half point is yours.