The Wrong Bishop
Black to play and draw
PlayBishop AND extra pawn, and it's still a dead draw, because the bishop doesn't speak the color of the promotion square. Sit in the corner; they can never evict you.
No signup needed. The opponent never gives up, and every mistake gets explained.
The Wrong Bishop
Hold the draw against perfect play
Setting up the board…
The theory
No exception saves more lost games than this one: bishop plus rook pawn, where the bishop does not control the promotion corner, is a draw: no matter how many tempi, how perfect the technique, how strong the attacker.
Why it holds. To promote, the pawn needs the king evicted from the corner. Eviction requires controlling the corner square, but the attacking king can't do it from adjacent squares without delivering stalemate first, and the bishop, forever stuck on the wrong color, cannot do it at all. The defense is literally: stand in the corner, alternate between the two safe squares.
The checklist before simplifying. Trading into bishop endings is where this knowledge pays: 'if I give up my last kingside pawn, is his remaining pawn a rook pawn? Is his bishop the wrong color for its corner?' Two yeses and any material deficit becomes irrelevant.
In the drill the attacker probes every geometry: zugzwang tries, bishop maneuvers, king triangulation. Watching perfect play achieve nothing against three squares of technique is the fastest way to trust this defense forever.