Two-bishop mate
Also known as Bishop pair mate
With king and two bishops against a lone king, you cannot mate in the centre - you must shepherd the enemy king to a corner first. There the two bishops, working on neighbouring diagonals, seal every flight square while your own king guards the rest, producing a forced checkmate.
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How it works
The mate happens in a corner (here h8). The two bishops cover one colour complex each, so together they can blanket a whole region of squares. In the finish, one bishop checks the king along its diagonal while the other bishop covers the only same-rank or diagonal escape; your king stands close by to deny the remaining flight squares and to defend the checking bishop. With the corner square attacked and every neighbour either guarded or off-limits, the king has nowhere to go.
How to spot it
This is an endgame technique rather than a middlegame trap: you reach it when you have both bishops and the opponent is down to a bare king. The plan is always the same - build a barrier with the two bishops on adjacent diagonals, then walk that wall forward, using your king to shoulder the enemy king toward a corner. As the barrier advances the enemy king loses squares until a bishop check on the edge becomes mate. Aim the king at any corner; you do not need a particular colour of corner with two bishops.
Key ideas
- Two bishops cannot mate in open space - drive the king to a corner first.
- Place the bishops on adjacent diagonals to form a moving wall.
- Your king does the herding; the bishops do the cutting off.
- The final check comes on the edge, with one bishop checking and the other covering the escape.
- Take care not to stalemate: leave the king a square until the mating move.
Famous example
A standard checkmating technique every player should know - it appears in classic endgame manuals such as Capablanca's Chess Fundamentals and is a required skill for converting the two-bishop advantage.