The double bishop mate

Two bishops on parallel diagonals, a king in the corner, and one of the king's own pieces holding the only square the bishops cannot see.

5 positions in the course match this pattern
Lichess rating 796–2025
Section: Checkmate Patterns
Every line verified by the app’s rules engine

The pattern

The pattern, finished. The white king on h1 is in check from the bishop on c6. It has three squares to try and none of them work: g2 is covered by the bishop on c6; g1 is covered by the bishop on f2; h2 is blocked by its own pawn.

The king is in a corner. One bishop checks it along the long diagonal. The second bishop sits on the diagonal next to that one and covers the square the king would step to, and the third square is filled by a piece of the king's own -- in the standard case a pawn on h7 that the defender never moved.

The two diagonals are parallel and adjacent, not crossing. That is the difference from Boden's mate, where the diagonals cross on the king's square and the king is normally on an open file after castling queenside.

This is not the endgame technique. Searching for two bishops and mate mostly returns king and two bishops against a bare king, which is a twelve-move driving procedure. This is a middlegame pattern, usually one move, and the defender's own pieces are doing a third of the work.

What is always true

Each line below was tested against all 5 positions in this course that show the pattern, using the same rules engine the trainer runs on. The build stops if any of them is ever false, so the count beside each one is the real count.

The mated king is in a corner of the board 5/5
The checking piece is a bishop 5/5
A second bishop covers the king's escape squares 5/5
Exactly one square beside the king is blocked by a piece of its own 5/5

How to spot it

Both of your bishops on open, roughly parallel diagonals aimed at the same corner. This is a fianchetto structure more often than not.
An enemy king in the corner behind an unmoved pawn on h7 or h2.
A blocked long diagonal with a piece on it that can be removed with check or with a sacrifice. Clearing that diagonal is usually the whole idea.
The defender's dark-squared bishop. While it is on the long diagonal there is nothing here.

4 positions to solve

Real games, easiest first. The amber squares are the move your opponent has just played, not the answer. Work it out before you open the solution; the second diagram inside each answer is the finished mate with the trapped king outlined.

Six positions in the course carry this pattern and five of them have the king in a corner. That is a thin bank, and the page shows all of it rather than padding the count.

Position 1

Black to move. Force the mate.

Show the answer

25.g3 25...Bc6#

The white king on h1 is in check from the bishop on c6. It has three squares to try and none of them work: g2 is covered by the bishop on c6; g1 is covered by the bishop on f2; h2 is blocked by its own pawn.

The position comes from an endgame of a real game, rated 796 in the Lichess pool and scored there as mate in one. The amber squares on the first diagram are the move your opponent had just played.

Position 2

Black to move. Force the mate.

Show the answer

21.Bxc8 21...Bd5+ 22.e4 22...Bxe4#

The white king on h1 is in check from the bishop on e4, which the knight on f6 defends. It has three squares to try and none of them work: g2 is covered by the bishop on e4; g1 is covered by the bishop on f2; h2 is blocked by its own pawn.

The position comes from an endgame of a real game, rated 823 in the Lichess pool and scored there as mate in two. The amber squares on the first diagram are the move your opponent had just played.

Position 3

Black to move. Force the mate.

Show the answer

18.Bxe4 18...Qf3+ 19.Bxf3 19...Bxf3#

The white king on h1 is in check from the bishop on f3. It has three squares to try and none of them work: g1 is covered by the bishop on c5; g2 is covered by the bishop on f3; h2 is blocked by its own pawn.

The position comes from the middlegame of a real game, rated 2012 in the Lichess pool and scored there as mate in two. The amber squares on the first diagram are the move your opponent had just played.

Position 4

Black to move. Force the mate.

Show the answer

16.Bxf6 16...Qxf2+ 17.Kh1 17...Qf3+ 18.Bxf3 18...Bxf3#

The white king on h1 is in check from the bishop on f3. It has three squares to try and none of them work: g1 is covered by the bishop on d4; g2 is covered by the bishop on f3; h2 is blocked by its own pawn.

The position comes from the middlegame of a real game, rated 2025 in the Lichess pool and scored there as mate in three. The amber squares on the first diagram are the move your opponent had just played.

Drill the named mates until you see them 120 positions on the named mating patterns, in five graded levels, in the free Reflex Chess trainer. No account needed to start. Practise named mates

Easy to confuse with

These are the patterns Double Bishop Mate gets mistaken for. The difference is usually one piece or one square.

Questions people ask

What is the double bishop mate?

A checkmate against a king in the corner by two bishops working on neighbouring parallel diagonals, one giving check and one covering the escape square, with a piece of the king's own blocking the third.

Is the double bishop mate the same as mating with two bishops?

No. Mating with two bishops usually means the endgame technique of driving a bare king into a corner with king and two bishops, which takes a dozen or more moves. The double bishop mate is a middlegame pattern that finishes in one.

How is it different from Boden's mate?

Boden's uses two bishops on crossing diagonals against a king with two of its own pieces beside it, usually after queenside castling. The double bishop mate uses two parallel diagonals against a king in the corner.

All the named mates

One page each, or the whole set as a single motif in the course. The rest of the tactics library is at every motif in the course.