Special cases

[Henk]

If there is a bishop in a corner protecting his own pawn on the next adjacent square you have a problem. I mean white bishop an a1 protecting white pawn on b2 etcetera. Of course that does not work for a white bishop on a8 or h8.

[Henk]

What about any piece on the border pinned by a bishop ?

[stegemma]

What about any piece on the border pinned by a bishop ?

You just forget chessboard greater than 8 rows/columns or... with negative indexes, like a-1, a-2 and so on. You forget some kind of 3D or multiple dimensions chessboard too and even the case of chessboard where square has been bad mounted, so that a1 is in the middle (this happens sometime with Rubik cubes).

I'm afraid that chess programming has nothing more important to say today, after the Kasparov defeat...

[Dann Corbit]

What about any piece on the border pinned by a bishop ?

Besides the obvious hard pin:
[d]R3bk1r/8/8/8/B7/8/8/3K4 b - -

There is also a near-pin or pragmatic pin:
[d]R3bq2/7k/8/8/B7/8/8/3K4 b - -

In order to understand what it is you are asking more clearly, could you supply some positions that illustrate the problem?

[Henk]

In these cases the piece was pinned by a rook and not a bishop.

'Pinner' is the piece that does not allow another piece to move.

[Henk]

What about any piece on the border pinned by a bishop ?

You just forget chessboard greater than 8 rows/columns or... with negative indexes, like a-1, a-2 and so on. You forget some kind of 3D or multiple dimensions chessboard too and even the case of chessboard where square has been bad mounted, so that a1 is in the middle (this happens sometime with Rubik cubes).

I'm afraid that chess programming has nothing more important to say today, after the Kasparov defeat...

There is a kolder chess tournament next week so I have to be prepared.

[Dann Corbit]

In these cases the piece was pinned by a rook and not a bishop.

'Pinner' is the piece that does not allow another piece to move.

If that is the definition you are using then nothing on the edge is pinned by a bishop for obvious reasons. OK, I am just going to say it. There can't be anything behind it.