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🕸Fergus Duniho wrote on Sun, Apr 17, 2022 03:02 PM UTC in reply to Gerd Degens from 09:25 AM:

I have indeed trouble with your question. I don't understand how "B b4-b3" or "B b3-b5" has anything to do with a bishop's moves.

You may be familiar with abbreviated algebraic notation, such as Bb3, which would mean to move a Bishop to b3. This abbreviated notation depends upon knowledge of the position and knowledge of the rules. Without these, you don't know where the Bishop is, and if a player has more than one Bishop, you don't know which Bishop to move there.

Since Chess variants are played by a variety of different rules, it helps to use a generic rule-blind notation that can work equally well for different variants. The notation I used explicitly spells out a move in a manner that someone could follow without knowing the rules of the game in question. First of all, "B b4-b3" is a typo. I meant to write "B b5-b3", which means a move by the Bishop on b5 to b3. This is a possible move only if there is already a Bishop on b5, and whether it's a legal move depends on the rules of the game. In Miller's Spherical Chess, for example, it would sometimes be a legal move. Likewise, "B b3-b5" means a move by a Bishop on b3 to b5. It should now be evident what these have to do with Bishop moves.


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