- Ensure you cannot move a pawn to the last rank without a promotion move.
- Ensure a pawn cannot make an illegal move, and that the board state remains
as it was before the move was attempted.
Add white castling for both wings. Found some bugs in how king sight is computed
while writing these.
In order for the king to perform the castle, the Movement bitboard needs to return
the two squares the king can castle to. That means anytime movement is calculated
for the king, the (relatively expensive) castling evaluation needs to happen.
Write two new helper static functions to create a Move for castling and promotion
moves. Since structs cannot have any functions with the same name, the two methods
that return properties related to those moves (Move::castle and Move::promotion)
need to be renamed. They're now called Move::castle_wing and Move::promotion_shape.
Implement making double push and promotion moves. Then write several tests to
exercise these. Add convenient static functions to the Move struct to build moves
quickly, without using the Builder.
Add a is_promotable_rank() method to Rank to check that a rank can be used for
promotion moves.
The tests found and fixed a bug in pawn movement where the en passant square was
being discarded when deciding whether an e.p. move can be made.
- Add a captures list to the Position struct
- Implement ToFenStr
- Update the imports list, which has been sorely out-of-date in the tree for many commits now.
Implement a new method on Position that evaluates whether the active color can castle
on a given wing of the board. Then, implement making a castling move in the position.
Make a new Wing enum in the core crate to specify kingside or queenside. Replace the
Castle enum from the board crate with this one. This caused a lot of churn...
Along the way fix a bunch of tests.
Note: there's still no way to actually make a castling move in explorer.
Implement thiserror::Error for a bunch of error types, and remove string errors
from the implementation of the command handler in explorer.
Clean up parsing of basic types all over the place.
Update Cargo files to include thiserror and anyhow.
Rework sight.rs and add a new module, movement.rs, to calculate piece sight and
movement. I discovered during this process that "sight" and "movement" are different
because pawns (in particular) can move in ways that don't follow their sight lines.
The routines in the movement module account for this, but also pass through to the
sight routines for other pieces.
Add two BitBoard attributes to the struct that mark squares that should be marked
or highlighted.
Empty marked squares are shown with an asterisk (*). Marked squares with a piece
don't have any change of appearance. (Something I'm still thinking about.)
Highlighted squares are shown with the ANSI escape sequence for Reverse Video.
Encapsulate castling rights within a small module. Castle provides the API to the
rest of the board package. Rights encodes the castling rights for each player.
Parameters defines castling parameters for each player.
Add chessfriend_bitboard::IterationDirection
Make BitBoard::occupied_squares() take an IterationDirection and return an iterator
corresponding to the direction.
Do the same for ::first_occupied_square().
