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Move Notes and ChessPieces docs to a doc directory

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Eryn Wells 2024-01-22 19:27:08 -08:00
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doc/ChessPieces.txt Normal file
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♔
WHITE CHESS KING
Unicode: U+2654, UTF-8: E2 99 94
♕
WHITE CHESS QUEEN
Unicode: U+2655, UTF-8: E2 99 95
♖
WHITE CHESS ROOK
Unicode: U+2656, UTF-8: E2 99 96
♗
WHITE CHESS BISHOP
Unicode: U+2657, UTF-8: E2 99 97
♘
WHITE CHESS KNIGHT
Unicode: U+2658, UTF-8: E2 99 98
♙
WHITE CHESS PAWN
Unicode: U+2659, UTF-8: E2 99 99
♚
BLACK CHESS KING
Unicode: U+265A, UTF-8: E2 99 9A
♛
BLACK CHESS QUEEN
Unicode: U+265B, UTF-8: E2 99 9B
♜
BLACK CHESS ROOK
Unicode: U+265C, UTF-8: E2 99 9C
♝
BLACK CHESS BISHOP
Unicode: U+265D, UTF-8: E2 99 9D
♞
BLACK CHESS KNIGHT
Unicode: U+265E, UTF-8: E2 99 9E
♟
chess pawn
Unicode: U+265F, UTF-8: E2 99 9F

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Notes on Building Chess Engines
===============================
BitBoards
---------
### Mapping
Little-Endian Rank-File (LERF) Mapping maps squares to bit offsets (or indexes) from a1 to h8.
```
+-----------------+
8| 0 0 0 0 0 0 0 0 |
7| 0 0 0 0 0 0 0 0 |
6| 0 0 0 0 0 0 0 0 |
5| 0 0 0 0 0 0 0 0 |
4| 0 0 0 0 0 0 0 0 |
3| 0 0 0 0 0 0 0 0 |
2| 0 0 0 0 0 0 0 0 |
1| 0 0 0 0 0 0 0 0 |
+-----------------+
A B C D E F G H
```
```
+-----------------+
8| 1 0 0 0 0 0 0 0 |
7| 1 0 0 0 0 0 0 0 |
6| 1 0 0 0 0 0 0 0 |
5| 1 0 0 0 0 0 0 0 |
4| 1 0 0 0 0 0 0 0 |
3| 1 0 0 0 0 0 0 0 |
2| 1 0 0 0 0 0 0 0 |
1| 1 0 0 0 0 0 0 0 |
+-----------------+
A B C D E F G H
```
### Counting Bit Sets
https://graphics.stanford.edu/%7Eseander/bithacks.html#CountBitsSetParallel