moving enum around

1 files changed, 36 insertions, 0 deletions

diff --git a/src/board/board.hpp b/src/board/board.hpp
index 6f72e56..35e2196 100644
--- a/src/board/board.hpp
+++ b/src/board/board.hpp
@@ -32,6 +32,42 @@ struct Position {
 
   bool operator==(const Position &) const = default;
 };
+
+/*
+ * Maybe we can try to be efficent with memory by using a byte (char) or
+ * something like that let me brainstorm a little
+ *
+ * first two bits can be promotion flag because there are 4 posible options:
+ * NONE BISHOP ROOK QUEEN
+ * but wait none it not requided because its only applied
+ * when on last rank
+ * but that doesnt help becuase we cant have three options
+ * ok so first 2 bits for promotion flag
+ * like this ZZYYYYYY with ZZ being the promotion flag
+ * 00 for none piece
+ * 01 for queen
+ * 10 for rook
+ * 11 for bishop
+ * these valuesa are abritrari
+ * so we have other 6 bytes which doesnt work that well because we need to store
+ * two 64 bit numbers one for "From" and second for "To"
+ * so wait how much is a 64 for bit
+ * 2 * 2 = 4 (2 bits)
+ * 4 * 2 = 8 (3 bits)
+ * 8 * 2 = 16 (4 bits)
+ * 16 * 2 = 32 (5 bits)
+ * 32 * 2 = 64 (6 bits)
+ * so six bits that means that we can only store one posiiton we need a 2 + 6 *
+ * 2 (14) bits of value to represent it but wait when promotion flag isnt 0 we
+ * know its last rank oh but we dont know if from white or black perpective so
+ * 14 bits is required let me search if there is a way to store that data
+ * alright search done result seams that best way is to use 16 bit interger
+ * which look like good solution and we have 2 bits left if we want to add more
+ * things here is a diagram for it uint16_t: XXFFFFFFTTTTTT XX for promotion
+ * flag F for from position T for to position so we can try first writing a
+ * helper function for working with it then replace existing move struct
+ */
+
 struct Move {
   Position From;
   Position To;