From e08dd1256b8a6d8197e56867b43b47a92aadd1a7 Mon Sep 17 00:00:00 2001
From: eug-vs <eugene@eug-vs.xyz>
Date: Thu, 31 Aug 2023 11:35:22 +0300
Subject: refactor!: implement staged move generation

 - Skip move generation on ttable hit
 - Perform selection sort *iteratively* when pulling items
 - Fix killers probed from incorrect ply (still not ideal)
---
 src/grossmeister/mod.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'src/grossmeister/mod.rs')

diff --git a/src/grossmeister/mod.rs b/src/grossmeister/mod.rs
index 67b20bd..03bb828 100644
--- a/src/grossmeister/mod.rs
+++ b/src/grossmeister/mod.rs
@@ -1,17 +1,20 @@
 use std::sync::{atomic::AtomicBool, Arc};
 
+use smallvec::{SmallVec, smallvec};
+
 use crate::board::Board;
-use self::ttable::{TranspositionTable, TTABLE_SIZE};
+use self::{ttable::{TranspositionTable, TTABLE_SIZE}, move_selector::MoveSelector};
 
 mod ttable;
 mod evaluation;
 mod search;
 mod UCI;
+mod move_selector;
 
 /// Grossmeister is a powerful entity that plays the game of Chess.
 /// This structure represents a player, it stores his knowledge
 /// and experience about the game.
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct Grossmeister {
     /// GM's internal board representation
     /// This is usually a copy of a real board
@@ -22,6 +25,8 @@ pub struct Grossmeister {
     /// It's indexex by Zobrist hash of a position mod size
     transposition_table: TranspositionTable,
 
+    move_selectors: SmallVec<[MoveSelector; 0]>,
+
     should_halt: Arc<AtomicBool>,
     debug: bool,
 }
@@ -37,6 +42,7 @@ impl Grossmeister {
         Self {
             board,
             transposition_table: vec![None; TTABLE_SIZE as usize],
+            move_selectors: smallvec![MoveSelector::default(); 256],
             should_halt: Arc::new(AtomicBool::new(false)),
             debug: false,
         }
-- 
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