From 3965ed40b05020eb7250a6270dd7df1bb3f5c4ee Mon Sep 17 00:00:00 2001
From: eug-vs <eugene@eug-vs.xyz>
Date: Wed, 25 Jan 2023 12:23:04 +0300
Subject: feat: use moves at cut-nodes as hash moves too

---
 src/board/engine.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'src/board/engine.rs')

diff --git a/src/board/engine.rs b/src/board/engine.rs
index 0a99def..821e65a 100644
--- a/src/board/engine.rs
+++ b/src/board/engine.rs
@@ -135,7 +135,7 @@ impl Board {
 
         match self.transposition_table[(self.hash % TTABLE_SIZE) as usize] {
             Some(item) => {
-                if item.node_type == NodeType::PV && item.hash == self.hash {
+                if item.hash == self.hash {
                     moves.insert(0, item.best_move);
                 }
             }
@@ -158,6 +158,14 @@ impl Board {
                 self.unmake_move(mov, captured_piece, ep_target_before, castling_rights_before, hash_before);
 
                 if score >= beta {
+                    self.transposition_table[(self.hash % TTABLE_SIZE) as usize] = Some(TranspositionTableItem {
+                        hash: self.hash,
+                        best_move: mov,
+                        depth: depth_left, // TODO: should be actual depth searched
+                        node_type: NodeType::Cut,
+                        score,
+                    });
+
                     return (beta, principal_variation);
                 }
                 if score > alpha {
@@ -199,7 +207,7 @@ impl Board {
 
         match self.transposition_table[(self.hash % TTABLE_SIZE) as usize] {
             Some(item) => {
-                if item.node_type == NodeType::PV && item.hash == self.hash {
+                if item.hash == self.hash {
                     moves.insert(0, item.best_move);
                 }
             }
-- 
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