From c9d5d7a40e830cf47714fb276f7aa46fa4017512 Mon Sep 17 00:00:00 2001
From: "Shahin M. Shahin" <peregrineshahin@gmail.com>
Date: Mon, 23 Mar 2026 09:25:36 +0300
Subject: [PATCH] Fix a bug in `go depth`

Bench: 3554133
---
 src/search.rs | 8 +++++++-
 src/time.rs   | 3 +--
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/search.rs b/src/search.rs
index 2832b100..8d0941ab 100644
--- a/src/search.rs
+++ b/src/search.rs
@@ -5,6 +5,7 @@ use crate::{
     movepick::{MovePicker, Stage},
     stack::Stack,
     thread::{RootMove, Status, ThreadData},
+    time::Limits,
     transposition::{Bound, TtDepth},
     types::{
         ArrayVec, Color, MAX_PLY, Move, Piece, PieceType, Score, Square, draw, is_decisive, is_loss, is_valid, is_win,
@@ -77,8 +78,13 @@ pub fn start(td: &mut ThreadData, report: Report, thread_count: usize) {
     let mut best_move_changes = 0;
     let mut soft_stop_voted = false;
 
+    let max_depth = match td.time_manager.limits() {
+        Limits::Depth(maximum) => maximum,
+        _ => (MAX_PLY - 1) as i32,
+    };
+
     // Iterative Deepening
-    for depth in 1..MAX_PLY as i32 {
+    for depth in 1..=max_depth {
         best_move_changes /= 2;
 
         td.sel_depth = 0;
diff --git a/src/time.rs b/src/time.rs
index 7b9a9db8..aa1c087b 100644
--- a/src/time.rs
+++ b/src/time.rs
@@ -69,8 +69,7 @@ impl TimeManager {
 
     pub fn soft_limit(&self, td: &ThreadData, multiplier: impl Fn() -> f32) -> bool {
         match self.limits {
-            Limits::Infinite => false,
-            Limits::Depth(maximum) => td.completed_depth >= maximum,
+            Limits::Infinite | Limits::Depth(_) => false,
             Limits::Nodes(maximum) => td.shared.nodes.aggregate() >= maximum,
             Limits::Time(maximum) => self.start_time.elapsed() >= Duration::from_millis(maximum),
             _ => self.start_time.elapsed() >= Duration::from_secs_f32(self.soft_bound.as_secs_f32() * multiplier()),