Don't allow depth reductions of less than 1

Otherwise we might search the same depth indefinitely!
jgilchrist · Nov 21, 2024 · b476142 · b476142
1 parent 6d0fe0e
commit b476142
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/engine/search/negamax.rs b/src/engine/search/negamax.rs
@@ -10,6 +10,7 @@ use crate::engine::search::tables::lmr_table::lmr_reduction;
 use crate::engine::search::time_control::TimeStrategy;
 use crate::engine::search::transposition::{NodeBound, SearchTranspositionTableData};
 use crate::engine::tablebases::Wdl;
+use std::cmp::max;
 
 pub struct DepthReduction(u8);
 
@@ -28,7 +29,7 @@ impl DepthReduction {
 
     #[inline]
     pub fn value(&self) -> u8 {
-        self.0
+        max(1, self.0)
     }
 }