Maybe since 'Introduce Secondary TT Aging official-stockfish#6113'

pb00068 · pb00068 · commit cb62e5b0c0fa · 2025-06-03T09:09:00.000+02:00
this -4 offset is not needed anymore (-4 -replaced -2 in official-stockfish#575). bench: 2304390
diff --git a/src/tt.cpp b/src/tt.cpp
@@ -98,7 +98,7 @@ void TTEntry::save(
         move16 = m;
 
     // Overwrite less valuable entries (cheapest checks first)
-    if (b == BOUND_EXACT || uint16_t(k) != key16 || d - DEPTH_ENTRY_OFFSET + 2 * pv > depth8 - 4
+    if (b == BOUND_EXACT || uint16_t(k) != key16 || d - DEPTH_ENTRY_OFFSET + 2 * pv > depth8
         || relative_age(generation8))
     {
         assert(d > DEPTH_ENTRY_OFFSET);

Original file line number	Diff line number	Diff line change
`@@ -98,7 +98,7 @@ void TTEntry::save(`
`98`	`98`	`move16 = m;`
`99`	`99`
`100`	`100`	`// Overwrite less valuable entries (cheapest checks first)`
`101`		`- if (b == BOUND_EXACT \|\| uint16_t(k) != key16 \|\| d - DEPTH_ENTRY_OFFSET + 2 * pv > depth8 - 4`
	`101`	`+ if (b == BOUND_EXACT \|\| uint16_t(k) != key16 \|\| d - DEPTH_ENTRY_OFFSET + 2 * pv > depth8`
`102`	`102`	`\|\| relative_age(generation8))`
`103`	`103`	`{`
`104`	`104`	`assert(d > DEPTH_ENTRY_OFFSET);`