Increase the depth margin

FauziAkram · Disservin · commit c085670b8474 · 2025-01-12T21:36:39.000+01:00
Tested at VVLTC against the passed patches. Test 1 against PR5764 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 167260 W: 43053 L: 42521 D: 81686 Ptnml(0-2): 7, 15272, 52542, 15800, 9 https://tests.stockfishchess.org/tests/view/6782ef196ddf09c0b4b6e780 Test 2 against PR5765 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 300012 W: 77364 L: 76771 D: 145877 Ptnml(0-2): 22, 27555, 94256, 28154, 19 https://tests.stockfishchess.org/tests/view/678366446ddf09c0b4b7028c closes #5768 Bench: 1379150
diff --git a/src/search.cpp b/src/search.cpp
@@ -1056,7 +1056,7 @@ Value Search::Worker::search(
             // and lower extension margins scale well.
 
             if (!rootNode && move == ttData.move && !excludedMove
-                && depth >= 4 - (thisThread->completedDepth > 33) + ss->ttPv
+                && depth >= 5 - (thisThread->completedDepth > 33) + ss->ttPv
                 && is_valid(ttData.value) && !is_decisive(ttData.value)
                 && (ttData.bound & BOUND_LOWER) && ttData.depth >= depth - 3)
             {

Original file line number	Diff line number	Diff line change
`@@ -1056,7 +1056,7 @@ Value Search::Worker::search(`
`1056`	`1056`	`// and lower extension margins scale well.`
`1057`	`1057`
`1058`	`1058`	`if (!rootNode && move == ttData.move && !excludedMove`
`1059`		`- && depth >= 4 - (thisThread->completedDepth > 33) + ss->ttPv`
	`1059`	`+ && depth >= 5 - (thisThread->completedDepth > 33) + ss->ttPv`
`1060`	`1060`	`&& is_valid(ttData.value) && !is_decisive(ttData.value)`
`1061`	`1061`	`&& (ttData.bound & BOUND_LOWER) && ttData.depth >= depth - 3)`
`1062`	`1062`	`{`