Increment cutoffCnt less often after fail high

Viren6 · Disservin · commit ec7f1d622942 · 2025-02-04T21:30:54.000+01:00
Only increment when extension is less than 2 or it's a PvNode. Tested vs #5851. Failed STC: LLR: -2.97 (-2.94,2.94) <0.00,2.00> Total: 360064 W: 94546 L: 94271 D: 171247 Ptnml(0-2): 1835, 42826, 90314, 43343, 1714 https://tests.stockfishchess.org/tests/view/679f79cc0774dfd78deb1112 Passed LTC: LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 443076 W: 113942 L: 113081 D: 216053 Ptnml(0-2): 480, 49076, 121579, 49909, 494 https://tests.stockfishchess.org/tests/view/679fa21b0774dfd78deb1178 Passed VLTC: LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 187184 W: 48098 L: 47495 D: 91591 Ptnml(0-2): 59, 19036, 54792, 19653, 52 https://tests.stockfishchess.org/tests/view/679fb6000774dfd78deb11e8 closes #5855 Bench: 3018089
diff --git a/src/search.cpp b/src/search.cpp
@@ -1350,7 +1350,8 @@ Value Search::Worker::search(
 
                 if (value >= beta)
                 {
-                    ss->cutoffCnt++;
+                    // (* Scaler) Especially if they make cutoffCnt increment more often.
+                    ss->cutoffCnt += (extension < 2) || PvNode;
                     assert(value >= beta);  // Fail high
                     break;
                 }

Original file line number	Diff line number	Diff line change
`@@ -1350,7 +1350,8 @@ Value Search::Worker::search(`
`1350`	`1350`
`1351`	`1351`	`if (value >= beta)`
`1352`	`1352`	`{`
`1353`		`- ss->cutoffCnt++;`
	`1353`	`+ // (* Scaler) Especially if they make cutoffCnt increment more often.`
	`1354`	`+ ss->cutoffCnt += (extension < 2) \|\| PvNode;`
`1354`	`1355`	`assert(value >= beta); // Fail high`
`1355`	`1356`	`break;`
`1356`	`1357`	`}`