Simplify singularQuietLMR

unaiic · vondele · commit d6530f7d49ef · 2020-09-04T07:58:13.000+02:00
remove formerPV dependence STC https://tests.stockfishchess.org/tests/view/5f4cb922ba100690c5cc5d35 LLR: 2.96 (-2.94,2.94) {-1.25,0.25} Total: 113672 W: 12347 L: 12368 D: 88957 Ptnml(0-2): 566, 9537, 36699, 9420, 614 LTC https://tests.stockfishchess.org/tests/view/5f4e8474ba100690c5cc5e12 LLR: 2.93 (-2.94,2.94) {-0.75,0.25} Total: 43032 W: 2298 L: 2227 D: 38507 Ptnml(0-2): 45, 1940, 17475, 2011, 45 closes #3102 bench: 3290084
diff --git a/src/search.cpp b/src/search.cpp
@@ -1196,7 +1196,7 @@ namespace {
 
           // Decrease reduction if ttMove has been singularly extended (~3 Elo)
           if (singularQuietLMR)
-              r -= 1 + formerPv;
+              r--;
 
           if (!captureOrPromotion)
           {

Original file line number	Diff line number	Diff line change
`@@ -1196,7 +1196,7 @@ namespace {`
`1196`	`1196`
`1197`	`1197`	`// Decrease reduction if ttMove has been singularly extended (~3 Elo)`
`1198`	`1198`	`if (singularQuietLMR)`
`1199`		`- r -= 1 + formerPv;`
	`1199`	`+ r--;`
`1200`	`1200`
`1201`	`1201`	`if (!captureOrPromotion)`
`1202`	`1202`	`{`