Remove NNUE scaling term

vondele · vondele · commit c6edf33f539f · 2021-12-14T13:41:12.000+01:00
remove pawns scaling, probably correlated with piece scaling, and might be less useful with the recent improved nets. Might allow for another tune of the scaling params. passed STC https://tests.stockfishchess.org/tests/view/61afdb2e56fcf33bce7df31a LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 280864 W: 72198 L: 72399 D: 136267 Ptnml(0-2): 854, 32356, 74346, 31889, 987 passed LTC https://tests.stockfishchess.org/tests/view/61b233a606b4c2dcb1b16140 LLR: 2.95 (-2.94,2.94) <-2.25,0.25> Total: 400136 W: 102669 L: 103012 D: 194455 Ptnml(0-2): 212, 42005, 116047, 41522, 282 closes #3851 Bench: 4735679
diff --git a/src/evaluate.cpp b/src/evaluate.cpp
@@ -1091,8 +1091,7 @@ Value Eval::evaluate(const Position& pos) {
       v = Evaluation<NO_TRACE>(pos).value();          // classical
   else
   {
-       int scale = 1049
-                   +  8 * pos.count<PAWN>()
+       int scale = 1136
                    + 20 * pos.non_pawn_material() / 1024;
 
        Value nnue     = NNUE::evaluate(pos, true);     // NNUE

Original file line number	Diff line number	Diff line change
`@@ -1091,8 +1091,7 @@ Value Eval::evaluate(const Position& pos) {`
`1091`	`1091`	`v = Evaluation<NO_TRACE>(pos).value(); // classical`
`1092`	`1092`	`else`
`1093`	`1093`	`{`
`1094`		`- int scale = 1049`
`1095`		`- + 8 * pos.count<PAWN>()`
	`1094`	`+ int scale = 1136`
`1096`	`1095`	`+ 20 * pos.non_pawn_material() / 1024;`
`1097`	`1096`
`1098`	`1097`	`Value nnue = NNUE::evaluate(pos, true); // NNUE`