Increase weight for supported pawns

snicolet · snicolet · commit 667d24f22743 · 2019-09-24T12:54:02.000+02:00
This patch changes the weight for counting supports of pawns from 17 to 21. Hopefully Stockfish will accept to play a bit more of closed or semi-closed positions. STC: LLR: 2.95 (-2.94,2.94) [0.00,4.00] Total: 13822 W: 3158 L: 2939 D: 7725 http://tests.stockfishchess.org/tests/view/5d89c3a10ebc595091802379 LTC: LLR: 2.96 (-2.94,2.94) [0.00,4.00] Total: 63066 W: 10590 L: 10236 D: 42240 http://tests.stockfishchess.org/tests/view/5d89ca7f0ebc595091802680 Future work: try to tweak the evaluation to better understand the French structures. Closes #2326 Bench: 3618154
diff --git a/src/pawns.cpp b/src/pawns.cpp
@@ -131,7 +131,7 @@ namespace {
         if (support | phalanx)
         {
             int v =  Connected[r] * (2 + bool(phalanx) - opposed)
-                   + 17 * popcount(support);
+                   + 21 * popcount(support);
 
             score += make_score(v, v * (r - 2) / 4);
         }

Original file line number	Diff line number	Diff line change
`@@ -131,7 +131,7 @@ namespace {`
`131`	`131`	`if (support \| phalanx)`
`132`	`132`	`{`
`133`	`133`	`int v = Connected[r] * (2 + bool(phalanx) - opposed)`
`134`		`- + 17 * popcount(support);`
	`134`	`+ + 21 * popcount(support);`
`135`	`135`
`136`	`136`	`score += make_score(v, v * (r - 2) / 4);`
`137`	`137`	`}`