Score chain pawn also by rank

joergoster · mcostalba · commit 25cb851f8aa9 · 2013-10-18T10:27:55.000+02:00
Use the (rescaled) CandidatePassed[] table
that is already rank based.

Passed both short TC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 11048 W: 2272 L: 2135 D: 6641

And long TC
LLR: 2.97 (-2.94,2.94) [0.00,6.00]
Total: 4116 W: 769 L: 645 D: 2702

bench: 8440524
diff --git a/src/pawns.cpp b/src/pawns.cpp
@@ -176,7 +176,7 @@ namespace {
             value -= Backward[opposed][f];
 
         if (chain)
-            value += ChainMember[f];
+            value += ChainMember[f] + CandidatePassed[relative_rank(Us, s)] / 2;
 
         if (candidate)
         {

Original file line number	Diff line number	Diff line change
`@@ -176,7 +176,7 @@ namespace {`
`176`	`176`	`value -= Backward[opposed][f];`
`177`	`177`
`178`	`178`	`if (chain)`
`179`		`- value += ChainMember[f];`
	`179`	`+ value += ChainMember[f] + CandidatePassed[relative_rank(Us, s)] / 2;`
`180`	`180`
`181`	`181`	`if (candidate)`
`182`	`182`	`{`