Bonus for rook on same file as their queen

xoto10 · snicolet · commit 36e4a86c08a4 · 2019-09-12T10:05:35.000+02:00
This patch creates a simple bonus for a rook that is on the same file as the opponent's queen. STC 10+0.1 th 1 : LLR: 2.95 (-2.94,2.94) [0.50,4.50] Total: 45609 W: 10120 L: 9733 D: 25756 http://tests.stockfishchess.org/tests/view/5d79895a0ebc5902d385484a LTC 60+0.6 th 1 : LLR: 2.96 (-2.94,2.94) [0.00,3.50] Total: 51651 W: 8606 L: 8288 D: 34757 http://tests.stockfishchess.org/tests/view/5d79a0850ebc5902d3854d27 Many thanks to @noobpwnftw for providing the extra cpu resources for fishtest, which led to me doing these tests. Closes #2297 Bench: 4024461
diff --git a/src/evaluate.cpp b/src/evaluate.cpp
@@ -140,6 +140,7 @@ namespace {
   constexpr Score PawnlessFlank      = S( 17, 95);
   constexpr Score RestrictedPiece    = S(  7,  7);
   constexpr Score RookOnPawn         = S( 10, 32);
+  constexpr Score RookOnQueenFile    = S( 11,  4);
   constexpr Score SliderOnQueen      = S( 59, 18);
   constexpr Score ThreatByKing       = S( 24, 89);
   constexpr Score ThreatByPawnPush   = S( 48, 39);
@@ -346,6 +347,10 @@ namespace {
             if (relative_rank(Us, s) >= RANK_5)
                 score += RookOnPawn * popcount(pos.pieces(Them, PAWN) & PseudoAttacks[ROOK][s]);
 
+            // Bonus for rook on same file as their queen
+            if (file_bb(s) & pos.pieces(Them, QUEEN))
+                score += RookOnQueenFile;
+
             // Bonus for rook on an open or semi-open file
             if (pos.is_on_semiopen_file(Us, s))
                 score += RookOnFile[bool(pos.is_on_semiopen_file(Them, s))];
