diff --git a/src/eval.rs b/src/eval.rs
index 4dd5e1f..bf93159 100644
--- a/src/eval.rs
+++ b/src/eval.rs
@@ -193,7 +193,7 @@ pub const PST_MIDGAME: Pst = Pst([
        -1,  -1,   2,  -1,   1,  -1,   2,   1, // 4
         2,   1,   1,   0,   0,   0,   0,   0, // 3
         0,   0,   0,   0,   0,   0,   0,   0, // 2
-        0,   0,   0,  10,  10,   5,   0,   0, // 1
+      -10,   0,   0,  10,  10,   5,   0, -10, // 1
     //  a    b    c    d    e    f    g    h
     ], 500),
 
@@ -231,18 +231,18 @@ pub const PST_MIDGAME: Pst = Pst([
         0,   0,   0,   0,   0,   0,   0,   0, // 5
         0,   0,   0,   0,   0,   0,   0,   0, // 4
         0,   0,   0,   0,   0,   0,   0,   0, // 3
-        0,   0,   0,   0,   0,   0,   0,   0, // 2
+        0,   0,   0,  -5,  -5,  -5,   0,   0, // 2
         0,   0,  10,   0,   0,   0,  20,   0, // 1
     //  a    b    c    d    e    f    g    h
     ], 20_000),
 
     // queen
     make_pst([
-        0,   0,   0,   0,   0,   0,   0,   0, // 8
-        0,   0,   0,   0,   0,   0,   0,   0, // 7
-        0,   0,   0,   0,   0,   0,   0,   0, // 6
-        0,   0,   0,   0,   0,   0,   0,   0, // 5
-        0,   0,   0,   0,   0,   0,   0,   0, // 4
+       -5,  -5,  -5,  -5,  -5,  -5,  -2,  -5, // 8
+       -5,  -5,  -5,  -5,  -5,  -5,  -2,  -5, // 7
+       -2,  -2,  -2,  -2,  -2,  -2,  -2,  -5, // 6
+       -2,  -2,  -2,  -2,  -2,  -2,  -2,  -5, // 5
+       -2,  -2,  -2,  -2,  -2,  -2,  -2,  -2, // 4
         0,   0,   0,   0,   0,   0,   0,   0, // 3
         0,   0,   0,   0,   0,   0,   0,   0, // 2
         0,   0,   0,   0,   0,   0,   0,   0, // 1
@@ -251,8 +251,8 @@ pub const PST_MIDGAME: Pst = Pst([
 
     // pawn
     make_pst([
-       10,  10,  10,  10,  10,  10,  10,  10, // 8
-        9,   9,   9,   9,   9,   9,   9,   9, // 7
+        0,   0,   0,   0,   0,   0,   0,   0, // 8
+       19,  19,  19,  19,  19,  19,  19,  19, // 7
         8,   8,   8,   8,   8,   8,   8,   8, // 6
         7,   7,   7,   8,   8,   7,   7,   7, // 5
         6,   6,   6,   6,   6,   6,   6,   6, // 4