diff --git a/src/worker/sql.rs b/src/worker/sql.rs
index 013d627..8421798 100644
--- a/src/worker/sql.rs
+++ b/src/worker/sql.rs
@@ -1217,45 +1217,74 @@ pub const QUERY_AUTOBATISM: &str = r#"
          );
 "#;
 
+// Biologische Fruchtbarkeit nach Alter der Frau (Jahres-Wahrscheinlichkeit).
+// Umrechnung auf Tages-Wahrscheinlichkeit: P_tag = 1 - (1 - P_jahr)^(1/365)
+// Grenzen in Tagen: 1 Jahr ≈ 365 Tage
 pub const QUERY_GET_PREGNANCY_CANDIDATES: &str = r#"
+        WITH mother_age AS (
+            SELECT
+                r.character1_id,
+                r.character2_id,
+                c1.title_of_nobility,
+                c1.last_name,
+                c1.region_id,
+                fu1.id AS father_uid,
+                fu2.id AS mother_uid,
+                (CURRENT_DATE - c2.birthdate::date)::int AS mother_age_days,
+                CASE
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 4380  THEN 0.005
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 4745  THEN 0.30
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 5110  THEN 0.45
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 5475  THEN 0.55
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 5840  THEN 0.60
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 6205  THEN 0.725
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 6570  THEN 0.80
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 7305  THEN 0.855
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 9125  THEN 0.875
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 10950 THEN 0.84
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 11315 THEN 0.785
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 11680 THEN 0.765
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 12045 THEN 0.74
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 12410 THEN 0.72
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 12775 THEN 0.695
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 13140 THEN 0.65
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 13505 THEN 0.63
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 13870 THEN 0.60
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 14235 THEN 0.55
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 14600 THEN 0.50
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 14965 THEN 0.45
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 15330 THEN 0.35
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 15695 THEN 0.25
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 16060 THEN 0.15
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 16425 THEN 0.075
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 16790 THEN 0.03
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 17155 THEN 0.02
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 17520 THEN 0.015
+                    WHEN (CURRENT_DATE - c2.birthdate::date) < 18250 THEN 0.005
+                    ELSE 0.001
+                END AS prob_year
+            FROM falukant_data.relationship r
+            JOIN falukant_type.relationship r2
+                ON r2.id = r.relationship_type_id AND r2.tr = 'married'
+            JOIN falukant_data.character c1 ON c1.id = r.character1_id
+            JOIN falukant_data.character c2 ON c2.id = r.character2_id
+            LEFT JOIN falukant_data.falukant_user fu1 ON fu1.id = c1.user_id
+            LEFT JOIN falukant_data.falukant_user fu2 ON fu2.id = c2.user_id
+        )
         SELECT
-            r.character1_id AS father_cid,
-            r.character2_id AS mother_cid,
-            c1.title_of_nobility,
-            c1.last_name,
-            c1.region_id,
-            fu1.id AS father_uid,
-            fu2.id AS mother_uid,
-            ((CURRENT_DATE - c1.birthdate::date)
-             + (CURRENT_DATE - c2.birthdate::date)) / 2 AS avg_age_days,
-            100.0 /
-                (1 + EXP(
-                         0.0647 * (
-                             ((CURRENT_DATE - c1.birthdate::date)
-                                + (CURRENT_DATE - c2.birthdate::date)) / 2
-                         ) - 0.0591
-                     )) AS prob_pct
-        FROM falukant_data.relationship r
-        JOIN falukant_type.relationship r2
-            ON r2.id = r.relationship_type_id
-         AND r2.tr = 'married'
-        JOIN falukant_data.character c1
-            ON c1.id = r.character1_id
-        JOIN falukant_data.character c2
-            ON c2.id = r.character2_id
-        LEFT JOIN falukant_data.falukant_user fu1
-            ON fu1.id = c1.user_id
-        LEFT JOIN falukant_data.falukant_user fu2
-            ON fu2.id = c2.user_id
-     WHERE random() * 100 < (
-            100.0 /
-                (1 + EXP(
-                         0.11166347 * (
-                             ((CURRENT_DATE - c1.birthdate::date)
-                                + (CURRENT_DATE - c2.birthdate::date)) / 2
-                         ) - 2.638267
-                     ))
-     ) / 2;
+            character1_id AS father_cid,
+            character2_id AS mother_cid,
+            title_of_nobility,
+            last_name,
+            region_id,
+            father_uid,
+            mother_uid,
+            mother_age_days,
+            (1 - POWER(1 - prob_year, 1.0/365.0)) * 100 AS prob_pct
+        FROM mother_age
+        WHERE mother_age_days >= 4380
+          AND mother_age_days < 18993
+          AND random() < (1 - POWER(1 - prob_year, 1.0/365.0));
 "#;
 
 pub const QUERY_INSERT_CHILD: &str = r#"