update rule

utils/utils.js

@@ -13,8 +13,29 @@ let Utils = {
         let eB = 1 / (1 + Math.pow(10, (rA - rB) / 400))
 
         let rrA = rA + k * (sA - eA)
+        
+        // 加分高于16
+        if( (rrA - rA) > 16 ) {
+            rrA  = rA + 16;
+        }
+
+        // 扣分低于8
+        if( (rA - rrA) < 8 ) {
+            rrA = rA - 8;
+        }
+
         let rrB = rB + k * (sB - eB)
 
+        // 加分高于16
+        if( (rrB - rB) > 16 ) {
+            rrB  = rB + 16;
+        }
+
+        // 扣分低于8
+        if( (rB - rrB) < 8 ) {
+            rrB = rB - 8;
+        }
+
         return { ptA: rrA, ptB: rrB }
     },
     getExpScore: function getExpScore(expA, expB, scoreA, scoreB) {