From 7610745dc5c47743108dfc0cf556cb6a196cd5f9 Mon Sep 17 00:00:00 2001
From: Peter Osterlund <peterosterlund2@gmail.com>
Date: Mon, 13 Apr 2020 10:32:05 +0200
Subject: [PATCH] Reduce maxNPS when UCI_LimitStrength is enabled

---
 .../src/main/java/uci/EngineControl.java        | 17 ++++++++++++++++-
 .../engine/cuckoochess/DroidEngineControl.java  | 17 ++++++++++++++++-
 2 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/CuckooChess/src/main/java/uci/EngineControl.java b/CuckooChess/src/main/java/uci/EngineControl.java
index dc3b085..f3c2969 100644
--- a/CuckooChess/src/main/java/uci/EngineControl.java
+++ b/CuckooChess/src/main/java/uci/EngineControl.java
@@ -229,7 +229,7 @@ public class EngineControl {
         sc = new Search(pos, posHashList, posHashListSize, tt, ht);
         sc.timeLimit(minTimeLimit, maxTimeLimit);
         sc.setListener(new SearchListener(os));
-        sc.setStrength(getStrength(), randomSeed, maxNPS);
+        sc.setStrength(getStrength(), randomSeed, getMaxNPS());
         MoveGen.MoveList moves = moveGen.pseudoLegalMoves(pos);
         MoveGen.removeIllegal(pos, moves);
         if ((searchMoves != null) && (searchMoves.size() > 0))
@@ -483,4 +483,19 @@ public class EngineControl {
         }
         return eloToStrength[n-1][1];
     }
+
+    /** Return adjusted maxNPS value if UCI_LimitStrength is enabled. */
+    private int getMaxNPS() {
+        int intMax = Integer.MAX_VALUE;
+        int nps1 = maxNPS == 0 ? intMax : maxNPS;
+        int nps2 = nps1;
+        if (limitStrength) {
+            if (elo < 1350)
+                nps2 = Math.min(10000, nps2);
+            else
+                nps2 = Math.min(100000, nps2);
+        }
+        int nps = Math.min(nps1, nps2);
+        return nps == intMax ? 0 : nps;
+    }
 }
diff --git a/DroidFishApp/src/main/java/org/petero/droidfish/engine/cuckoochess/DroidEngineControl.java b/DroidFishApp/src/main/java/org/petero/droidfish/engine/cuckoochess/DroidEngineControl.java
index 5cd46ab..6691ad8 100644
--- a/DroidFishApp/src/main/java/org/petero/droidfish/engine/cuckoochess/DroidEngineControl.java
+++ b/DroidFishApp/src/main/java/org/petero/droidfish/engine/cuckoochess/DroidEngineControl.java
@@ -227,7 +227,7 @@ public class DroidEngineControl {
         sc = new Search(pos, posHashList, posHashListSize, tt, ht);
         sc.timeLimit(minTimeLimit, maxTimeLimit);
         sc.setListener(new SearchListener(os));
-        sc.setStrength(getStrength(), randomSeed, maxNPS);
+        sc.setStrength(getStrength(), randomSeed, getMaxNPS());
         sc.nodesBetweenTimeCheck = Math.min(500, sc.nodesBetweenTimeCheck);
         MoveGen.MoveList moves = moveGen.pseudoLegalMoves(pos);
         MoveGen.removeIllegal(pos, moves);
@@ -442,4 +442,19 @@ public class DroidEngineControl {
         }
         return eloToStrength[n-1][1];
     }
+
+    /** Return adjusted maxNPS value if UCI_LimitStrength is enabled. */
+    private int getMaxNPS() {
+        int intMax = Integer.MAX_VALUE;
+        int nps1 = maxNPS == 0 ? intMax : maxNPS;
+        int nps2 = nps1;
+        if (limitStrength) {
+            if (elo < 1350)
+                nps2 = Math.min(10000, nps2);
+            else
+                nps2 = Math.min(100000, nps2);
+        }
+        int nps = Math.min(nps1, nps2);
+        return nps == intMax ? 0 : nps;
+    }
 }