From 78f070419e1017f491955e3afc1540e1454a8254 Mon Sep 17 00:00:00 2001
From: Niklas Fiekas <niklas.fiekas@backscattering.de>
Date: Sun, 9 Jul 2023 11:10:40 +0200
Subject: [PATCH] precompute mixednessRegions again

---
 src/main/scala/Divider.scala | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/main/scala/Divider.scala b/src/main/scala/Divider.scala
index a4d1eb9bc..b6a54ff4c 100644
--- a/src/main/scala/Divider.scala
+++ b/src/main/scala/Divider.scala
@@ -77,11 +77,16 @@ object Divider:
 
       case _ => 0
 
-  private def mixedness(board: Board): Int = {
+  private val mixednessRegions: List[Bitboard] = {
     val smallSquare = 0x0303L.bb
     for
       y <- 0 to 6
       x <- 0 to 6
       region = smallSquare << (x + 8 * y)
-    yield board.byColor.map(c => (c & region).count).reduce(score(y + 1))
-  }.sum
+    yield region
+  }.toList
+
+  private def mixedness(board: Board): Int =
+    mixednessRegions.foldLeft(0): (acc, region) =>
+      val y = region.first.get.rank.index + 1
+      acc + board.byColor.map(c => (c & region).count).reduce(score(y))