diff --git a/src/Engine/PeSTO.php b/src/Engine/PeSTO.php index 9e767c0..22ec908 100644 --- a/src/Engine/PeSTO.php +++ b/src/Engine/PeSTO.php @@ -222,7 +222,7 @@ class PeSTO implements Heuristic { $index = $rank * 8 + $file; if ($piece->getSide() == Side::BLACK) { - $index = 64 - $index; + $index = 63 - $index; } return [