From 86388292cb517cf1200a2ff913a4c2930e04b9cf Mon Sep 17 00:00:00 2001
From: Thibault Duplessis <t@lichess.org>
Date: Fri, 3 May 2024 16:22:19 +0200
Subject: [PATCH] detect tactical motifs in games

Similar to what the puzzle tagger does
https://github.com/ornicar/lichess-puzzler/blob/master/tagger/cook.py
---
 build.sbt                        |  8 ++++++++
 motif/README.md                  |  2 ++
 motif/src/main/scala/Motif.scala | 14 ++++++++++++++
 3 files changed, 24 insertions(+)
 create mode 100644 motif/README.md
 create mode 100644 motif/src/main/scala/Motif.scala

diff --git a/build.sbt b/build.sbt
index 999f52d6..48c8bc2c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -54,6 +54,14 @@ lazy val playJson: Project = Project("playJson", file("playJson"))
   )
   .dependsOn(scalachess)
 
+lazy val motif: Project = Project("motif", file("motif"))
+  .settings(
+    commonSettings,
+    name := "scalachess-motif",
+    libraryDependencies
+  )
+  .dependsOn(scalachess)
+
 lazy val bench = project
   .enablePlugins(JmhPlugin)
   .settings(commonSettings, scalacOptions -= "-Wunused:all", name := "bench")
diff --git a/motif/README.md b/motif/README.md
new file mode 100644
index 00000000..3001b127
--- /dev/null
+++ b/motif/README.md
@@ -0,0 +1,2 @@
+Detect tactical motifs in games.
+Similar to what [the puzzle tagger](https://github.com/ornicar/lichess-puzzler/blob/master/tagger/cook.py) does.
diff --git a/motif/src/main/scala/Motif.scala b/motif/src/main/scala/Motif.scala
new file mode 100644
index 00000000..363dfa25
--- /dev/null
+++ b/motif/src/main/scala/Motif.scala
@@ -0,0 +1,14 @@
+package chess
+package motif
+
+enum Motif:
+  case fork
+  case doubleCheck
+  case xRay
+
+case class MotifAt(motif: Motif, at: Ply)
+
+object MotifAt:
+
+  def findAll(replay: Replay): List[MotifAt] =
+    Nil