Added IPC 2000 Blocks World example instances.

instances/ipc-2000-blocks-track-1-typed/domain.pddl

@@ -0,0 +1,49 @@
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;;; 4 Op-blocks world
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(define (domain BLOCKS)
+  (:requirements :strips :typing)
+  (:types block)
+  (:predicates (on ?x - block ?y - block)
+	       (ontable ?x - block)
+	       (clear ?x - block)
+	       (handempty)
+	       (holding ?x - block)
+	       )
+
+  (:action pick-up
+	     :parameters (?x - block)
+	     :precondition (and (clear ?x) (ontable ?x) (handempty))
+	     :effect
+	     (and (not (ontable ?x))
+		   (not (clear ?x))
+		   (not (handempty))
+		   (holding ?x)))
+
+  (:action put-down
+	     :parameters (?x - block)
+	     :precondition (holding ?x)
+	     :effect
+	     (and (not (holding ?x))
+		   (clear ?x)
+		   (handempty)
+		   (ontable ?x)))
+  (:action stack
+	     :parameters (?x - block ?y - block)
+	     :precondition (and (holding ?x) (clear ?y))
+	     :effect
+	     (and (not (holding ?x))
+		   (not (clear ?y))
+		   (clear ?x)
+		   (handempty)
+		   (on ?x ?y)))
+  (:action unstack
+	     :parameters (?x - block ?y - block)
+	     :precondition (and (on ?x ?y) (clear ?x) (handempty))
+	     :effect
+	     (and (holding ?x)
+		   (clear ?y)
+		   (not (clear ?x))
+		   (not (handempty))
+		   (not (on ?x ?y)))))

instances/ipc-2000-blocks-track-1-typed/problem-04-00.pddl

@@ -0,0 +1,7 @@
+(define (problem BLOCKS-4-0)
+(:domain BLOCKS)
+(:objects D B A C - block)
+(:INIT (CLEAR C) (CLEAR A) (CLEAR B) (CLEAR D) (ONTABLE C) (ONTABLE A)
+ (ONTABLE B) (ONTABLE D) (HANDEMPTY))
+(:goal (AND (ON D C) (ON C B) (ON B A)))
+)

instances/ipc-2000-blocks-track-1-typed/problem-05-01.pddl

@@ -0,0 +1,7 @@
+(define (problem BLOCKS-5-1)
+(:domain BLOCKS)
+(:objects A D C E B - block)
+(:INIT (CLEAR B) (CLEAR E) (CLEAR C) (ONTABLE D) (ONTABLE E) (ONTABLE C)
+ (ON B A) (ON A D) (HANDEMPTY))
+(:goal (AND (ON D C) (ON C B) (ON B A) (ON A E)))
+)

instances/ipc-2000-blocks-track-1-typed/problem-08-01.pddl

@@ -0,0 +1,7 @@
+(define (problem BLOCKS-8-1)
+(:domain BLOCKS)
+(:objects B A G C F D H E - block)
+(:INIT (CLEAR E) (CLEAR H) (CLEAR D) (CLEAR F) (ONTABLE C) (ONTABLE G)
+ (ONTABLE D) (ONTABLE F) (ON E C) (ON H A) (ON A B) (ON B G) (HANDEMPTY))
+(:goal (AND (ON C D) (ON D B) (ON B G) (ON G F) (ON F H) (ON H A) (ON A E)))
+)

instances/ipc-2000-blocks-track-1-typed/problem-09-02.pddl

@@ -0,0 +1,8 @@
+(define (problem BLOCKS-9-2)
+(:domain BLOCKS)
+(:objects B I C E D A G F H - block)
+(:INIT (CLEAR H) (CLEAR F) (ONTABLE G) (ONTABLE F) (ON H A) (ON A D) (ON D E)
+ (ON E C) (ON C I) (ON I B) (ON B G) (HANDEMPTY))
+(:goal (AND (ON F G) (ON G H) (ON H D) (ON D I) (ON I E) (ON E B) (ON B C)
+            (ON C A)))
+)

instances/ipc-2000-blocks-track-1-typed/solutions

@@ -0,0 +1,6 @@
+instance | minimal horizon | #solutions with minimal horizon
+============================================================
+problem-04-00.pddl | 6 | 1
+problem-05-01.pddl | 10 | 2
+problem-08-01.pddl | 20 | 60
+problem-09-02.pddl | 20 | 37