diff --git a/pieces.py b/pieces.py
--- a/pieces.py
+++ b/pieces.py
@@ -1,10 +1,6 @@
 import numpy as np
 
 
-board=[[0]*4 for r in range(3)]
-steamboat=[[0,0,0],[1,1,1],[0,1,0]]
-
-
 def rotate(obj,axis,multiple):
 	"""[ # z
 		[[1,2,3], # y,x
@@ -25,7 +21,7 @@ def rotate(obj,axis,multiple):
 	shape_=abs(np.dot(shape,m))
 	middle=(shape-1)/2
 	middle_=(shape_-1)/2
-	res=np.zeros(shape_)
+	res=np.zeros(shape_,np.int32)
 
 	for (z,plane) in enumerate(obj):
 		for (y,row) in enumerate(plane):
@@ -37,8 +33,35 @@ def rotate(obj,axis,multiple):
 	return res
 
 
-def fits(board,piece,offset):
-	(dz,dy,dx)=offset
+def listRotations(obj):
+	rots=[(0,0),(1,1),(1,2),(1,3),(2,1),(2,3)]
+	res=[]
+	configs=set()
+
+	for (axis,multiple) in rots: # každou stěnu natočíme nahoru
+		obj_=rotate(obj,axis,multiple)
+		for i in range(4): # a protočíme kolem z
+			obj__=rotate(obj_,0,i)
+
+			h=(obj__.shape,obj__.tobytes()) # zbavíme se symetrií
+			if h not in configs:
+				res.append(obj__)
+				configs.add(h)
+
+	return res
+
+
+def listShifts(board,obj):
+	return [
+		(dz,dy,dx)
+		for dz in range(board.shape[0]-obj.shape[0]+1)
+		for dy in range(board.shape[1]-obj.shape[1]+1)
+		for dx in range(board.shape[2]-obj.shape[2]+1)
+	]
+
+
+def fits(board,piece,shift):
+	(dz,dy,dx)=shift
 	res=[]
 
 	for (z,plane) in enumerate(piece):
@@ -46,24 +69,22 @@ def fits(board,piece,offset):
 			for (x,item) in enumerate(row):
 				if item==0: continue
 				coords=(z+dz,y+dy,x+dx)
-				if board[coords]: return None
+				if board[coords]: return False
 				res.append(coords)
 	return res
 
 
 if __name__=="__main__":
-	# for r in range(-2,3):
-	# 	for c in range(-2,4):
-	# 		x=fits(board,steamboat,(r,c))
-	# 		if x: print((r,c),x)
+	board=np.zeros((1,2,3))
+	boat=np.array([[[0,1,0],[1,1,1]]])
+	es=np.array([[[1,1,0],[0,1,1]]])
+	el=np.array([[[1,1,1],[1,0,0]]])
 
-	# print(rotZ([[0,1,0,0],[0,1,0,0],[0,1,0,0],[0,0,0,0]]))
+	pieces={"boat":boat}
 
-	arr=np.array([ # z
-		[[1,2,3], # y,x
-		[4,5,6]],
-
-		[[7,8,9],
-		[10,11,12]]
-	])
-	print(rotate(arr,2,4))
+	for (name,piece) in pieces.items():
+		for p in listRotations(piece):
+			for shift in listShifts(board,p):
+				fit=fits(board,p,shift)
+				if fit is not False:
+					print(fit)