#euler characteristic (χ=v-e+f) euler_characteristic

#	Title	# Solved	Avg. Tries
3136	ARHITEKT	124	2.65
3413	The Dragon and the knights	38	2.11
3456	Football	9	1.11
4936	What’s your Logo?	10	1.90
5455	Mandalas	5	6.00
5488	That Nice Euler Circuit	4	1.25
9487	Cut the Cake	19	3.47
10049	切り取り線 (Cutting)	27	1.93
10569	Polyhedra	6,358	1.13
11975	Build Gates	140	1.73
14519	Raspad	19	1.21
15010	Hoarse Horses	64	3.56
15844	Land of the Rainbow Gold	11	1.36
16444	Cortador de Pizza	15	1.27
16683	종이 자르기	9	6.56
17191	Valleys	25	2.16
17442	삼분 그래프	32	7.41
18493	Face Recognition Algorithm	24	1.25
18589	Radar Scanner	18	1.22
18941	평면그래프와 게임	19	5.26
19552	Selecting Points and Segments	18	3.72
20573	Cactus Shoppe	5	1.20
20715	Island Archipelago	3	1.00
20939	달고나	14	6.14
20966	Paint by Letters	8	2.13
21501	Вышивка жемчугом	5	1.80
22767	Area Separation	5	1.00
24165	直線 (Lines)	10	5.10
25627	칼자국	7	1.43
28332	재하의 장난감	4	10.75

1