Problem A
Chess — Problem Statistics

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Submissions	6775
Accepted submissions	2175
Submission ratio	32.10%
Authors	2001
Full solves [?]	1719
Full solve Ratio	85.91%

#	User	Runtime	Language	Date
1	Przemysław Curzytek	0.03 s	C#	2016-11-07 05:18:52
2	Hidden user	0.03 s	C#	2017-04-17 20:58:05
3	Gustav Kalander	0.03 s	C#	2018-05-13 22:25:41
4	Joel Luis Chambilla Renjel	0.03 s	C#	2019-04-03 20:31:07
5	Raul Gamarra	0.03 s	C#	2019-04-05 16:04:10
6	Carl Magnusson	0.03 s	C#	2019-06-10 18:20:22
7	Hidden user	0.04 s	C#	2017-09-07 22:33:51
8	Dave Campbell	0.04 s	C#	2023-04-01 02:59:24
9	Khin Nyunt	0.05 s	C#	2017-01-01 13:54:35
10	Dieter Portanda	0.05 s	C#	2019-04-05 17:02:02

#	User	Runtime	Language	Date
1	Norbert Voelker	0.03 s	Go	2021-09-17 01:33:28
2	Ola Dahl	0.04 s	Go	2023-01-27 21:23:34
3	Khin Nyunt	0.06 s	Go	2023-09-14 06:23:55
4	JR	0.10 s	Go	2019-06-09 23:25:41
5	Johan Irvall Rasmussen	0.10 s	Go	2019-06-10 12:44:18
6	Việt Hà Nguyễn	0.11 s	Go	2016-06-15 18:57:55

#	User	Runtime	Language	Date
1	Johan H	0.01 s	Haskell	2017-05-10 22:00:42
2	Dmitrii Sapelkin	0.01 s	Haskell	2019-06-13 15:01:54
3	Hidden user	0.01 s	Haskell	2022-06-16 17:39:32
4	Steinar Simonnes	0.01 s	Haskell	2025-06-23 08:44:36
5	Morgan Hopkins	0.02 s	Haskell	2015-12-23 04:24:10
6	Brent Yorgey	0.02 s	Haskell	2018-10-21 21:47:42
7	Zach Tschetter	0.02 s	Haskell	2019-03-29 02:27:36
8	Matthew Gvasalia	0.02 s	Haskell	2023-05-03 17:14:05
9	Li Jun	0.02 s	Haskell	2023-06-22 19:00:53
10	Vegard Itland	0.03 s	Haskell	2017-08-24 22:57:34

#	User	Runtime	Language	Date
1	Niu Xinyuan	0.07 s	Java	2018-07-25 11:59:48
2	Bjørn Dons	0.07 s	Java	2018-10-19 20:08:08
3	Sven Rönnbäck	0.07 s	Java	2022-04-15 15:47:26
4	Martijn Muijsers	0.08 s	Java	2016-11-02 13:23:13
5	Nguyễn Hùng Cường	0.08 s	Java	2018-07-05 08:16:36
6	Sam Reinehr	0.08 s	Java	2018-10-17 03:49:12
7	Joel Vikström	0.09 s	Java	2016-11-19 11:02:30
8	Dat Vo Nguyen Tien	0.09 s	Java	2022-01-30 10:02:54
9	Axel Nilsson	0.09 s	Java	2023-07-10 21:14:04
10	Miles Stevenson	0.10 s	Java	2015-07-01 02:16:38

#	User	Runtime	Language	Date
1	Daniel Crosby	0.12 s	JavaScript (Node.js)	2024-04-22 18:19:42
2	Angelo Gazzola	0.15 s	JavaScript (Node.js)	2024-03-31 13:03:48
3	André Lehto	0.16 s	JavaScript (Node.js)	2019-02-23 15:47:02
4	Dominika Dembska	0.16 s	JavaScript (Node.js)	2024-07-15 18:03:52
5	Alex Wendte	0.20 s	JavaScript (Node.js)	2019-03-31 07:05:03
6	Khin Nyunt	0.54 s	JavaScript (Node.js)	2021-11-14 14:59:47
7	Daniel Cabral	0.55 s	JavaScript (Node.js)	2020-03-21 15:16:01

#	User	Runtime	Language	Date
1	Johannes Jensen	0.02 s	JavaScript (SpiderMonkey)	2016-03-05 15:19:48
2	Ionel Hindorean	0.02 s	JavaScript (SpiderMonkey)	2016-12-04 20:55:44
3	Dilawar Mahmood	0.02 s	JavaScript (SpiderMonkey)	2018-01-22 21:16:36
4	Bjørn Chr. Soltvedt	0.03 s	JavaScript (SpiderMonkey)	2016-02-20 23:32:00
5	Zachary DeStefano	0.04 s	JavaScript (SpiderMonkey)	2018-10-29 20:21:03
6	André Lehto	0.04 s	JavaScript (SpiderMonkey)	2019-02-22 01:12:25
7	Hidden user	0.04 s	JavaScript (SpiderMonkey)	2021-01-22 17:25:58
8	Christian Pilegaard Cederquist	0.04 s	JavaScript (SpiderMonkey)	2023-03-01 20:44:45
9	Robin Guan	0.05 s	JavaScript (SpiderMonkey)	2019-03-11 06:30:05
10	Peter Kedemo	0.35 s	JavaScript (SpiderMonkey)	2016-02-20 20:50:58

#	User	Runtime	Language	Date
1	Timothy Gaede	0.76 s	Julia	2024-06-26 08:11:05

#	User	Runtime	Language	Date
1	Sam Keyser	0.19 s	Kotlin	2022-06-22 22:02:12
2	Hidden user	0.25 s	Kotlin	2020-02-05 22:41:26
3	Ravisai Tiruvuri	0.27 s	Kotlin	2024-03-15 13:37:18
4	Ashish Singh	0.33 s	Kotlin	2023-01-24 08:12:31
5	Phường Lên	0.35 s	Kotlin	2020-03-30 03:47:41
6	Wojciech T	0.37 s	Kotlin	2023-11-17 16:12:12
7	Johnny Baloney	0.55 s	Kotlin	2021-10-31 22:21:56
8	Adam Koprowski	0.58 s	Kotlin	2020-10-16 23:30:12
9	Terairk	0.68 s	Kotlin	2023-12-06 14:21:56
10	Max Holmberg	0.92 s	Kotlin	2023-12-30 13:37:37

#	User	Runtime	Language	Date
1	Ingemar Ragnemalm	0.00 s	Pascal	2019-03-07 11:04:32

#	User	Runtime	Language	Date
1	Susanne Ragnemalm	0.02 s	PHP	2018-04-25 11:36:40

#	User	Runtime	Language	Date
1	Andriy Zyevakov	0.04 s	Prolog	2019-05-17 20:05:23
2	Jesper Amilon	0.07 s	Prolog	2020-08-06 16:01:29

#	User	Runtime	Language	Date
1	Mark Snow	0.07 s	Python 2	2016-12-06 21:35:32
2	Andrew Evans	0.07 s	Python 2	2018-09-12 00:35:38
3	Gustav Krantz	0.07 s	Python 2	2018-10-07 13:13:36
4	Sergey Vovk	0.08 s	Python 2	2015-03-25 07:23:12
5	Christofer Ohlsson	0.08 s	Python 2	2016-06-04 20:43:47
6	MrKatofa	0.08 s	Python 2	2017-05-10 22:08:24
7	Easton Bornemeier	0.08 s	Python 2	2018-03-09 22:40:13
8	Kristin Farris	0.08 s	Python 2	2018-03-09 23:08:10
9	Dario Vidas	0.09 s	Python 2	2016-02-04 21:46:48
10	Gaurav Kumar	0.10 s	Python 2	2015-04-16 15:36:21

#	User	Runtime	Language	Date
1	Jari Leskinen	0.03 s	Python 3	2015-09-30 23:18:39
2	Luke Winship	0.03 s	Python 3	2016-10-14 22:01:11
3	Oliver Richardson	0.03 s	Python 3	2016-11-07 02:05:34
4	Ram Basnet	0.03 s	Python 3	2017-11-13 07:31:12
5	Andrew McGehee	0.03 s	Python 3	2018-06-04 01:19:45
6	Samo Metličar	0.03 s	Python 3	2018-11-18 18:55:07
7	Hidden user	0.03 s	Python 3	2019-04-02 11:48:42
8	Alfred Olsson	0.03 s	Python 3	2019-07-22 15:11:25
9	Hidden user	0.03 s	Python 3	2019-09-09 04:16:56
10	Will Belote	0.03 s	Python 3	2019-09-11 20:44:26

#	User	Runtime	Language	Date
1	Rosa Gutierrez	0.07 s	Ruby	2022-05-02 08:49:55
2	Thomas Feld	0.07 s	Ruby	2023-05-10 10:22:45
3	Mridula Prabhu	0.15 s	Ruby	2019-04-03 20:16:38

#	User	Runtime	Language	Date
1	Got Yaoi	0.00 s	Rust	2019-01-26 03:14:50
2	Ryan O'Hara	0.00 s	Rust	2020-08-21 07:37:46
3	Pahlevi Fikri Auliya	0.00 s	Rust	2020-10-15 01:41:31
4	Christofer Nolander	0.01 s	Rust	2018-11-15 20:59:09
5	Hidden user	0.01 s	Rust	2019-03-26 20:07:30
6	Bas Dirks	0.01 s	Rust	2022-01-23 17:12:11
7	Isak Jägberg	0.01 s	Rust	2023-03-28 15:05:43
8	jaswanth	0.01 s	Rust	2024-03-09 08:55:31
9	Mathias Magnusson	0.02 s	Rust	2019-06-12 14:47:39
10	Egor Kulikov	0.06 s	Rust	2025-02-09 12:26:41

#	User	Runtime	Language	Date
1	Tinus Greyling	0.10 s	TypeScript	2025-03-08 11:12:47

#	User	Length	Language	Date
1	Erasmus Cedernaes	968	C	2015-11-24 19:20:40
2	Ivan Petrov	1073	C	2019-09-18 09:41:51
3	Alex Gajewski	1192	C	2016-04-30 19:56:11
4	Sergio Huhuhu	1251	C	2022-09-20 06:50:18
5	Raymond Yang	1325	C	2021-06-13 20:27:42
6	Sambit Palit	1370	C	2020-11-09 02:35:09
7	Đào Vũ Tuấn	1395	C	2016-09-09 07:40:52
8	Andrew Roberts	1457	C	2019-06-07 23:10:01
9	Phan Ngoc Lan	1491	C	2016-06-15 02:28:10
10	Hidden user	1533	C	2015-11-25 09:57:06

#	User	Length	Language	Date
1	Elmer Blixt	1907	C#	2024-06-13 19:19:07
2	Dave Campbell	1956	C#	2023-04-01 02:59:24
3	marizet human	2102	C#	2024-09-15 17:35:51
4	Hidden user	2328	C#	2017-09-07 22:33:51
5	Fredrik Blixt	2331	C#	2025-04-05 15:47:50
6	Sabah Alsaleh	2414	C#	2025-03-09 00:54:53
7	Jodie Jenecker	2473	C#	2024-09-30 15:21:45
8	Naveen Seerapu	2646	C#	2021-02-14 11:32:22
9	Mårten Åsberg	2789	C#	2025-07-30 08:33:34
10	Rebecca Hansson	2982	C#	2025-02-15 08:27:58

#	User	Length	Language	Date
1	Mugeon Kim	635	C++	2024-01-17 13:33:30
2	吳宗達	636	C++	2017-10-13 11:49:18
3	Shivang Paliwal	696	C++	2023-01-21 10:14:29
4	Hidden user	701	C++	2024-09-19 17:24:45
5	Johan Wind	711	C++	2015-09-14 23:57:32
6	Li Yao'an	722	C++	2017-01-11 16:10:34
7	Ziad Hassan	730	C++	2022-06-18 19:35:56
8	Danh Tran	732	C++	2018-06-11 14:45:22
9	Fabio Giovanazzi	739	C++	2021-11-15 21:43:53
10	Asmod B	739	C++	2022-01-11 07:49:35

#	User	Length	Language	Date
1	Norbert Voelker	1374	Go	2021-09-17 01:33:28
2	Johan Irvall Rasmussen	1401	Go	2019-06-10 12:44:18
3	Việt Hà Nguyễn	1436	Go	2016-06-15 18:57:55
4	JR	1579	Go	2019-06-09 23:25:41
5	Khin Nyunt	1906	Go	2023-09-14 06:23:55
6	Ola Dahl	4092	Go	2023-01-27 21:23:34

#	User	Length	Language	Date
1	Dmitrii Sapelkin	1009	Haskell	2019-06-13 15:01:54
2	Steinar Simonnes	1481	Haskell	2025-06-23 08:45:50
3	Li Jun	1555	Haskell	2023-06-22 19:16:49
4	Zach Tschetter	1574	Haskell	2019-03-29 02:27:36
5	Matthew Gvasalia	1632	Haskell	2023-05-03 17:14:05
6	Morgan Hopkins	1848	Haskell	2015-12-23 04:24:10
7	Brent Yorgey	1875	Haskell	2018-10-21 21:47:42
8	Johan H	2155	Haskell	2017-05-10 22:00:42
9	Vegard Itland	2228	Haskell	2017-08-24 22:57:34
10	Hidden user	2390	Haskell	2022-06-16 17:39:32

#	User	Length	Language	Date
1	Doug Goodman	1013	Java	2016-06-08 20:24:49
2	Kurtis Van Gent	1145	Java	2016-02-23 20:59:15
3	Simon Xue	1197	Java	2016-02-28 10:15:14
4	Jiru Xu	1244	Java	2017-10-15 19:27:28
5	Dhnguyen Nguyen	1253	Java	2016-09-07 10:30:14
6	Michael Stephen Skalak	1274	Java	2016-11-08 14:23:11
7	Niu Xinyuan	1295	Java	2018-07-25 11:59:48
8	Ranjith M	1304	Java	2021-03-14 06:57:03
9	Stephen Royal	1312	Java	2015-08-18 19:24:32
10	Benjamin Laurence Erickson	1312	Java	2016-02-26 01:39:37

#	User	Length	Language	Date
1	Dominika Dembska	1912	JavaScript (Node.js)	2024-07-15 18:03:52
2	Khin Nyunt	1954	JavaScript (Node.js)	2021-09-23 17:28:25
3	André Lehto	2758	JavaScript (Node.js)	2019-02-23 15:47:02
4	Angelo Gazzola	2836	JavaScript (Node.js)	2024-03-31 13:03:48
5	Daniel Crosby	4029	JavaScript (Node.js)	2024-04-22 18:19:42
6	Alex Wendte	4791	JavaScript (Node.js)	2019-03-31 07:05:03
7	Daniel Cabral	5963	JavaScript (Node.js)	2020-03-21 15:16:01

#	User	Length	Language	Date
1	Zachary DeStefano	1486	JavaScript (SpiderMonkey)	2018-10-29 20:21:03
2	Johannes Jensen	1518	JavaScript (SpiderMonkey)	2016-03-05 15:19:48
3	Christian Pilegaard Cederquist	1534	JavaScript (SpiderMonkey)	2023-03-01 20:44:45
4	Peter Kedemo	2009	JavaScript (SpiderMonkey)	2016-02-20 20:50:58
5	Bjørn Chr. Soltvedt	2026	JavaScript (SpiderMonkey)	2016-02-20 23:32:00
6	Hidden user	2553	JavaScript (SpiderMonkey)	2021-01-22 17:25:58
7	Robin Guan	3495	JavaScript (SpiderMonkey)	2019-03-11 06:30:05
8	Ionel Hindorean	4525	JavaScript (SpiderMonkey)	2016-12-04 20:55:44
9	Dilawar Mahmood	4585	JavaScript (SpiderMonkey)	2018-01-22 21:16:36
10	André Lehto	4585	JavaScript (SpiderMonkey)	2019-02-22 01:12:25

#	User	Length	Language	Date
1	Timothy Gaede	3058	Julia	2024-06-26 08:11:05

#	User	Length	Language	Date
1	Adam Koprowski	1534	Kotlin	2020-10-16 23:30:12
2	Johnny Baloney	1580	Kotlin	2021-10-31 22:26:23
3	Ashish Singh	1651	Kotlin	2023-01-24 08:12:31
4	Sam Keyser	1741	Kotlin	2022-06-22 22:02:12
5	Hidden user	2527	Kotlin	2020-02-05 22:41:26
6	Wojciech T	2646	Kotlin	2023-11-17 16:12:12
7	Phường Lên	2679	Kotlin	2020-03-30 03:47:41
8	Max Holmberg	3019	Kotlin	2023-12-30 13:37:37
9	Terairk	4503	Kotlin	2023-12-06 14:21:56
10	Ravisai Tiruvuri	6573	Kotlin	2024-03-15 13:37:18

#	User	Length	Language	Date
1	Ingemar Ragnemalm	1895	Pascal	2019-03-07 11:04:32

#	User	Length	Language	Date
1	Susanne Ragnemalm	1978	PHP	2018-04-25 11:36:40

#	User	Length	Language	Date
1	Andriy Zyevakov	1728	Prolog	2019-05-17 20:05:23
2	Jesper Amilon	3805	Prolog	2020-08-06 16:01:29

#	User	Length	Language	Date
1	Thomas Feld	543	Python 2	2019-09-06 10:03:14
2	Tore Norderud	959	Python 2	2015-05-14 20:37:17
3	Mark Snow	962	Python 2	2016-12-06 21:35:32
4	Andreas Björklund	990	Python 2	2021-11-17 16:44:42
5	Patrik Lilja	1009	Python 2	2015-05-21 18:31:54
6	Ciara Godwin	1012	Python 2	2018-09-02 21:51:08
7	Cian Ruane	1053	Python 2	2018-09-02 21:16:37
8	Vegard Berge	1063	Python 2	2019-08-26 10:52:30
9	Jason Cannon	1073	Python 2	2019-12-17 23:02:05
10	Conor McGovern	1081	Python 2	2019-02-10 18:47:01

#	User	Length	Language	Date
1	Ben Zydney	272	Python 3	2024-09-11 21:16:56
2	Lennart Meyling	318	Python 3	2024-09-15 17:20:17
3	Ahmed Chamseddine	349	Python 3	2025-06-24 14:15:17
4	Yong Mao	397	Python 3	2023-10-15 05:07:48
5	Charles Ancheta	414	Python 3	2023-03-30 07:32:46
6	Thibault Raffaillac	570	Python 3	2020-01-26 20:58:39
7	Chayapol Chaoveeraprasit	570	Python 3	2022-05-23 13:49:39
8	Alexandre Charland	572	Python 3	2025-07-01 00:30:34
9	Nicholas Russell Saerang	653	Python 3	2023-12-16 15:53:01
10	Ben Goldshteyn	725	Python 3	2024-08-03 23:59:14

#	User	Length	Language	Date
1	Thomas Feld	192	Ruby	2023-05-10 10:47:44
2	Rosa Gutierrez	1605	Ruby	2022-05-02 08:49:55
3	Mridula Prabhu	4713	Ruby	2019-04-03 20:16:38

#	User	Length	Language	Date
1	Got Yaoi	1515	Rust	2019-01-26 02:25:17
2	Mathias Magnusson	2095	Rust	2019-06-12 14:47:39
3	Bas Dirks	2337	Rust	2022-01-23 17:12:11
4	Christofer Nolander	3040	Rust	2018-11-15 20:59:09
5	Pahlevi Fikri Auliya	3517	Rust	2020-10-15 01:47:54
6	Ryan O'Hara	3626	Rust	2020-08-21 06:04:57
7	Mathias	4131	Rust	2022-06-20 18:50:00
8	jaswanth	4196	Rust	2024-03-09 08:55:31
9	Isak Jägberg	4639	Rust	2023-03-28 15:05:43
10	Hidden user	5735	Rust	2019-03-26 20:07:30

#	User	Length	Language	Date
1	Tinus Greyling	4456	TypeScript	2025-03-08 11:12:47

Solution running time distribution