Nakuru Open Chess Champoinship 2025 -Open Section

Open SwissStandard

95 players participated in this 6-round tournament, held from 15 Nov 2025 to 16 Nov 2025 in Nakuru, Kenya. 6 titled players from 2 federations. Top 10 Elo average was 2053, and top seed was Gong Thon Gong (🇸🇸 SSD, CM, 2207).

Manyok Chaderek P (🇸🇸 SSD, 2098) won with 5.5/6, ahead of Ngong Samuel Gai (5.5) and Peter Majur Manyang (5.0). P shared the lead from round 5, winning on tie-break.

The biggest upset came in round 2: Ongeri Moses Obure (1442) beat Philip Mbawala Singe (1794), a +352-point gap.

Location

🇰🇪Nakuru, Kenya

Dates

15 Nov 2025 → 16 Nov 2025

Time control

Standard: 90 minutes for the whole game

System

Swiss · 6 rounds

Top seed

🇸🇸CMGong Thon Gong2207

Avg top 10

2,053

Participants

Titled players · 6

FM×2

CM×3

WFM×1

Federations · 2 represented

🇰🇪Kenya×77

🇸🇸South Sudan×6

Top 3

🥇
Manyok Chaderek P
🇸🇸SSD·2098
5.5pts·2337perf+25.8
🥈
Ngong Samuel Gai
🇸🇸SSD·2001
5.5pts·2234perf+25.0
🥉
FMPeter Majur Manyang
🇸🇸SSD·2104
5.0pts·2127perf+3.6

How it unfolded

Top 6 · 6 rounds

Tight race until R6; 2 players tied at 5.5/6, decided on Buchholz.

Co-leaders

Manyok Chaderek5.5Gai5.5Omolo5Manyang5Okeyo4.5Jadon4.5

R6 · TIEBREAK CLUSTER

2 players finish on 5.5/6. P takes the title on Buchholz Cut1 (20.0).

WIN STREAKS · 3 top finishers

Manyok Chaderek P 5 wins (R2–R6)Ngong Samuel Gai 4 wins (R3–R6)Kenneth Omolo 3 wins (R4–R6)

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	Pts	Bu C1	Bu	SB	Perf	Δ
1	Manyok Chaderek P	2098	SSD	=29N	+17B	+28N	+7B	+26N	+6B	5.5	20.0	23.5	21.75	2337	+25.8
2	Ngong Samuel Gai	2001	SSD	+13B	=27N	+71B	+12N	+25N	+10B	5.5	19.0	21.0	19.25	2234	+25.0
3	Peter Majur ManyangFM	2104	SSD	+32B	−10N	+23B	+11B	+18N	+13N	5.0	20.0	23.5	19.50	2127	+3.6
4	Omolo, Kenneth	1939	KEN	+20N	+15B	−5B	+70N	+33N	+19B	5.0	20.0	22.0	17.50	2096	+23.0
5	Simiyu JadonFM	2129	KEN	+18N	+75B	+4N	+10B	−6N	=8B	4.5	22.0	24.0	17.25	2149	+7.0
6	Gong Thon GongCM	2207	SSD	=28B	+37N	+57B	+27N	+5B	−1N	4.5	20.5	23.0	15.75	2126	-7.0
7	Boera Felix	1951	KEN	+42B	=57N	+40B	−1N	+34B	+25N	4.5	18.5	21.0	14.25	2013	+8.6
8	Okeyo, Steve Austine	1903	KEN	−43B	+46N	+52B	+56N	+45B	=5N	4.5	16.5	19.0	13.75	1899	+3.2
9	Omondi Stanley	1750	KEN	−11B	+72N	=14N	+59B	+64N	+26B	4.5	16.5	18.5	12.50	2007	+34.2
10	Njuki, Gabriel	1907	KEN	+24B	+3B	+41N	−5N	+42B	−2N	4.0	22.0	25.0	15.00	2092	+29.2
11	Njoroge, Martin	1934	KEN	+9N	+21B	=30B	−3N	+57B	=16N	4.0	21.0	23.5	14.75	1995	+10.2
12	Okonga, Hugh Misiko	1906	KEN	=35N	+29B	+44N	−2B	+61N	=14B	4.0	19.5	22.0	12.75	1875	-1.4
13	Waweru Davidson Mugo	1811	KEN	−2N	+60B	+58N	+36B	+41N	−3B	4.0	19.5	22.0	11.50	1917	+36.0
14	Methu, Joseph Muragu	1966	KEN	+73B	−25N	=9B	+38N	+32B	=12N	4.0	19.0	21.0	13.25	1937	-4.0
15	Mugambi Christian Mwamba	1767	KEN	+22B	−4N	+65B	+76N	=16B	=27N	4.0	19.0	21.0	12.25	1931	+54.4
16	Irungu Brian Mwangi	1971	KEN	−33N	+70B	+20N	+47B	=15N	=11B	4.0	18.5	20.5	13.00	1868	-12.2
17	Wanyoike Collins Mburu	1817	KEN	=31B	−1N	+79B	+65N	=27B	+43N	4.0	18.0	20.0	11.00	1946	+16.6
18	Mwabu, Timothy	1865	KEN	−5B	+56N	+43B	+71N	−3B	+45N	4.0	18.0	20.0	10.50	1880	+5.6
19	Chumba Allan	1897	KEN	+38B	−41B	+50N	+46N	+40B	−4N	4.0	17.5	20.5	12.50	1859	-2.8
20	Chvoro Viacheslav	1753	KEN	−4B	+78N	−16B	+51N	+46B	+71N	4.0	17.0	19.0	10.00	1743	-0.8
21	Achol Agot	1702	KEN	+81B	−11N	+22B	−40N	+56B	+42N	4.0	16.5	18.5	11.50	2058	+88.8
22	Mutuge IanCM	1945	KEN	−15N	+45B	−21N	+72N	+70B	+48B	4.0	16.0	18.0	10.00	1720	-24.4
23	Zachary Muthinji	1765	KEN	−26N	+80B	−3N	+79B	+90N	+47B	4.0	15.5	16.5	8.00	1781	+6.8
24	Kagambi, Samuel	1713	KEN	−10N	+74B	−75N	+53B	+91N	+44B	4.0	14.0	15.0	9.00	1630	-12.8
25	Sang, Ricky	1886	KEN	+39B	+14B	=26N	+30N	−2B	−7B	3.5	21.0	24.5	12.75	1965	+14.4
26	Ngani, Victor	1940	KEN	+23B	+43N	=25B	+31N	−1B	−9N	3.5	21.0	24.0	12.25	1929	-0.2
27	Mayen, Deng, Ador	1886	SSD	+50N	=2B	+61N	−6B	=17N	=15B	3.5	21.0	23.5	12.25	1892	0.0
28	Omondi Suleiman	1870	KEN	=6N	+64B	−1B	+49N	+31B	−30N	3.5	20.0	22.5	11.25	2012	+23.8
29	Oluoch Michael	1831	KEN	=1B	−12N	+78B	+63N	−30B	+40N	3.5	18.5	20.5	10.25	1715	-16.4
30	Kaloki, Hawi	1960	KEN	F	+33B	=11N	−25B	+29N	+28B	3.5	18.0	18.0	12.50	2014	+9.3
31	Magana, BenCM	2024	KEN	=17N	+35B	+47N	−26B	−28N	+62B	3.5	17.5	20.0	11.00	1821	-26.0
32	Elizabeth Cassidy MainaWFM	1833	KEN	−3N	=58B	+74N	+35B	−14N	+59B	3.5	17.5	19.5	9.25	1770	-15.6
33	Kagambi, Lawrence	1804	KEN	+16B	−30N	+88B	+60N	−4B	=58N	3.5	17.5	19.0	9.25	1803	+3.0
34	Fuad Issa	1820	KEN	−41N	+49B	=36N	+62B	−7N	+63B	3.5	16.5	19.0	9.75	1738	-9.6
35	Muli Faraja Mumo	1708	KEN	=12B	−31N	+51B	−32N	+76B	+68N	3.5	16.5	18.5	9.50	1714	-0.8
36	Mathenge Gichuga	1563	KEN	+63B	=81N	=34B	−13N	+73B	=37N	3.5	15.5	17.5	9.00	1815	+61.6
37	Cheruiyot Elly	1750	KEN	=64N	−6B	+67N	=58B	+77N	=36B	3.5	15.5	17.5	8.75	1739	-6.0
38	Riungu Kevin	1697	KEN	−19N	=82B	+92N	−14B	+89N	+66B	3.5	14.0	15.0	6.00	1133	-8.2
39	Ngesa Francis	1632	KEN	−25N	−61B	+82N	+93B	=66N	+73B	3.5	12.5	13.5	6.25	1841	+10.4
40	Geofrey Nyabuto	0	KEN	+77N	+48B	−7N	+21B	−19N	−29B	3.0	19.0	21.0	9.00	1747	0.0
41	Panchol, James Madol	2072	SSD	+34B	+19N	−10B	+48N	−13B	F	3.0	18.5	18.5	10.50	1894	-20.0
42	Simiyu Jerry	1785	KEN	−7N	+76B	+69N	+44B	−10N	−21B	3.0	18.0	20.0	7.50	1616	-39.6
43	Wayne Joe Njarumi	1706	KEN	+8N	−26B	−18N	+92B	+74N	−17B	3.0	18.0	19.0	7.50	1689	-4.0
44	Ongeri Moses Obure	1442	KEN	+68B	+73N	−12B	−42N	+52B	−24N	3.0	16.5	18.5	7.50	1703	+54.8
45	Opiyo Vitalis	1567	KEN	+92N	−22N	+84B	+75B	−8N	−18B	3.0	16.5	17.5	5.00	1715	+21.2
46	Simiyu jimmy	1563	KEN	+54N	−8B	+93N	−19B	−20N	+91B	3.0	16.5	17.5	5.00	1052	-19.6
47	Levi Joshua	1618	KEN	+89N	+87B	−31B	−16N	+60B	−23N	3.0	16.0	17.5	6.00	1608	-8.4
48	Isaac Mwangi	1618	KEN	+79B	−40N	+53B	−41B	+83N	−22N	3.0	15.0	17.0	7.00	1182	-8.4
49	Waweru Trevor Kipngetich	1504	KEN	+55N	−34N	=72B	−28B	=69N	+83B	3.0	14.5	16.5	7.25	1045	-9.2
50	Omani Wycliffe	1636	KEN	−27B	+86N	−19B	+54N	−71B	+80N	3.0	14.5	16.5	7.00	1481	-19.2
51	Gillian Della	0	KEN	=62N	=59B	−35N	−20B	+?N	+70B	3.0	14.5	14.5	4.50	1560	0.0
52	Githiga John	1745	KEN	−75N	+91B	−8N	+67B	−44N	+74B	3.0	14.0	15.0	5.50	953	-56.4
53	Kamau Eric	0	KEN	−70N	+66B	−48N	−24N	+86B	+90B	3.0	13.5	14.5	5.50	1404	0.0
54	Kipchumba Job	0	KEN	−46B	+90N	−70N	−50B	+79N	+77B	3.0	12.0	13.0	5.00	1482	0.0
55	FIDE 554010365	0	—	−49B	+?N	−56B	F	+?N	+95N	3.0	6.5	6.5	0.00	716	0.0
56	Kamau, Hezron Gichuki	1527	KEN	+93N	−18B	+55N	−8B	−21N	=67B	2.5	18.0	19.0	5.25	1024	-19.2
57	Steve Patience	1730	KEN	F	=7B	−6N	+69B	−11N	+61B	2.5	18.0	18.0	7.25	1732	-1.6
58	Anindo Andericus	1560	KEN	+84B	=32N	−13B	=37N	F	=33B	2.5	16.5	18.5	7.25	1714	+27.6
59	Mark Gacheru	1512	KEN	−72B	=51N	+68B	−9N	+65B	−32N	2.5	16.0	18.0	6.50	1623	+14.8
60	Nathaniel Waithaka	1449	KEN	+66N	−13N	+86B	−33B	−47N	=69B	2.5	15.5	17.5	5.75	944	-19.6
61	Nichodemus Koira Karitie	0	KEN	+90B	+39N	−27B	=81N	−12B	−57N	2.5	15.5	16.5	5.50	1697	0.0
62	Jayson Kimani Ndarwa	1604	KEN	=51B	=65N	=63B	−34N	+72B	−31N	2.5	15.0	17.0	6.00	1553	-8.8
63	Andrew Kibiwott Chepkerio	0	KEN	−36N	+77B	=62N	−29B	+88B	−34N	2.5	15.0	16.5	4.75	1592	0.0
64	Shile, Lenny Mataiga	1936	KEN	=37B	−28N	+80B	+88N	−9B	F	2.5	15.0	15.0	5.25	1700	-27.4
65	Nganga Joseph Wairimu	0	KEN	+94N	=62B	−15N	−17B	−59N	+89B	2.5	14.5	15.5	3.75	1352	-56.8
66	Okwiri Dhillo Emmanuel	0	KEN	−60B	−53N	+?B	+78N	=39B	−38N	2.5	14.5	14.5	3.75	1320	0.0
67	Hillary Louise	0	KEN	−88B	+85N	−37B	−52N	+84B	=56N	2.5	13.0	14.5	5.25	1332	0.0
68	Oscar Jesus	0	KEN	−44N	=89B	−59N	+82B	+94N	−35B	2.5	12.5	13.5	3.75	754	0.0
69	Winston Makanga	0	KEN	+?B	=88N	−42B	−57N	=49B	=60N	2.5	12.5	12.5	3.50	1463	0.0
70	Mark Peter Karanja Mwaniki	1585	KEN	+53B	−16N	+54B	−4B	−22N	−51N	2.0	19.0	22.0	6.00	1152	-12.0
71	Kamanda Ryan	1499	KEN	F	+83B	−2N	−18B	+50N	−20B	2.0	18.5	20.5	5.00	1603	+14.0
72	Mburu Alex	0	KEN	+59N	−9B	=49N	−22B	−62N	=82B	2.0	16.5	18.5	5.00	1513	0.0
73	Singe, Philip Mbawala	1794	KEN	−14N	−44B	+89N	+94B	−36N	−39N	2.0	15.5	16.5	2.50	851	-53.2
74	Agape Cherutich Chumba	0	KEN	+?B	−24N	−32B	+87N	−43B	−52N	2.0	15.5	15.5	2.00	950	0.0
75	Brian Gabriel Mwangi	1915	KEN	+52B	−5N	+24B	−45N	F	F	2.0	14.5	14.5	7.00	1788	-12.2
76	Adriel Baraka	1437	KEN	F	−42N	+87B	−15B	−35N	+85N	2.0	14.5	14.5	4.00	953	-16.0
77	Arshavin Thuku	1462	KEN	−40B	−63N	+85B	+84N	−37B	−54N	2.0	14.0	16.0	4.00	950	-7.2
78	Dickson Gitari	0	KEN	+83N	−20B	−29N	−66B	−85N	+93B	2.0	14.0	15.0	3.00	993	0.0
79	FIDE 554010306	0	—	−48N	+95B	−17N	−23N	−54B	+?B	2.0	14.0	14.0	0.00	934	0.0
80	Kayden Sankau Oloitiptip	1414	KEN	+85B	−23N	−64N	−83B	+93N	−50B	2.0	13.5	14.5	3.00	947	-15.2
81	Chitundu Limbikani	1899	KEN	−21N	=36B	+91N	=61B	F	F	2.0	13.5	13.5	4.00	1440	-22.6
82	FIDE 554010373	0	—	F	=38N	−39B	−68N	+?B	=72N	2.0	13.5	13.5	2.75	1472	0.0
83	Stephen Njoroge	0	KEN	−78B	−71N	+?B	+80N	−48B	−49N	2.0	12.0	12.0	2.00	1315	0.0
84	FIDE 554007658	0	—	−58N	+94B	−45N	−77B	−67N	+92B	2.0	11.0	12.0	2.00	737	0.0
85	Ralph Royford Muthomi	0	KEN	−80N	−67B	−77N	+?N	+78B	−76B	2.0	10.5	10.5	2.00	644	0.0
86	FIDE 554010381	0	—	+95N	−50B	−60N	−91B	−53N	+94B	2.0	10.5	10.5	1.00	757	0.0
87	FIDE 10876383	0	—	+?B	−47N	−76N	−74B	+92N	F	2.0	9.5	9.5	1.00	728	0.0
88	Chemnjor, Gideon Kirwa	1594	KEN	+67N	=69B	−33N	−64B	−63N	F	1.5	13.5	15.5	3.75	1070	-14.0
89	FIDE 10898344	0	—	−47B	=68N	−73B	+?N	−38B	−65N	1.5	13.5	13.5	1.25	892	0.0
90	Maiyani Oloitiptip Trevor	1473	KEN	−61N	−54B	+95N	F	−23B	−53N	1.0	15.5	15.5	0.00	965	-6.0
91	FIDE 554010284	0	—	F	−52N	−81B	+86N	−24B	−46N	1.0	14.0	14.0	2.00	930	0.0
92	FIDE 554010330	0	—	−45B	+?N	−38B	−43N	−87B	−84N	1.0	13.5	13.5	0.00	857	0.0
93	FIDE 10898298	0	—	−56B	+?N	−46B	−39N	−80B	−78N	1.0	13.0	13.0	0.00	733	0.0
94	FIDE 10898166	0	—	−65B	−84N	+?B	−73N	−68B	−86N	1.0	11.0	11.0	0.00	926	0.0
95	FIDE 554010403	0	—	−86B	−79N	−90B	F	F	−55B	0.0	8.0	8.0	0.00	673	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Achol AgotKEN
+88.8
4.0 pts · #9
2Mathenge GichugaKEN
+61.6
3.5 pts · #35
3Ongeri Moses ObureKEN
+54.8
3.0 pts · #42

Top rating losers

1Nganga Joseph WairimuKEN
-56.8
2.5 pts · #63
2Githiga JohnKEN
-56.4
3.0 pts · #80
3Singe, Philip MbawalaKEN
-53.2
2.0 pts · #78

Biggest upsets

R2+352 Elo gap
Ongeri Moses Obure1442 beat Singe, Philip Mbawala1794
R4+348 Elo gap
Opiyo Vitalis1567 beat Brian Gabriel Mwangi1915
R5+303 Elo gap
Ongeri Moses Obure1442 beat Githiga John1745