Open MAI 2026

Open SwissStandard

42 players participated in this 7-round tournament, held from 29 May 2026 to 31 May 2026 in Nouakchott, Mauritania. Top 10 Elo average was 1693, and top seed was Ahmed cherif Khaled Abdellahi (🇲🇷 MTN, 1949).

Taher El Moustapha (🇲🇷 MTN, 1773) won with 6.5/7, ahead of Ahmed cherif Khaled Abdellahi (6.0). Moustapha won solo starting round 6.

The biggest upset came in round 6: Taher El Moustapha (1773) beat Ahmed cherif Khaled Abdellahi (1949), a +176-point gap.

Location

🇲🇷Nouakchott, Mauritania

Dates

29 May 2026 → 31 May 2026

Time control

Standard: 60 minutes with 30 seconds increment from move 1

System

Swiss · 7 rounds

Top seed

🇲🇷Ahmed cherif Khaled Abdellahi1949

Avg top 10

1,693

Participants

Federations · 1 represented

🇲🇷Mauritania×18

Top 3

🥇
Taher El Moustapha
🇲🇷MTN·1773
6.5pts·2587perf+31.2
🥈
Ahmed cherif Khaled Abdellahi
🇲🇷MTN·1949
6.0pts·1883perf-9.2
🥉
FIDE 19611935
—
5.5pts·1682perf0.0

How it unfolded

Top 6 · 7 rounds

Taher El Moustapha led from R6; +0.5-point edge over the runner-up. Title race converged from 3 co-leaders at R4 to 1 by R6.

Co-leaders

Moustapha6.5Abdellahi65.5Idi5Kbeid5Navea5

R6–R7 · LEAD HELD

Taher El Moustapha held the sole lead from R6 through R7 without losing it.

R6 · HEAD-TO-HEAD · WINNER VS 2ND

Taher El Moustapha beat Ahmed cherif Khaled Abdellahi (White).

WIN STREAKS · 3 top finishers

Taher El Moustapha 6 wins (R1–R6)Ahmed cherif Khaled Abdellahi 5 wins (R1–R5)FIDE 19611935 4 wins (R3–R6)

Key matchups · top 4

Head-to-head between the four finishers

Player	1	2	3	4
1Taher El Moustapha	*	1	½	—
2Ahmed cherif Khaled Abdellahi	0	*	—	1
3FIDE 19611935	½	—	*	—
4Abdalahi Sidi Mohamed Idi	—	0	—	*

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	R6	R7	Pts	Bu C1	Bu	SB	Perf	Δ
1	Taher El Moustapha	1773	MTN	+29B	+13N	+12B	+4N	+20B	+2B	=3N	6.5	28.0	30.0	27.25	2587	+31.2
2	Ahmed cherif Khaled Abdellahi	1949	MTN	+23B	+22N	+5B	+6N	+7B	−1N	+10B	6.0	29.0	32.5	26.00	1883	-9.2
3	FIDE 19611935	0	—	+?N	−14B	+?N	+24B	+19N	+5N	=1B	5.5	22.0	22.0	14.75	1682	0.0
4	Mohamed Salem Kbeid	1806	MTN	+41N	+8B	+9N	−1B	F	+7N	+6B	5.0	29.0	29.0	18.50	1855	+10.4
5	Adnan Dede Sid Navea	1621	MTN	+26N	+27B	−2N	+32B	+16N	−3B	+13N	5.0	24.5	26.5	15.00	1767	+12.8
6	Abdalahi Sidi Mohamed Idi	1721	MTN	+36N	+38B	+16N	−2B	+15N	+9B	−4N	5.0	24.5	25.5	14.50	1758	+11.2
7	Abdellahi Dedach	1539	MTN	+21N	+31B	+14N	+19B	−2N	−4B	=8N	4.5	26.5	28.5	15.25	1750	+38.8
8	Ahmedou Sidi Mohamed Taleb	0	MTN	+?B	−4N	−21B	+22N	+18B	+12N	=7B	4.5	24.5	24.5	13.75	1621	0.0
9	Mohamed Abdel Hay Baba	1613	MTN	+28B	+33N	−4B	+18N	+13B	−6N	=23B	4.5	23.5	25.5	13.75	964	-12.0
10	FIDE 19612575	0	—	−19N	+41B	+34N	=27B	+32N	+20B	−2N	4.5	18.0	18.0	7.50	964	0.0
11	Cheikh Brahim Mohamed El Moctar	1579	MTN	−27N	+35B	−19N	+30B	+26N	+25B	=21B	4.5	17.0	18.0	10.75	778	-20.0
12	Mohamed Mohamed	1606	MTN	+35N	+24B	−1N	+25B	F	−8B	+20N	4.0	25.5	26.5	10.50	973	-11.2
13	Ahmed Aba	0	MTN	+?N	−1B	+30N	+21B	−9N	+29B	−5B	4.0	23.5	23.5	7.50	869	0.0
14	Abderrahmane Tolba	1676	MTN	+18B	+3N	−7B	−20N	F	+28N	+19B	4.0	23.0	25.0	15.00	1559	-6.2
15	Bouchra Abbe	1477	MTN	+30B	+40N	−20B	+17N	−6B	−21N	+24B	4.0	21.0	21.0	9.00	921	-8.0
16	Mohamed Dedach	1585	MTN	+42B	+39N	−6B	+28N	−5B	−23N	+35B	4.0	17.5	17.5	4.00	871	-30.8
17	FIDE 19613032	0	—	+25N	−34B	+26N	−15B	−22N	+36B	+29N	4.0	16.5	17.5	9.00	664	0.0
18	Mohamed El Hacen	0	MTN	−14N	+?B	+?N	−9B	−8N	+37B	+31N	4.0	16.0	16.0	3.00	845	0.0
19	Ahmedou Moutaly	1578	MTN	+10B	=20N	+11B	−7N	−3B	+22B	−14N	3.5	26.5	30.0	14.25	1561	-3.6
20	FIDE 19608985	0	—	+?N	=19B	+15N	+14B	−1N	−10N	−12B	3.5	26.5	26.5	9.75	1622	0.0
21	FIDE 19612885	0	—	−7B	F	+8N	−13N	+?B	+15B	=11N	3.5	21.5	21.5	10.75	1532	0.0
22	Fatma Vall Abdel Malick	1451	MTN	+37N	−2B	=27N	−8B	+17B	−19N	+34B	3.5	21.0	22.0	7.00	915	-16.4
23	FIDE 19606435	0	—	−2N	−?B	+35N	+?B	F	+16B	=9N	3.5	18.5	18.5	7.25	1716	0.0
24	FIDE 19613016	0	—	+?B	−12N	+33B	−3N	F	+26B	−15N	3.0	22.0	22.0	5.00	742	0.0
25	FIDE 19612877	0	—	−17B	+42N	+40B	−12N	+28B	−11N	−30B	3.0	16.5	16.5	2.00	793	0.0
26	FIDE 19613024	0	—	−5B	+?N	−17B	+40N	−11B	−24N	+?B	3.0	16.5	16.5	0.00	800	0.0
27	FIDE 19612052	0	—	+11B	−5N	=22B	=10N	F	F	F	2.0	19.5	20.5	8.50	1550	0.0
28	FIDE 19609957	0	—	−9N	+?B	+31N	−16B	−25N	−14B	−32N	2.0	19.5	19.5	2.00	825	0.0
29	FIDE 19613067	0	—	−1N	−?B	+37N	+?B	F	−13N	−17B	2.0	19.5	19.5	1.00	973	0.0
30	FIDE 19612915	0	—	−15N	F	−13B	−11N	F	+32B	+25N	2.0	18.5	18.5	5.00	728	0.0
31	FIDE 19612893	0	—	+32B	−7N	−28B	+36N	F	F	−18B	2.0	16.5	17.5	3.00	739	0.0
32	FIDE 19612060	0	—	−31N	+37B	F	−5N	−10B	−30N	+28B	2.0	16.5	16.5	3.00	821	0.0
33	FIDE 19610068	0	—	+?N	−9B	−24N	+?B	F	F	F	2.0	11.5	11.5	0.00	813	0.0
34	FIDE 19612990	0	—	−39B	+17N	−10B	F	F	F	−22N	1.0	17.0	17.0	4.00	651	0.0
35	Haddou Abdel Wedoud	0	MTN	−12B	−11N	−23B	F	F	+?N	−16N	1.0	16.0	16.0	0.00	790	0.0
36	FIDE 19613059	0	—	−6B	F	+?N	−31B	F	−17N	−?B	1.0	13.0	13.0	0.00	921	0.0
37	FIDE 19609981	0	—	−22B	−32N	−29B	F	F	−18N	+?B	1.0	11.5	11.5	0.00	651	0.0
38	FIDE 19606559	0	—	+?B	−6N	F	F	F	F	F	1.0	9.0	9.0	0.00	921	0.0
39	FIDE 19611382	0	—	+34N	−16B	F	F	F	F	F	1.0	7.0	7.0	1.00	785	0.0
40	FIDE 19611889	0	—	F	−15B	−25N	−26B	F	F	F	0.0	12.0	12.0	0.00	677	0.0
41	FIDE 19609434	0	—	−4B	−10N	F	F	F	F	F	0.0	10.5	10.5	0.00	1006	0.0
42	FIDE 19611668	0	—	−16N	−25B	−?N	−?B	F	−?N	F	0.0	7.0	7.0	0.00	785	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Abdellahi DedachMTN
+38.8
4.5 pts · #8
2Taher El MoustaphaMTN
+31.2
6.5 pts · #3
3Adnan Dede Sid NaveaMTN
+12.8
5.0 pts · #14

Top rating losers

1Mohamed DedachMTN
-30.8
4.0 pts · #40
2Cheikh Brahim Mohamed El MoctarMTN
-20.0
4.5 pts · #33
3Fatma Vall Abdel MalickMTN
-16.4
3.5 pts · #29

Biggest upsets

R6+176 Elo gap
Taher El Moustapha1773 beat Ahmed cherif Khaled Abdellahi1949
R3+137 Elo gap
Abdellahi Dedach1539 beat Abderrahmane Tolba1676