15th Annual World Open Senior Amateur

Open SwissStandard

45 players participated in this 5-round tournament, held from 30 Jun 2025 to 01 Jul 2025 in Philadelphia, PA, United States. 1 titled players from 2 federations. Top 10 Elo average was 1929, and top seed was Herb Carswell (🇺🇸 USA, 2070).

Karl Dehmelt (🇺🇸 USA, FM, 2054) won with 4.5/5, ahead of Herb Carswell (4.5) and Upadhyay R (4.0). Dehmelt shared the lead from round 4, winning on tie-break.

The biggest upset came in round 2: Preston Ladson (1674) beat Rene Phillips (1904), a +230-point gap.

Location

🇺🇸Philadelphia, PA, United States

Dates

30 Jun 2025 → 01 Jul 2025

Time control

Standard: All Moves in 90 Min. Del. 10 Sec. / /

System

Swiss · 5 rounds

Top seed

🇺🇸Herb Carswell2070

Avg top 10

1,929

Participants

Titled players · 1

FM×1

Federations · 2 represented

🇺🇸United States of America×33

🇮🇳India×1

Top 3

🥇
FMKarl Dehmelt
🇺🇸USA·2054
4.5pts·2129perf+5.2
🥈
Herb Carswell
🇺🇸USA·2070
4.5pts·2534perf+20.0
🥉
Upadhyay R
🇮🇳IND·1913
4.0pts·2087perf+18.0

How it unfolded

Top 6 · 5 rounds

Tight race until R5; 2 players tied at 4.5/5, decided on Buchholz. Title race narrowed from 4 co-leaders at R4 to 2 at the finish.

Co-leaders

Carswell4.5Dehmelt4.5Upadhyay4Mitchell3.5Hill3.5Nolan3.5— ex-leaders:Realed R3, #16

R5 · TIEBREAK CLUSTER

2 players finish on 4.5/5. Dehmelt takes the title on Buchholz Cut1 (13.0).

R3–R5 · WIN STREAK

Herb Carswell won 3 in a row (R3–R5).

R3 · FORMER LEADER FALL

Andrew Rea held the sole lead at R3 but finished #16.

Grille américaine

#	Player	Elo	Fed	R1	R2	R3	R4	R5	Pts	Bu C1	Bu	SB	Perf	Δ
1	Dehmelt, KarlFM	2054	USA	+23N	+13B	=6N	+11B	+4N	4.5	13.0	15.0	13.25	2129	+5.2
2	Carswell, Herb	2070	USA	+26B	=18N	+7B	+27N	+5B	4.5	11.5	13.5	12.25	2534	+20.0
3	Upadhyay R	1913	IND	+34N	+8B	−4B	+24N	+12N	4.0	12.0	13.0	9.50	2087	+18.0
4	Rea, Andrew	1901	USA	+35N	+29B	+3N	=12B	−1B	3.5	13.5	14.5	8.50	1952	+4.0
5	Nolan, Gregory	1820	USA	+31N	+40B	=11N	+6B	−2N	3.5	13.0	14.0	8.00	1890	+7.0
6	Sharp, Dale Eugene	1826	USA	+25B	+28N	=1B	−5N	+18B	3.5	12.5	14.5	8.75	1744	-4.4
7	Montalti, Gianluca	1698	USA	+39N	=10B	−2N	+25B	+21N	3.5	12.5	13.5	7.25	1800	+6.4
8	Colding, Ernest	1917	USA	+32B	−3N	+19B	+29N	=9B	3.5	12.0	14.0	8.25	1808	-8.4
9	Hill, Leroy	1819	USA	+30B	=19N	=24B	+28N	=8N	3.5	10.0	12.0	8.00	1824	+2.4
10	Mitchell, Arthur D	1806	USA	+37B	=7N	F	+23B	+13N	3.5	9.5	9.5	7.75	2010	+28.4
11	Ladson, Preston	1674	USA	+38B	+14N	=5B	−1N	=15N	3.0	14.0	15.0	7.25	1907	+22.6
12	Carey, Michael	1889	USA	=20B	+45N	+18B	=4N	−3B	3.0	12.5	12.5	5.50	1732	-12.6
13	Larsen, James	1771	USA	+36B	−1N	+37B	+14N	−10B	3.0	12.0	13.0	5.00	1877	+21.2
14	Phillips, Rene	1904	USA	+42N	−11B	+16N	−13B	+26N	3.0	11.0	11.5	5.50	1586	-49.6
15	Kline, Edmund G	1850	USA	=21N	+20B	F	+19N	=11B	3.0	10.5	10.5	7.75	1856	+2.4
16	Kutikoff, Bruce	0	USA	−24B	+36N	−14B	+31N	+23N	3.0	9.0	10.0	5.00	1086	-13.2
17	Karell, Leif	1705	USA	−19B	=25N	+43B	+20N	=27B	3.0	9.0	9.0	4.50	1782	+8.0
18	Wotschka, Marco	0	USA	+22N	=2B	−12N	+34B	−6N	2.5	13.5	14.5	5.75	1655	0.0
19	Coski, Christopher	1693	USA	+17N	=9B	−8N	−15B	+38B	2.5	13.0	14.0	5.75	1736	+7.2
20	Conner, Stephen J	1758	USA	=12N	−15N	+22B	−17B	+34N	2.5	11.5	12.5	5.00	1542	-30.4
21	Kula, John Scott	1525	USA	=15B	−41N	+42N	+40B	−7B	2.5	8.5	9.0	3.00	1683	+25.6
22	FIDE 39901556	0	—	−18B	=42B	−20N	+36N	+35B	2.5	7.0	7.5	2.25	958	0.0
23	Elovic, Elie	0	USA	−1B	+30N	+31B	−10N	−16B	2.0	13.0	15.0	4.00	1641	0.0
24	Lawson, Brian	1869	USA	+16N	=27B	=9N	−3B	F	2.0	12.5	12.5	5.75	1695	-14.0
25	Bellia, Robert	0	USA	−6N	=17B	+45B	−7N	=33B	2.0	11.5	11.5	2.25	1470	0.0
26	Batezel, Clifford	1689	USA	−2N	+33B	−29N	+39B	−14B	2.0	11.0	12.0	2.50	1187	-12.8
27	Trueman, William R	1729	USA	F	=24N	+41B	−2B	=17N	2.0	10.5	10.5	3.50	1891	+31.6
28	FIDE 30905834	0	—	+33N	−6B	+35N	−9B	F	2.0	9.5	9.5	2.50	1023	0.0
29	Knatz, Michael J	0	USA	+43N	−4N	+26B	−8B	F	2.0	9.0	9.0	2.00	1769	0.0
30	Karell, Mira	1438	USA	−9N	−23B	+44N	+35B	−32N	2.0	8.5	8.5	1.00	1019	-3.6
31	FIDE 39984303	0	—	−5B	+44N	−23N	−16B	+43B	2.0	8.5	8.5	0.00	1694	0.0
32	Rogers, Lamont E	0	USA	−8N	−34B	F	+43N	+30B	2.0	6.5	6.5	2.00	1661	0.0
33	FIDE 39985695	0	—	−28B	−26N	F	+44B	=25N	1.5	6.0	6.0	1.00	889	0.0
34	FIDE 39985598	0	—	−3B	+32N	F	−18N	−20B	1.0	11.0	11.0	2.00	1036	0.0
35	Neal, Richard	0	USA	−4B	+38N	−28B	−30N	−22N	1.0	10.0	11.0	1.00	870	0.0
36	FIDE 39982653	0	—	−13N	−16B	F	−22B	+44N	1.0	8.5	8.5	0.00	971	0.0
37	Holcomb, David D	1742	USA	−10N	+39B	−13N	F	F	1.0	7.5	7.5	1.00	989	-34.8
38	FIDE 39900886	0	—	−11N	−35B	F	+42B	−19N	1.0	7.0	7.0	0.50	884	0.0
39	FIDE 39900789	0	—	−7B	−37N	F	−26N	+45B	1.0	6.5	6.5	0.00	910	0.0
40	Zelinski, Paul B	1611	USA	+44B	−5N	F	−21N	F	1.0	6.0	6.0	0.00	873	-17.0
41	Thomas, Kenneth	1920	USA	F	+21B	−27N	F	F	1.0	4.5	4.5	2.50	1627	-13.4
42	FIDE 39901289	0	—	−14B	=22N	−21B	−38N	F	0.5	9.0	9.0	1.25	915	0.0
43	Sankar, Swaminathan	1568	USA	−29B	F	−17N	−32B	−31N	0.0	9.0	9.0	0.00	905	-12.8
44	FIDE 39984966	0	—	−40N	−31B	−30B	−33N	−36B	0.0	6.5	7.5	0.00	725	0.0
45	FIDE 39982742	0	—	F	−12B	−25N	F	−39N	0.0	6.0	6.0	0.00	1089	0.0

Key insights

Biggest movers and upsets — the story behind the numbers.

Top rating gainers

1Trueman, William RUSA
+31.6
2.0 pts · #9
2Mitchell, Arthur DUSA
+28.4
3.5 pts · #5
3Kula, John ScottUSA
+25.6
2.5 pts · #17

Top rating losers

1Phillips, ReneUSA
-49.6
3.0 pts · #21
2Holcomb, David DUSA
-34.8
1.0 pts · #35
3Conner, Stephen JUSA
-30.4
2.5 pts · #25

Biggest upsets

R2+230 Elo gap
Ladson, Preston1674 beat Phillips, Rene1904
R3+191 Elo gap
Trueman, William R1729 beat Thomas, Kenneth1920
R4+133 Elo gap
Larsen, James1771 beat Phillips, Rene1904