2025 Hamilton Halloween Open
Open SwissStandard
28 players participated in this 5-round tournament, held from 01 Nov 2025 to 02 Nov 2025 in Hamilton, Canada. 3 titled players from 5 federations. Top 10 Elo average was 0.
Pierre J Vachon (🇺🇸 USA, 0) won with 4.5/5, ahead of Oscar Cheung (4.0) and Calix Marchand (4.0). Vachon won solo starting round 4.
Location
🇨🇦Hamilton, Canada
Dates
01 Nov 2025 → 02 Nov 2025
Time control
Standard: 60 minutes with 30 seconds increment from move 1
System
Swiss · 5 rounds
Avg top 10
0
Participants
28
Titled players · 3
FM×1
CM×1
WCM×1
Federations · 5 represented
🇨🇦Canada×22
🇺🇸United States of America×2
🇮🇳India×1
🇻🇳Vietnam×1
🇵🇭Philippines×1
Top 3
- 🥇
- 🥈
- 🥉
How it unfolded
Top 6 · 5 roundsPierre J Vachon led from R4; +0.5-point edge over the runner-up.
Co-leaders
11
4
2
1
1
R4–R5 · LEAD HELD
Pierre J Vachon held the sole lead from R4 through R5 without losing it.
R5 · HEAD-TO-HEAD · WINNER VS 2ND
Pierre J Vachon drew with Oscar Cheung (Black).
R1–R4 · WIN STREAK
Pierre J Vachon won 4 in a row (R1–R4).
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1Pierre J Vachon | * | ½ | 1 | 1 |
| 2Oscar Cheung | ½ | * | — | — |
| 3Malhar Singh | 0 | — | * | — |
| 4FMCalix Marchand | 0 | — | — | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Vachon, Pierre J | 0 | USA | +19N | +24B | +4N | +3B | =2N | 4.5 | 13.5 | 14.5 | 12.50 | 2180 | +53.6 |
| 2 | Cheung, Oscar | 0 | CAN | +6N | =10B | +12N | +11B | =1B | 4.0 | 12.5 | 15.0 | 11.50 | 2083 | +94.0 |
| 3 | Marchand, CalixFM | 0 | CAN | +18B | +22N | +5B | −1N | +8B | 4.0 | 12.0 | 13.0 | 8.50 | 1981 | -20.8 |
| 4 | Singh, Malhar | 0 | CAN | +27B | +16N | −1B | +14N | +5B | 4.0 | 12.0 | 12.5 | 8.00 | 2086 | +30.6 |
| 5 | Li, Aiden | 0 | CAN | +23N | +13B | −3N | +7B | −4N | 3.0 | 13.5 | 14.5 | 6.50 | 1885 | +22.4 |
| 6 | Trofimov-Malyshkin, Valent | 0 | CAN | −2B | +15N | =7N | +21B | =11N | 3.0 | 12.0 | 13.5 | 6.75 | 1803 | -19.6 |
| 7 | Chen, ShuangWCM | 0 | CAN | +9B | =14N | =6B | −5N | +25B | 3.0 | 11.5 | 12.5 | 6.75 | 1980 | +52.8 |
| 8 | Catubig, Florencio | 0 | PHI | −13N | +23N | +22B | +10B | −3N | 3.0 | 10.0 | 11.0 | 4.50 | 1898 | 0.0 |
| 9 | Dembla, Shabd | 0 | CAN | −7N | =27B | +20N | +18B | =12B | 3.0 | 8.5 | 9.0 | 4.50 | 1801 | -13.6 |
| 10 | Li, Hongyi | 0 | CAN | +15B | =2N | −11B | −8N | +20B | 2.5 | 12.0 | 13.5 | 6.00 | 1827 | -0.2 |
| 11 | Sherman, Joshua | 0 | CAN | F | +17B | +10N | −2N | =6B | 2.5 | 11.5 | 11.5 | 6.00 | 1897 | +19.2 |
| 12 | Sheth, Rudra | 0 | CAN | F | +20N | −2B | +13B | =9N | 2.5 | 11.0 | 11.0 | 5.50 | 1774 | +6.4 |
| 13 | Cheng, Jacob | 0 | CAN | +8B | −5N | =18B | −12N | +19B | 2.5 | 10.0 | 11.5 | 5.25 | 1632 | 0.0 |
| 14 | Lai, Duc Minh | 0 | VIE | F | =7B | +24N | −4B | +16N | 2.5 | 10.0 | 10.0 | 4.50 | 1882 | -22.8 |
| 15 | Niketic, Vukan | 0 | CAN | −10N | −6B | +28N | +22B | =17N | 2.5 | 8.5 | 8.5 | 2.00 | 1703 | +7.6 |
| 16 | Husic, Elvis | 0 | CAN | +25B | −4B | =21N | =19N | −14B | 2.0 | 9.5 | 10.5 | 2.50 | 1750 | +20.0 |
| 17 | McDonald-Johnston, Ari | 0 | CAN | =20B | −11N | F | +27N | =15B | 2.0 | 7.0 | 7.0 | 2.50 | 1734 | +7.2 |
| 18 | Patil, Tanishq | 0 | CAN | −3N | +28B | =13N | −9N | −21B | 1.5 | 11.0 | 11.0 | 1.25 | 1093 | -34.0 |
| 19 | Sama, Chetan Reddy | 0 | CAN | −1B | −26N | +27N | =16B | −13N | 1.5 | 10.0 | 10.5 | 1.50 | 1757 | +3.6 |
| 20 | Fillmore, Louis | 0 | CAN | =17N | −12B | −9B | +28N | −10N | 1.5 | 10.0 | 10.0 | 1.00 | 1446 | -58.0 |
| 21 | Belanger, Colton | 0 | CAN | F | F | =16B | −6N | +18N | 1.5 | 6.5 | 6.5 | 2.50 | 1777 | +7.6 |
| 22 | Syed, Farhaan | 0 | USA | +28B | −3B | −8N | −15N | −23B | 1.0 | 10.5 | 10.5 | 0.00 | 1040 | -36.4 |
| 23 | Chauhan, Kshitij | 0 | CAN | −5B | −8B | F | −25N | +22N | 1.0 | 8.0 | 8.0 | 1.00 | 1613 | -31.2 |
| 24 | Param Agarwal | 0 | IND | +26B | −1N | −14B | F | F | 1.0 | 8.0 | 8.0 | 1.00 | 1900 | +12.8 |
| 25 | Brajkovic, Nikola | 0 | CAN | −16N | F | F | +23B | −7N | 1.0 | 6.0 | 6.0 | 1.00 | 1618 | -13.6 |
| 26 | Terry, JoshuaCM | 0 | CAN | −24N | +19B | F | F | F | 1.0 | 2.5 | 2.5 | 1.50 | 1699 | -16.4 |
| 27 | Li, Allen | 0 | CAN | −4N | =9N | −19B | −17B | F | 0.5 | 10.5 | 10.5 | 1.50 | 1452 | -48.4 |
| 28 | FIDE 2656361 | 0 | — | −22N | −18N | −15B | −20B | F | 0.0 | 6.5 | 6.5 | 0.00 | 894 | 0.0 |
Key insights
Biggest movers and upsets — the story behind the numbers.
Top rating gainers
- 1Cheung, OscarCAN+94.04.0 pts · #2
- 2Vachon, Pierre JUSA+53.64.5 pts · #1
- 3Chen, ShuangWCMCAN+52.83.0 pts · #6
Top rating losers
- 1Fillmore, LouisCAN-58.01.5 pts · #25
- 2Li, AllenCAN-48.40.5 pts · #24
- 3Syed, FarhaanUSA-36.41.0 pts · #27