Sapporo Summer Chess Open
7 players participated in this 5-round tournament, held from 27 Jun 2026 to 28 Jun 2026 in Sapporo, Japan. 3 federations represented. Top 10 Elo average was 1769, and top seed was Maciej Dryglas (🇯🇵 JPN, 2099).
David Zion Chiu (🇭🇰 HKG, 1915) won with 4.0/5, ahead of Maciej Dryglas (3.0) and Shyun Fwu Aldrin Wong (2.5). Chiu shared the lead from round 4 and broke clear in the final round.
The biggest upset came in round 1: Shyun Fwu Aldrin Wong (1577) beat David Zion Chiu (1915), a +338-point gap.
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How it unfolded
Top 6 · 5 roundsDavid Zion Chiu led from R5; +1.0-point edge over the runner-up. Title race converged from 2 co-leaders at R4 to 1 by R5.
David Zion Chiu takes the sole lead (4.0/5).
David Zion Chiu beat Maciej Dryglas (White).
David Zion Chiu won 4 in a row (R2–R5).
Key matchups · top 4
Head-to-head between the four finishers| Player | 1 | 2 | 3 | 4 |
|---|---|---|---|---|
| 1David Zion Chiu | * | 1 | — | 0 |
| 2Maciej Dryglas | 0 | * | 1 | 1 |
| 3Silas Nathaniel Chiu | — | 0 | * | ½ |
| 4Shyun Fwu Aldrin Wong | 1 | 0 | ½ | * |
Grille américaine
| # | Player | Elo | Fed | R1 | R2 | R3 | R4 | R5 | Pts | Bu C1 | Bu | SB | Perf | Δ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Chiu, David Zion | 1915 | HKG | −3N | +7B | +6N | +5B | +2B | 4.0 | 8.0 | 8.5 | 6.00 | 1980 | +20.0 |
| 2 | Dryglas, Maciej | 2099 | JPN | +7B | −5N | +3B | +4B | −1N | 3.0 | 10.5 | 11.0 | 5.50 | 1842 | -26.6 |
| 3 | Wong, Shyun Fwu Aldrin | 1577 | SGP | +1B | =4B | −2N | F | +6N | 2.5 | 10.5 | 10.5 | 6.25 | 1897 | +30.2 |
| 4 | Chiu, Silas Nathaniel | 1765 | HKG | +6B | =3N | +5B | −2N | F | 2.5 | 8.0 | 8.0 | 3.75 | 1843 | +14.8 |
| 5 | Takashima, Bunji | 1763 | JPN | F | +2B | −4N | −1N | =7B | 1.5 | 10.0 | 10.0 | 3.25 | 1785 | +0.2 |
| 6 | Horie, Ryosuke | 1552 | JPN | −4N | F | −1B | +7N | −3B | 1.0 | 9.5 | 9.5 | 0.50 | 1549 | -1.8 |
| 7 | Akai, Kiyotaka | 1710 | JPN | −2N | −1N | F | −6B | =5N | 0.5 | 9.5 | 9.5 | 0.75 | 1510 | -19.4 |
Key insights
Biggest movers and upsets — the story behind the numbers.
- 1Wong, Shyun Fwu AldrinSGP+30.22.5 pts · #4
- 2Chiu, David ZionHKG+20.04.0 pts · #1
- 3Chiu, Silas NathanielHKG+14.82.5 pts · #3
- 1Dryglas, MaciejJPN-26.63.0 pts · #2
- 2Akai, KiyotakaJPN-19.40.5 pts · #7
- 3Horie, RyosukeJPN-1.81.0 pts · #6
- R1+338 Elo gap
- R2+336 Elo gap
- R5+184 Elo gap