CHANG Ziwen · RDFZ BRIDGE STRAIT
vs par split: bidding +0.09 · play +0.22
Strength of schedule: opponents averaged +0.38/bd (a tough draw) → opponent-adjusted -0.95/bd
Card play — on target: opening leads 90.0% #14 of 78 · declarer play 50.0% #67 of 78 · defence 89.5% #10 of 78
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 100.0% (1) | 88.9% (9) |
| Declarer play | 0.0% (1) | 66.7% (3) |
| Defence | 100.0% (5) | 85.7% (14) |
Opening leads by suit led: ♠ 100.0% (1) · ♥ 100.0% (2) · ♦ 50.0% (2) · ♣ 100.0% (5)
vs par by strain: NT +0.00 (10) · a suit +0.46 (22)
vs par by level: part-score -0.54 (13) · game +0.94 (18) · slam +0.00 (1)
By role: declaring -1.08/bd (-2.92 vs par · 13) · defending -1.50/bd (+2.53 vs par · 19)
By vulnerability: vulnerable -1.91/bd (-0.88 vs par · 16) · not vulnerable -0.74/bd (+1.50 vs par · 16)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round 1 | Z.Sun | M.Ren – X.Yu | Closed | 8 | +4.4 | +0.55 | +3.50 |
| Round 4 | Z.Sun | J.Bakhshi – M.Bertheau | Open | 8 | -10.1 | -1.26 | -2.75 |
| Round 5 | Z.Sun | Y.Fu – Z.Gao | Open | 8 | -15.6 | -1.95 | +0.88 |
| Round 8 | Z.Sun | S.Li – X.Zhang | Open | 8 | -21.2 | -2.65 | -0.38 |
Every board — best Butler first↑ top
vs par = IMPs this pair scored above (+) or below (−) the board’s double-dummy par — what bidding and play (theirs and the opponents’) added or gave away against perfect play.
| Butler | Round | Opponents | Bd | Contract | Lead | Res | vs par |
|---|---|---|---|---|---|---|---|
| +7.2 | Round 8 | SXSATURN | 31 | 4♠ | ♥5 | -1 | +12 |
| +4.8 | Round 1 | CHINA RDFZ HOPE | 3 | 3NT | ♣J | +1 | +7 |
| +4.8 | Round 1 | CHINA RDFZ HOPE | 5 | 3♥ | ♣4 | -1 | +5 |
| +4.2 | Round 1 | CHINA RDFZ HOPE | 2 | 4♥ | ♣5 | +2 | +11 |
| +2.5 | Round 5 | SXMARS | 1 | 1♠ | ♦3 | +1 | +0 |
| +2.2 | Round 1 | CHINA RDFZ HOPE | 1 | 4♠ | ♦3 | -2 | +0 |
| +1.9 | Round 4 | SHARKS | 25 | 3♥ | ♠5 | = | +0 |
| +1.8 | Round 4 | SHARKS | 26 | 3♥ | ♦6 | -1 | +0 |
| +1.0 | Round 4 | SHARKS | 27 | 4♥ | ♦K | = | +0 |
| +1.0 | Round 5 | SXMARS | 3 | 3NT | ♣J | +3 | +14 |
| +0.8 | Round 1 | CHINA RDFZ HOPE | 8 | 5♦ | ♠4 | -2 | +5 |
| +0.7 | Round 4 | SHARKS | 28 | 2♠ | ♥2 | +1 | +0 |
| +0.3 | Round 1 | CHINA RDFZ HOPE | 6 | 3♦ | ♣5 | +1 | +10 |
| +0.2 | Round 8 | SXSATURN | 25 | 5♠ | ♥A | = | +0 |
| -1.2 | Round 4 | SHARKS | 30 | 3NT | ♣4 | = | +2 |
| -1.2 | Round 8 | SXSATURN | 27 | 1NT | ♥6 | -2 | +1 |
| -1.2 | Round 8 | SXSATURN | 29 | 2♠ | ♣3 | +1 | +10 |
| -1.4 | Round 8 | SXSATURN | 30 | 4♠ | ♦6 | = | -3 |
| -1.8 | Round 5 | SXMARS | 2 | 3♥ | ♦A | -1 | +2 |
| -1.9 | Round 5 | SXMARS | 6 | 3NT | ♦6 | +1 | +11 |
| -2.6 | Round 5 | SXMARS | 7 | 3NT | ♠6 | -2 | -7 |
| -3.3 | Round 5 | SXMARS | 4 | 1NT | ♣5 | -1 | -5 |
| -3.3 | Round 5 | SXMARS | 8 | 4♥ | ♣10 | = | -8 |
| -4.5 | Round 4 | SHARKS | 31 | 4♠ | ♣10 | +1 | +0 |
| -4.6 | Round 4 | SHARKS | 32 | 2NT | ♥6 | -1 | -12 |
| -5.2 | Round 4 | SHARKS | 29 | 4♦ | ♥4 | -1 | -12 |
| -6.0 | Round 1 | CHINA RDFZ HOPE | 7 | 3♦ | ♥4 | = | -6 |
| -6.2 | Round 5 | SXMARS | 5 | 6♠ | ♦2 | = | +0 |
| -6.5 | Round 8 | SXSATURN | 26 | 4♠ | ♥5 | -1 | -12 |
| -6.5 | Round 8 | SXSATURN | 32 | 3NT | ♠J | +1 | -7 |
| -6.7 | Round 1 | CHINA RDFZ HOPE | 4 | 4♠ | ♣2 | +1 | -4 |
| -11.8 | Round 8 | SXSATURN | 28 | 3NT | ♣A | +1 | -4 |