CHEN Yichao · WOLFSON
181rank
-13.9Butler · 84 bds
-0.17per board
±4.2swing
+0.98vs par /bd
-0.14adjusted /bd
by round
vs par split: bidding +1.01 · play -0.04
Strength of schedule: opponents averaged +0.03/bd (an average draw) → opponent-adjusted -0.14/bd
Card play — on target: opening leads 78.3% · declarer play 77.3% · defence 91.1%
Bidding activity — not a pass: 44.6% (108/242)
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 37.5% (8) | 100.0% (15) |
| Declarer play | 66.7% (6) | 81.2% (16) |
| Defence | 100.0% (10) | 88.6% (35) |
Opening leads by suit led: ♠ 100.0% (6) · ♥ 100.0% (7) · ♦ 33.3% (6) · ♣ 75.0% (4)
vs par by strain: NT +1.43 (21) · a suit +0.82 (63)
vs par by level: part-score +0.96 (24) · game +1.00 (59) · slam +0.00 (1)
By role: declaring +0.52/bd (-0.20 vs par · 39) · defending -0.76/bd (+2.00 vs par · 45)
By vulnerability: vulnerable +0.66/bd (+1.98 vs par · 42) · not vulnerable -0.99/bd (-0.02 vs par · 42)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round of 64 | Y.Liu | M.Sun – M.Shen | Open | 14 | -12.8 | -0.91 | +0.79 |
| Round of 64 | Y.Liu | M.Sun – M.Shen | Open | 14 | -2.3 | -0.16 | -0.43 |
| Round of 64 | Y.Liu | M.Sun – M.Shen | Open | 14 | +5.0 | +0.36 | +2.36 |
| Round of 32 | Y.Liu | S.Hult – I.Baniri | Closed | 14 | +11.3 | +0.81 | +4.21 |
| Round of 32 | Y.Liu | S.Hult – I.Baniri | Closed | 14 | -2.5 | -0.18 | +0.29 |
| Round of 32 | Y.Liu | F.Nystrom – J.Upmark | Open | 14 | -12.6 | -0.90 | -1.36 |
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 |
|---|---|---|---|---|---|---|---|
| +10.8 | Round of 32 | VENTIN | 32 | 3NT | ♠2 | = | +10 |
| +9.8 | Round of 64 | CHINA EVERTRUST | 33 | 4♠ | ♥9 | = | +13 |
| +8.0 | Round of 32 | VENTIN | 20 | 4♠ | ♥A | +3 | +17 |
| +7.8 | Round of 64 | CHINA EVERTRUST | 18 | 4♠ | ♣5 | -1 | +10 |
| +7.2 | Round of 64 | CHINA EVERTRUST | 51 | 3♥ | ♦3 | = | +7 |
| +7.1 | Round of 32 | VENTIN | 16 | 5♣x | ♥K | = | +14 |
| +6.6 | Round of 64 | CHINA EVERTRUST | 32 | 5♦ | ♥J | = | -13 |
| +5.8 | Round of 64 | CHINA EVERTRUST | 48 | 4♠x | ♠5 | -1 | +2 |
| +5.7 | Round of 64 | CHINA EVERTRUST | 56 | 5♣ | ♠A | +2 | +14 |
| +5.4 | Round of 32 | VENTIN | 18 | 1NT | ♠J | = | +9 |
| +5.3 | Round of 32 | VENTIN | 25 | 4♥ | ♠6 | -2 | +6 |
| +4.1 | Round of 64 | CHINA EVERTRUST | 47 | 3♠ | ♦8 | +4 | +18 |
| +3.9 | Round of 32 | VENTIN | 27 | 4♠ | ♥J | -1 | +4 |
| +3.8 | Round of 32 | VENTIN | 22 | 3NT | ♦2 | = | +3 |
| +3.3 | Round of 32 | VENTIN | 51 | 3NT | ♦T | -1 | +6 |
| +3.2 | Round of 32 | VENTIN | 54 | 2♥ | ♦T | +1 | +0 |
| +2.6 | Round of 32 | VENTIN | 43 | 4♠ | ♦6 | +1 | +0 |
| +2.3 | Round of 64 | CHINA EVERTRUST | 42 | 5♦x | ♣K | -2 | +0 |
| +2.1 | Round of 32 | VENTIN | 38 | 4♥ | ♣J | = | +0 |
| +1.9 | Round of 64 | CHINA EVERTRUST | 39 | 3♣ | ♥8 | = | +0 |
| +1.8 | Round of 64 | CHINA EVERTRUST | 36 | 3NT | ♣A | +2 | +1 |
| +1.8 | Round of 64 | CHINA EVERTRUST | 40 | 3NT | ♦2 | +2 | +14 |
| +1.8 | Round of 64 | CHINA EVERTRUST | 46 | 4♥ | ♥2 | +2 | +11 |
| +1.7 | Round of 64 | CHINA EVERTRUST | 21 | 2♠ | ♥7 | +1 | +1 |
| +1.7 | Round of 32 | VENTIN | 40 | 3♠ | ♣8 | = | +12 |
| +1.6 | Round of 32 | VENTIN | 48 | 1NT | ♥J | = | -1 |
| +1.5 | Round of 64 | CHINA EVERTRUST | 20 | 4♠x | ♣7 | -2 | +8 |
| +1.4 | Round of 32 | VENTIN | 34 | 4♥ | ♠A | = | +0 |
| +1.2 | Round of 64 | CHINA EVERTRUST | 16 | 3NT | ♦7 | +3 | +1 |
| +1.1 | Round of 64 | CHINA EVERTRUST | 53 | 2♦ | ♠T | = | -2 |
| +1.1 | Round of 32 | VENTIN | 50 | 2♠ | ♦K | +2 | -6 |
| +1.0 | Round of 32 | VENTIN | 17 | 3NT | ♣9 | = | +2 |
| +0.8 | Round of 64 | CHINA EVERTRUST | 29 | 5♦x | ♠K | -1 | +0 |
| +0.7 | Round of 64 | CHINA EVERTRUST | 27 | 5♠ | ♠2 | = | +1 |
| +0.7 | Round of 32 | VENTIN | 42 | 4♥ | ♣2 | +2 | +1 |
| +0.5 | Round of 64 | CHINA EVERTRUST | 49 | 3NT | ♣Q | +2 | +0 |
| +0.3 | Round of 32 | VENTIN | 33 | 2♥ | ♦3 | = | +0 |
| +0.2 | Round of 32 | VENTIN | 47 | 5♥x | ♣2 | -1 | +0 |
| +0.2 | Round of 32 | VENTIN | 56 | 1♠ | ♥A | +3 | -10 |
| +0.1 | Round of 64 | CHINA EVERTRUST | 45 | 3NT | ♦9 | +3 | -11 |
| -0.1 | Round of 64 | CHINA EVERTRUST | 22 | 4♠ | ♥9 | = | -3 |
| -0.1 | Round of 32 | VENTIN | 39 | 4♠ | ♣Q | +1 | +0 |
| -0.2 | Round of 64 | CHINA EVERTRUST | 34 | 3NT | ♣T | +1 | +0 |
| -0.3 | Round of 32 | VENTIN | 31 | 4♥ | ♠A | +1 | +0 |
| -0.5 | Round of 64 | CHINA EVERTRUST | 26 | 4♠ | ♥A | +1 | +0 |
| -0.5 | Round of 32 | VENTIN | 44 | 4♠ | ♣4 | +1 | +0 |
| -0.5 | Round of 32 | VENTIN | 52 | 2♠ | ♠2 | +1 | +0 |
| -0.7 | Round of 64 | CHINA EVERTRUST | 44 | 3NT | ♥2 | +2 | +0 |
| -0.8 | Round of 32 | VENTIN | 35 | 2♥ | ♣K | = | -6 |
| -1.0 | Round of 64 | CHINA EVERTRUST | 17 | 5♥x | ♦A | -1 | +0 |
| -1.0 | Round of 64 | CHINA EVERTRUST | 52 | 3♣ | ♠5 | +2 | -1 |
| -1.1 | Round of 64 | CHINA EVERTRUST | 24 | 4♠ | ♦5 | = | +1 |
| -1.1 | Round of 32 | VENTIN | 41 | 3NT | ♦4 | = | +1 |
| -1.2 | Round of 32 | VENTIN | 24 | 2♥ | ♦K | = | +0 |
| -1.3 | Round of 32 | VENTIN | 19 | 3♠ | ♣J | -1 | +1 |
| -1.7 | Round of 64 | CHINA EVERTRUST | 31 | 3NT | ♥T | -2 | +0 |
| -1.7 | Round of 64 | CHINA EVERTRUST | 38 | 3NT | ♦T | +1 | +0 |
| -1.9 | Round of 64 | CHINA EVERTRUST | 30 | 4♠ | ♥A | = | +0 |
| -1.9 | Round of 32 | VENTIN | 29 | 3♥ | ♣Q | = | -1 |
| -2.0 | Round of 32 | VENTIN | 46 | 2♦ | ♣K | = | +1 |
| -2.4 | Round of 32 | VENTIN | 30 | 3♦ | ♥K | -2 | +0 |
| -2.5 | Round of 64 | CHINA EVERTRUST | 19 | 5♦ | ♣A | = | +0 |
| -2.5 | Round of 32 | VENTIN | 53 | 2♥ | ♥8 | -1 | +2 |
| -2.9 | Round of 32 | VENTIN | 23 | 4♦x | ♣Q | -2 | +14 |
| -3.0 | Round of 64 | CHINA EVERTRUST | 41 | 4♠ | ♣4 | -1 | -6 |
| -3.1 | Round of 64 | CHINA EVERTRUST | 25 | 4♥ | ♦6 | -2 | +0 |
| -3.1 | Round of 32 | VENTIN | 28 | 4♠ | ♦K | -2 | +1 |
| -3.4 | Round of 64 | CHINA EVERTRUST | 54 | 3NT | ♠4 | -1 | -5 |
| -3.7 | Round of 64 | CHINA EVERTRUST | 15 | 3♠ | ♦A | -2 | -8 |
| -3.9 | Round of 64 | CHINA EVERTRUST | 55 | 6♥ | ♠2 | = | +0 |
| -4.0 | Round of 32 | VENTIN | 26 | 2♠ | ♥3 | -2 | -7 |
| -4.5 | Round of 64 | CHINA EVERTRUST | 28 | 3NT | ♦A | +1 | +0 |
| -4.6 | Round of 32 | VENTIN | 36 | 5♠ | ♥A | = | -11 |
| -4.9 | Round of 32 | VENTIN | 21 | 4♠ | ♥6 | -1 | -5 |
| -5.1 | Round of 64 | CHINA EVERTRUST | 50 | 4♠ | ♥2 | -2 | +0 |
| -5.8 | Round of 32 | VENTIN | 15 | 3NT | ♣6 | = | +0 |
| -6.1 | Round of 32 | VENTIN | 49 | 3NT | ♠2 | = | +0 |
| -6.3 | Round of 32 | VENTIN | 55 | 4♠ | ♦K | +2 | -11 |
| -6.9 | Round of 32 | VENTIN | 45 | 5♦ | ♥3 | = | +0 |
| -7.2 | Round of 64 | CHINA EVERTRUST | 43 | 3NT | ♠3 | +2 | +0 |
| -8.3 | Round of 32 | VENTIN | 37 | 4♠x | ♦3 | -2 | -2 |
| -9.0 | Round of 64 | CHINA EVERTRUST | 37 | 4♥ | ♠3 | = | -3 |
| -9.2 | Round of 64 | CHINA EVERTRUST | 23 | 4♥ | ♣K | = | +0 |
| -9.8 | Round of 64 | CHINA EVERTRUST | 35 | 5♣x | ♠A | = | -12 |