🇺🇸 CAI Yichen · USA2
44rank
+14.9Butler · 88 bds
+0.17per board
±4.8swing
+0.34vs par /bd · #34/87
-0.19adjusted /bd
by round
vs par split: bidding -0.23 · play +0.57
Strength of schedule: opponents averaged -0.36/bd (an easy draw) → opponent-adjusted -0.19/bd
Card play — on target: opening leads 82.4% #50 of 87 · declarer play 87.0% #5 of 87 · defence 88.9% #17 of 87
Bidding activity — not a pass: 44.8% #28 of 87 (107/239)
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 66.7% (6) | 90.9% (11) |
| Declarer play | 66.7% (3) | 90.0% (20) |
| Defence | 100.0% (14) | 83.9% (31) |
Opening leads by suit led: ♠ 100.0% (2) · ♥ 66.7% (6) · ♦ 83.3% (6) · ♣ 100.0% (3)
vs par by strain: NT +2.87 (23) · a suit -0.55 (65)
vs par by level: part-score +0.42 (36) · game +0.11 (46) · slam +1.67 (6)
By role: declaring +0.48/bd (-0.86 vs par · 43) · defending -0.12/bd (+1.49 vs par · 45)
By vulnerability: vulnerable -0.17/bd (-0.09 vs par · 44) · not vulnerable +0.51/bd (+0.77 vs par · 44)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round 2 | S.Chu | V.Dalpozzo – F.Dalpozzo | Open | 8 | -0.2 | -0.03 | -0.50 |
| Round 3 | S.Chu | E.Nugues – M.Bultel | Open | 8 | -0.2 | -0.03 | +0.12 |
| Round 5 | S.Chu | W.Yeung – Y.Tse | Open | 8 | +8.4 | +1.05 | +1.38 |
| Round 6 | S.Chu | C.Wedvik – S.Grande-Weberg | Open | 8 | +0.1 | +0.01 | -0.88 |
| Round 7 | S.Chu | H.Mraz – E.Torok | Closed | 8 | +3.5 | +0.44 | -2.25 |
| Round 9 | S.Chu | A.Zeman – H.Cork | Closed | 8 | -7.4 | -0.93 | -0.12 |
| Round 10 | S.Chu | K.Ang – T.Gao | Open | 8 | +38.5 | +4.81 | +5.62 |
| Round 12 | S.Chu | K.Schwalbach – F.Oelker | Open | 8 | -0.9 | -0.11 | +2.75 |
| Round 13 | S.Chu | C.Pan – S.Jiang | Closed | 8 | -15.0 | -1.88 | -1.25 |
| Round 14 | S.Chu | L.Ciborowska – M.Klimiuk | Closed | 8 | -13.5 | -1.69 | -1.62 |
| Round 15 | S.Chu | G.Fibert – Y.Kapiluto | Closed | 8 | +1.6 | +0.20 | +0.50 |
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 |
|---|---|---|---|---|---|---|---|
| +11.0 | Round 10 | 🇸🇬 SINGAPORE | 23 | 3NT | ♥7 | -3 | +14 |
| +9.4 | Round 10 | 🇸🇬 SINGAPORE | 20 | 1NTx | ♦2 | -2 | +9 |
| +9.3 | Round 10 | 🇸🇬 SINGAPORE | 19 | 3NT | ♦5 | -1 | +10 |
| +9.3 | Round 15 | 🇮🇱 ISRAEL | 15 | 4♣ | ♥2 | -4 | +10 |
| +8.7 | Round 15 | 🇮🇱 ISRAEL | 12 | 3NT | ♥4 | -2 | +13 |
| +8.2 | Round 5 | 🇭🇰 HONG KONG CHINA | 6 | 3NT | ♠2 | -2 | +13 |
| +7.5 | Round 3 | 🇫🇷 FRANCE | 18 | 5♦ | ♥A | = | +11 |
| +7.3 | Round 7 | 🇭🇺 HUNGARY | 25 | 5♥ | ♦6 | = | +4 |
| +7.1 | Round 12 | 🇩🇪 GERMANY | 17 | 3NT | ♠4 | -1 | +10 |
| +6.8 | Round 12 | 🇩🇪 GERMANY | 20 | 2♠ | ♦Q | = | +12 |
| +6.7 | Round 14 | 🇵🇱 POLAND | 5 | 6NT | ♣K | -2 | +11 |
| +6.5 | Round 10 | 🇸🇬 SINGAPORE | 21 | 3NT | ♣T | = | +7 |
| +5.9 | Round 3 | 🇫🇷 FRANCE | 24 | 5♦ | ♠9 | -4 | +8 |
| +5.1 | Round 10 | 🇸🇬 SINGAPORE | 24 | 5♦ | ♠A | = | -1 |
| +4.2 | Round 13 | 🇨🇳 CHINA | 27 | 2♥ | ♦J | +2 | +7 |
| +4.1 | Round 15 | 🇮🇱 ISRAEL | 16 | 3NT | ♠2 | -1 | +5 |
| +3.7 | Round 6 | 🇳🇴 NORWAY | 23 | 3♠ | ♥8 | -2 | +8 |
| +3.7 | Round 9 | 🏴 ENGLAND | 9 | 6♠ | ♥T | = | +0 |
| +3.5 | Round 15 | 🇮🇱 ISRAEL | 10 | 5♠ | ♥8 | = | -12 |
| +3.3 | Round 2 | 🇮🇹 ITALY | 12 | 3♥ | ♠A | = | +0 |
| +2.9 | Round 5 | 🇭🇰 HONG KONG CHINA | 8 | 2NT | ♦3 | = | +1 |
| +2.6 | Round 2 | 🇮🇹 ITALY | 16 | 3♦ | ♣A | +1 | +1 |
| +2.3 | Round 7 | 🇭🇺 HUNGARY | 31 | 4♠ | ♣7 | = | +0 |
| +2.1 | Round 2 | 🇮🇹 ITALY | 14 | 4♠ | ♣5 | = | +8 |
| +2.0 | Round 7 | 🇭🇺 HUNGARY | 26 | 3♥ | ♦A | -1 | +0 |
| +2.0 | Round 10 | 🇸🇬 SINGAPORE | 22 | 4♠ | ♥3 | +2 | -1 |
| +1.9 | Round 6 | 🇳🇴 NORWAY | 18 | 4♠ | ♦T | -1 | +0 |
| +1.9 | Round 14 | 🇵🇱 POLAND | 6 | 4♥ | ♠K | = | +0 |
| +1.6 | Round 3 | 🇫🇷 FRANCE | 19 | 2♠ | ♦J | = | +0 |
| +1.4 | Round 9 | 🏴 ENGLAND | 11 | 3NT | ♥2 | +2 | +0 |
| +1.4 | Round 12 | 🇩🇪 GERMANY | 21 | 4♥ | ♦K | = | +0 |
| +1.4 | Round 13 | 🇨🇳 CHINA | 26 | 2♥ | ♣9 | = | +0 |
| +1.3 | Round 9 | 🏴 ENGLAND | 15 | 1NT | ♦8 | +1 | +1 |
| +1.3 | Round 14 | 🇵🇱 POLAND | 3 | 3♣ | ♠K | -1 | -4 |
| +1.2 | Round 3 | 🇫🇷 FRANCE | 21 | 1NT | ♦7 | +1 | +0 |
| +1.2 | Round 9 | 🏴 ENGLAND | 16 | 4♣ | ♥T | -3 | -6 |
| +1.0 | Round 6 | 🇳🇴 NORWAY | 20 | 1♠ | ♦6 | +2 | +0 |
| +0.9 | Round 2 | 🇮🇹 ITALY | 15 | 3♠ | ♥7 | = | -7 |
| +0.9 | Round 7 | 🇭🇺 HUNGARY | 29 | 3♣x | ♥A | -2 | -4 |
| +0.9 | Round 13 | 🇨🇳 CHINA | 28 | 4♠ | ♦T | = | +6 |
| +0.8 | Round 5 | 🇭🇰 HONG KONG CHINA | 7 | 4♠ | ♥4 | = | +0 |
| +0.7 | Round 12 | 🇩🇪 GERMANY | 23 | 3♠ | ♦6 | -1 | +11 |
| +0.5 | Round 5 | 🇭🇰 HONG KONG CHINA | 2 | 4♥ | ♣A | -1 | +1 |
| +0.5 | Round 6 | 🇳🇴 NORWAY | 24 | 2♦ | ♥A | +1 | +0 |
| +0.5 | Round 14 | 🇵🇱 POLAND | 8 | 1NT | ♣T | +1 | +0 |
| +0.4 | Round 2 | 🇮🇹 ITALY | 9 | 4♠ | ♦9 | = | +0 |
| +0.4 | Round 5 | 🇭🇰 HONG KONG CHINA | 1 | 3♠ | ♥8 | -2 | +5 |
| +0.3 | Round 2 | 🇮🇹 ITALY | 11 | 3♦ | ♥9 | = | +7 |
| +0.3 | Round 5 | 🇭🇰 HONG KONG CHINA | 4 | 3♦ | ♣8 | +1 | +0 |
| -0.1 | Round 3 | 🇫🇷 FRANCE | 20 | 3NT | ♦5 | +1 | -1 |
| -0.1 | Round 5 | 🇭🇰 HONG KONG CHINA | 3 | 4♠ | ♠8 | = | +0 |
| -0.1 | Round 14 | 🇵🇱 POLAND | 2 | 1NT | ♥7 | +2 | -1 |
| -0.2 | Round 6 | 🇳🇴 NORWAY | 21 | 3NT | ♥6 | +2 | -10 |
| -0.3 | Round 7 | 🇭🇺 HUNGARY | 32 | 5♥ | ♠K | +1 | -9 |
| -0.5 | Round 9 | 🏴 ENGLAND | 12 | 5♥x | ♠7 | -1 | +0 |
| -0.5 | Round 15 | 🇮🇱 ISRAEL | 11 | 4♠ | ♦5 | +1 | +0 |
| -0.7 | Round 3 | 🇫🇷 FRANCE | 22 | 3NT | ♦6 | +1 | -1 |
| -1.3 | Round 12 | 🇩🇪 GERMANY | 18 | 2♠ | ♥K | = | +1 |
| -1.4 | Round 12 | 🇩🇪 GERMANY | 19 | 4♠ | ♥K | = | +1 |
| -1.5 | Round 13 | 🇨🇳 CHINA | 29 | 2♥ | ♣6 | = | +1 |
| -1.7 | Round 6 | 🇳🇴 NORWAY | 19 | 4♥ | ♦3 | = | +0 |
| -1.8 | Round 7 | 🇭🇺 HUNGARY | 27 | 2♠ | ♣2 | +2 | +6 |
| -1.9 | Round 7 | 🇭🇺 HUNGARY | 30 | 4♠ | ♥2 | +2 | -1 |
| -2.1 | Round 6 | 🇳🇴 NORWAY | 22 | 3NT | ♣6 | = | +0 |
| -2.1 | Round 10 | 🇸🇬 SINGAPORE | 17 | 2♠ | ♥2 | +1 | +0 |
| -2.2 | Round 12 | 🇩🇪 GERMANY | 22 | 3NT | ♠T | +1 | -1 |
| -2.5 | Round 13 | 🇨🇳 CHINA | 30 | 4♠ | ♥6 | = | +1 |
| -2.7 | Round 10 | 🇸🇬 SINGAPORE | 18 | 4♥x | ♣A | -2 | +7 |
| -2.8 | Round 9 | 🏴 ENGLAND | 14 | 2♥ | ♣7 | +1 | +0 |
| -3.0 | Round 6 | 🇳🇴 NORWAY | 17 | 3♠ | ♦5 | -2 | -5 |
| -4.1 | Round 2 | 🇮🇹 ITALY | 10 | 3♥ | ♣K | +1 | -6 |
| -4.6 | Round 5 | 🇭🇰 HONG KONG CHINA | 5 | 2♠ | ♥A | = | -9 |
| -4.7 | Round 3 | 🇫🇷 FRANCE | 23 | 4♥x | ♣Q | = | -4 |
| -4.8 | Round 13 | 🇨🇳 CHINA | 32 | 3NT | ♦4 | -1 | -6 |
| -5.0 | Round 7 | 🇭🇺 HUNGARY | 28 | 6♠ | ♥5 | -1 | -14 |
| -5.0 | Round 14 | 🇵🇱 POLAND | 4 | 3♥ | ♣7 | = | -6 |
| -5.2 | Round 13 | 🇨🇳 CHINA | 25 | 3NT | ♥7 | -1 | -6 |
| -5.2 | Round 15 | 🇮🇱 ISRAEL | 14 | 3NT | ♠6 | -3 | -2 |
| -5.7 | Round 2 | 🇮🇹 ITALY | 13 | 3♥ | ♠Q | = | -7 |
| -5.8 | Round 9 | 🏴 ENGLAND | 10 | 5♠ | ♦K | -1 | -9 |
| -5.9 | Round 9 | 🏴 ENGLAND | 13 | 6♠ | ♣4 | = | +13 |
| -7.4 | Round 15 | 🇮🇱 ISRAEL | 13 | 1♥ | ♥2 | +4 | -10 |
| -7.5 | Round 13 | 🇨🇳 CHINA | 31 | 4♠ | ♥A | = | -13 |
| -8.8 | Round 14 | 🇵🇱 POLAND | 1 | 6♠ | ♦7 | = | +0 |
| -10.0 | Round 14 | 🇵🇱 POLAND | 7 | 4♥ | ♣A | = | -13 |
| -10.9 | Round 3 | 🇫🇷 FRANCE | 17 | 4♠x | ♦J | -3 | -12 |
| -10.9 | Round 15 | 🇮🇱 ISRAEL | 9 | 6♥ | ♠J | = | +0 |
| -12.0 | Round 12 | 🇩🇪 GERMANY | 24 | 5♣x | ♦6 | -5 | -12 |