CHEN Jien · ZUOMEICHENG

67rank
+89.6Butler · 140 bds
+0.64per board
±4.7swing
+0.28vs par /bd · #221/672
+0.76adjusted /bd
Butler per round: 2.4 -4.1 -3.7 23.5 22.3 -13 -4.8 10.8 -26.6 34.2 17.9 -3.9 9.3 25.3by round

vs par split: bidding +0.00 · play -0.06

Strength of schedule: opponents averaged +0.12/bd (a tough draw) → opponent-adjusted +0.76/bd

Card play — on target: opening leads 87.5% #182 of 671 · declarer play 90.9% #67 of 671 · defence 92.0% #75 of 672

Card play by contract type — on target
vs NTvs a suit
Opening leads·87.5% (24)
Declarer play·90.9% (22)
Defence·92.0% (50)

Opening leads by suit led: ♠ 83.3% (6) · ♥ 100.0% (3) · ♦ 88.9% (9) · ♣ 83.3% (6)

vs par by strain: a suit -0.07 (93)

vs par by level: part-score +0.45 (38) · game -0.24 (45) · slam -1.20 (10)

By role: declaring +0.07/bd (-2.16 vs par · 67) · defending +1.17/bd (+2.52 vs par · 73)

By vulnerability: vulnerable +0.78/bd (+0.08 vs par · 73) · not vulnerable +0.49/bd (+0.49 vs par · 67)

By round↑ top

RoundPartnerOpponentsRoomBdsButlerAvgvs par
Round 1Y.WuJ.Park – S.YangOpen10+2.4+0.24+1.80
Round 3Y.WuJ.Zaremba – V.MarkowiczClosed10-4.1-0.41-2.20
Round 4J.PengC.Balicki – A.ZmudzinskiOpen10-3.7-0.37-0.60
Round 5Y.WuZ.Liu – W.ZhouClosed10+23.5+2.35+3.30
Round 6J.PengH.Kondoch – F.ZimmermannOpen10+22.3+2.23+1.80
Round 7Y.WuA.Madala – A.SementaOpen10-13.0-1.30-0.60
Round 8Y.WuK.Fergani – N.L'EcuyerClosed10-4.8-0.48+0.00
Round 9J.PengZ.Nagy – D.LilleyOpen10+10.8+1.08+0.00
Round 10Y.WuB.Polii – J.TuejeOpen10-26.6-2.66-0.80
Round 11Y.WuZ.Lu – Y.WuOpen10+34.2+3.42+3.90
Round 12J.PengJ.Wang – Z.ZhangClosed10+17.9+1.79+0.80
Round 13J.PengS.Mukherjee – B.DasOpen10-3.9-0.39-3.30
Round 14J.PengA.Levy – P.ChemlaOpen10+9.3+0.93-1.80
Round 15J.PengH.Drenkelford – J.Van CleeffOpen10+25.3+2.53+1.60

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.

ButlerRoundOpponentsBdContractLeadResvs par
+13.5Round 9HOFFMAN284♥♠A-4+15
+12.0Round 11ZHEJIANG ZHENGYUAN123Nx♥3+1+8
+11.2Round 6GERMANY JUNIORS266♠♣Q-2+12
+11.2Round 11ZHEJIANG ZHENGYUAN206♣♥J=-2
+10.6Round 3MARKOWICZ296♦♠2-1+13
+9.4Round 6GERMANY JUNIORS215♣x♦Q-3+8
+8.9Round 15VENTIN261Nx♣K+1+11
+8.2Round 13TEXAN ACES44♠♦8-1+13
+7.7Round 14ZALESKI146♠♥7=-10
+7.6Round 12LANP PECH223N♠K+2+8
+7.4Round 10GABSI94♥♥2-1+9
+7.3Round 1KOREA-CHINA103Nx♠Q+1+10
+7.0Round 15VENTIN303N♠3-3+12
+6.9Round 13TEXAN ACES103Nx♣J-1+8
+6.8Round 11ZHEJIANG ZHENGYUAN166♠♦9-1+13
+6.5Round 1KOREA-CHINA74♥♠J-1+13
+6.5Round 3MARKOWICZ252N♠8-2+7
+6.2Round 5SHANGHAI JIANQIAO122♠♠3-3+7
+6.2Round 10GABSI26♦♥Q-1+10
+5.8Round 5SHANGHAI JIANQIAO193♥♠K-2+7
+5.6Round 9HOFFMAN273♦♣Q-4+8
+5.4Round 15VENTIN283♠♦A-1+5
+5.2Round 5SHANGHAI JIANQIAO133N♠2=+5
+4.8Round 14ZALESKI183♦♠8-1+9
+4.7Round 1KOREA-CHINA83N♣2-2+5
+4.4Round 15VENTIN214♠♣Q-1+5
+4.2Round 9HOFFMAN294♠♥K-3+5
+4.2Round 12LANP PECH214♥♦6-1+4
+4.1Round 13TEXAN ACES24♥♣2+1+0
+4.0Round 11ZHEJIANG ZHENGYUAN112N♠J=+7
+3.6Round 15VENTIN231N♥2=+0
+3.5Round 12LANP PECH292♠♦K=+5
+3.4Round 8L'ECUYER123N♣10-2+6
+3.2Round 14ZALESKI153♦♦J+1+1
+3.0Round 9HOFFMAN304♠♣K-1+5
+2.9Round 5SHANGHAI JIANQIAO112♠♦A-1-2
+2.9Round 5SHANGHAI JIANQIAO172♠♦2=+6
+2.9Round 11ZHEJIANG ZHENGYUAN154♠♣A-1-2
+2.6Round 8L'ECUYER204♠♥6=+0
+2.4Round 6GERMANY JUNIORS252♥♦8=-1
+2.4Round 14ZALESKI164♠♣6=+0
+2.3Round 4RUSSIA102N♠2=+0
+2.3Round 5SHANGHAI JIANQIAO184♠♣3-1+5
+2.2Round 4RUSSIA64♣♠Q-2+11
+2.2Round 11ZHEJIANG ZHENGYUAN132♥♠5+1+2
+2.2Round 12LANP PECH274♥♠A=-6
+2.1Round 4RUSSIA82♠♦Q+2+1
+2.1Round 4RUSSIA92♣♣3=-1
+2.1Round 6GERMANY JUNIORS303N♥2-2+6
+2.1Round 15VENTIN272♥♠K+1+0
+1.9Round 7LAVAZZA74♠♥3-1+6
+1.8Round 6GERMANY JUNIORS241N♠K=-1
+1.6Round 11ZHEJIANG ZHENGYUAN184♣♠K-1+4
+1.6Round 14ZALESKI113♠♣Q-2+5
+1.4Round 5SHANGHAI JIANQIAO153N♠10+3+11
+1.4Round 10GABSI64♠♣A+1+1
+1.3Round 12LANP PECH304♥♦K-1+5
+1.2Round 12LANP PECH253N♣4=-5
+1.1Round 1KOREA-CHINA63♦♣9=+1
+1.1Round 6GERMANY JUNIORS223♣♠4-3+6
+1.1Round 8L'ECUYER162♠♥K+1+0
+1.0Round 4RUSSIA51N♦5-1-1
+1.0Round 7LAVAZZA14♥♠K+1+0
+1.0Round 10GABSI42♠♥2-1+5
+0.9Round 6GERMANY JUNIORS293♦♦7=+0
+0.9Round 9HOFFMAN244♥♦4=-5
+0.9Round 13TEXAN ACES53N♠2+2-12
+0.8Round 5SHANGHAI JIANQIAO161N♦K-2+1
+0.8Round 7LAVAZZA94♥♦A+2-11
+0.8Round 10GABSI31N♣Q-2+1
+0.7Round 3MARKOWICZ223N♦8+1-5
+0.7Round 15VENTIN242♥♠7-2+5
+0.6Round 5SHANGHAI JIANQIAO204♠♣K=-1
+0.6Round 14ZALESKI134♠♣K+2-6
+0.5Round 12LANP PECH242N♠A=+6
+0.5Round 14ZALESKI171N♥4+1+0
+0.4Round 3MARKOWICZ242♥♠6+1+0
+0.4Round 9HOFFMAN252♠♣K-1-3
+0.3Round 7LAVAZZA102♥♦K=+1
+0.3Round 12LANP PECH285♦x♣9-2-4
+0.2Round 1KOREA-CHINA43♠♦Q-1+1
+0.1Round 7LAVAZZA64♥♣10=+1
+0.0Round 7LAVAZZA31N♣K-2+9
-0.0Round 13TEXAN ACES94♠♦2+1+0
-0.2Round 6GERMANY JUNIORS274♥♦K-1-5
-0.2Round 11ZHEJIANG ZHENGYUAN194♠♥8=+0
-0.2Round 15VENTIN224♠♠4+1-5
-0.3Round 3MARKOWICZ211N♣10+1-1
-0.4Round 8L'ECUYER141N♠2=+1
-0.5Round 12LANP PECH235♦♠6-1-6
-0.5Round 14ZALESKI191N♠6+1-6
-0.6Round 4RUSSIA71N♥2+1+1
-0.6Round 8L'ECUYER173N♥9=+6
-0.8Round 7LAVAZZA44♥♦4+1+0
-0.9Round 4RUSSIA23N♣2+2-1
-0.9Round 8L'ECUYER134♠♥A+2-7
-1.0Round 6GERMANY JUNIORS283N♥4+1-1
-1.0Round 8L'ECUYER181N♦Q=+1
-1.0Round 15VENTIN294♠♣K=+0
-1.2Round 13TEXAN ACES14♠♥J=+0
-1.3Round 13TEXAN ACES74♥♣A+1+0
-1.4Round 1KOREA-CHINA94N♥10+1+0
-1.4Round 8L'ECUYER192♠♥K-1+2
-1.8Round 7LAVAZZA21N♦8+1+0
-2.1Round 4RUSSIA42♠♥J+2-10
-2.3Round 1KOREA-CHINA34♠x♣A-3+4
-2.3Round 3MARKOWICZ234♠♥10+1+0
-2.4Round 12LANP PECH263N♦5-1+1
-2.5Round 9HOFFMAN223♠♣3+1-6
-2.7Round 3MARKOWICZ273N♠Q-1-5
-2.8Round 11ZHEJIANG ZHENGYUAN174♦♣Q-2-5
-2.9Round 10GABSI11N♣10=+0
-3.1Round 1KOREA-CHINA53♠♥A=+0
-3.1Round 9HOFFMAN264♠♦7-1-6
-3.3Round 4RUSSIA33N♠2+3-1
-3.5Round 11ZHEJIANG ZHENGYUAN143N♠4+2+14
-3.7Round 8L'ECUYER154♥♦Q-1-6
-3.7Round 9HOFFMAN213N♣8=-5
-3.9Round 8L'ECUYER113N♦J=-3
-4.0Round 14ZALESKI123♥♠3=-1
-4.1Round 1KOREA-CHINA24♦♣A=-5
-4.2Round 3MARKOWICZ264♠♦Q=-8
-4.5Round 13TEXAN ACES66♣♠4-1-14
-4.6Round 5SHANGHAI JIANQIAO143♣♦K=-6
-5.4Round 6GERMANY JUNIORS234♥♠7-1-6
-5.6Round 15VENTIN256♠♥3-2-17
-5.8Round 7LAVAZZA54♠♦Q+1-6
-6.3Round 3MARKOWICZ283N♥8-1-11
-6.5Round 1KOREA-CHINA12N♣K-2-11
-6.5Round 3MARKOWICZ303N♦5-1-12
-6.5Round 4RUSSIA15♥x♥A-2-5
-6.8Round 10GABSI72♦x♠K=-12
-6.8Round 13TEXAN ACES86♠♦Q-1-17
-7.0Round 14ZALESKI202♠♠5+2-10
-7.5Round 9HOFFMAN231N♠Q-2-8
-8.7Round 7LAVAZZA85♦x♣2=-6
-10.2Round 10GABSI56♠♥7=+0
-10.2Round 13TEXAN ACES33N♥2-1-11
-10.9Round 10GABSI84♠x♥2-3-9
-12.6Round 10GABSI103♣x♠A=-13