🇺🇸 BERKOWITZ David · USA2

9rank
+87.2Butler · 240 bds
+0.36per board
±4.4swing
+1.20vs par /bd · #1/22
+0.37adjusted /bd
Butler per round: 58.9 58.9 58.9 58.9 58.9 37.2 37.2 37.2 37.2 37.2 -8.9 -8.9 -8.9 -8.9 -8.9by round

vs par split: bidding +0.73 · play +0.49

Strength of schedule: opponents averaged +0.01/bd (an average draw) → opponent-adjusted +0.37/bd

Card play — on target: opening leads 79.3% #15 of 22 · declarer play 86.6% #3 of 22 · defence 91.5% #7 of 22

Card play by contract type — on target
vs NTvs a suit
Opening leads70.6% (17)82.9% (41)
Declarer play87.5% (16)86.3% (51)
Defence91.9% (37)91.3% (92)

Opening leads by suit led: ♠ 54.5% (11) · ♥ 92.9% (14) · ♦ 84.2% (19) · ♣ 78.6% (14)

vs par by strain: NT +1.36 (64) · a suit +1.17 (175)

vs par by level: part-score +0.47 (104) · game +1.98 (120) · slam +0.33 (15)

By role: declaring +0.34/bd (-0.94 vs par · 110) · defending +0.39/bd (+3.02 vs par · 130)

By vulnerability: vulnerable +0.47/bd (+1.98 vs par · 120) · not vulnerable +0.26/bd (+0.42 vs par · 120)

By round↑ top

RoundPartnerOpponentsRoomBdsButlerAvgvs par
QuarterfinalA.SontagK.Yamada – T.ImakuraOpen16+18.1+1.13+1.00
QuarterfinalA.SontagT.Imakura – M.InoOpen16+1.5+0.09+0.38
QuarterfinalA.SontagA.Omasa – T.ImakuraOpen16+5.6+0.35+2.50
QuarterfinalA.SontagT.Imakura – M.InoOpen16+12.0+0.75+2.44
QuarterfinalA.SontagK.Yamada – A.OmasaOpen16+21.7+1.36+1.88
SemifinalA.SontagC.Bjaring – J.OstbergOpen16-9.8-0.61+1.81
SemifinalA.SontagJ.Ostberg – C.BjaringClosed16+1.2+0.07+0.00
SemifinalA.SontagC.Bjaring – J.OstbergOpen16-4.9-0.31-0.25
SemifinalA.SontagB.Efraimsson – M.AxdorphClosed16+5.8+0.36+1.44
SemifinalA.SontagS.Bjerregard – A.MorathOpen16+44.9+2.81+3.94
FinalA.SontagA.Comella – S.SabbatiniOpen16+11.8+0.74+1.38
FinalA.SontagA.Buratti – G.FaillaClosed16-11.0-0.69+1.62
FinalA.SontagA.Mina – R.PulgaOpen16-15.7-0.98-1.50
FinalA.SontagA.Comella – S.SabbatiniOpen16-4.0-0.25+0.62
FinalA.SontagA.Mina – R.PulgaClosed16+10.0+0.62+0.75

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
+13.0Final🇮🇹 ITALY686♥♣J-2+17
+13.0Final🇮🇹 ITALY826♠♦6-1+15
+12.3Semifinal🇸🇪 SWEDEN872♥x♣Q+1+13
+11.7Final🇮🇹 ITALY104♥♠7+2+5
+10.0Semifinal🇸🇪 SWEDEN394♥♥7=+0
+10.0Semifinal🇸🇪 SWEDEN755♠x♦5-1+11
+10.0Semifinal🇸🇪 SWEDEN922♦♣4-1+10
+10.0Final🇮🇹 ITALY786♠♣K-1+8
+9.3Quarterfinal🇯🇵 JAPAN864♥♣Q+2+12
+8.7Final🇮🇹 ITALY333♣♣7+3+13
+8.3Quarterfinal🇯🇵 JAPAN774♠♥2=+10
+8.0Quarterfinal🇯🇵 JAPAN343NT♠K-2+6
+8.0Final🇮🇹 ITALY861NT♦7+2-1
+8.0Final🇮🇹 ITALY873♠♥A-5-4
+7.7Semifinal🇸🇪 SWEDEN612♥♦4-2+8
+7.6Quarterfinal🇯🇵 JAPAN34♠x♣J=+12
+7.6Quarterfinal🇯🇵 JAPAN514♥♦K-3+10
+7.3Semifinal🇸🇪 SWEDEN553NT♦Q-5+0
+7.1Quarterfinal🇯🇵 JAPAN354♥♣K=+0
+6.7Semifinal🇸🇪 SWEDEN771NT♠5+3+10
+6.7Semifinal🇸🇪 SWEDEN954♥x♠K-2+4
+6.4Quarterfinal🇯🇵 JAPAN136♣♥8+1+1
+6.3Final🇮🇹 ITALY161NT♦8+1+0
+6.3Final🇮🇹 ITALY494♥♣Q-1+8
+6.3Final🇮🇹 ITALY556♦♥K+1+11
+6.0Quarterfinal🇯🇵 JAPAN114♠♦3-2+11
+6.0Quarterfinal🇯🇵 JAPAN711NT♠Q=+12
+6.0Semifinal🇸🇪 SWEDEN143♠♥A+1+4
+6.0Semifinal🇸🇪 SWEDEN704♥♦6=+10
+6.0Final🇮🇹 ITALY652♥♥5+2+7
+5.9Quarterfinal🇯🇵 JAPAN573NT♥7+3+1
+5.9Quarterfinal🇯🇵 JAPAN874♠♦A-1-1
+5.4Quarterfinal🇯🇵 JAPAN753NT♣3=+7
+5.3Final🇮🇹 ITALY472♦♣9-2+3
+5.1Quarterfinal🇯🇵 JAPAN662♥♣Q+1+2
+5.0Quarterfinal🇯🇵 JAPAN654♠♠6=+0
+5.0Final🇮🇹 ITALY643♦♦5+1+0
+4.7Semifinal🇸🇪 SWEDEN124♣♦3=+1
+4.7Semifinal🇸🇪 SWEDEN843NT♦3-3+14
+4.4Quarterfinal🇯🇵 JAPAN551NT♠10=+5
+4.3Quarterfinal🇯🇵 JAPAN404♥♣K+1+0
+4.3Quarterfinal🇯🇵 JAPAN964♥♦K=+0
+4.3Semifinal🇸🇪 SWEDEN811NT♦6+2+6
+3.9Quarterfinal🇯🇵 JAPAN471NT♥4-2+11
+3.7Final🇮🇹 ITALY144NT♣4+1+0
+3.4Quarterfinal🇯🇵 JAPAN533♠♠2-1+5
+3.3Semifinal🇸🇪 SWEDEN474♠♣2=+0
+3.3Semifinal🇸🇪 SWEDEN903NT♦J-1+6
+3.3Final🇮🇹 ITALY544♠♥Q=+0
+3.0Quarterfinal🇯🇵 JAPAN24♦♣A=+1
+3.0Semifinal🇸🇪 SWEDEN54♠♥3-2+11
+2.9Quarterfinal🇯🇵 JAPAN432♥♥Q=+6
+2.7Semifinal🇸🇪 SWEDEN333♦♣A=+0
+2.6Quarterfinal🇯🇵 JAPAN362♥♦2=+0
+2.6Quarterfinal🇯🇵 JAPAN953♥♦6=+0
+2.3Semifinal🇸🇪 SWEDEN352♠♥A=+1
+2.3Semifinal🇸🇪 SWEDEN454♣♦3-1+5
+2.3Semifinal🇸🇪 SWEDEN783NT♣K+3-11
+2.0Quarterfinal🇯🇵 JAPAN742♥♣3+1+1
+2.0Semifinal🇸🇪 SWEDEN573♠♥A=+0
+2.0Semifinal🇸🇪 SWEDEN602♠♣5=+6
+2.0Semifinal🇸🇪 SWEDEN683♥♠J+1+8
+2.0Semifinal🇸🇪 SWEDEN712♥♦A=+6
+2.0Semifinal🇸🇪 SWEDEN895♣♠6=-11
+2.0Final🇮🇹 ITALY112♠♠4+1+0
+2.0Final🇮🇹 ITALY133♠♠3=+0
+1.9Quarterfinal🇯🇵 JAPAN82♥♣9-1+1
+1.7Semifinal🇸🇪 SWEDEN914♠♦4=+1
+1.7Final🇮🇹 ITALY35♦x♣A-2-10
+1.7Final🇮🇹 ITALY573NT♠8+3-11
+1.6Quarterfinal🇯🇵 JAPAN463♥♣5-1-2
+1.6Quarterfinal🇯🇵 JAPAN903♥♠A-1+0
+1.6Quarterfinal🇯🇵 JAPAN924♠♦K+1+0
+1.4Quarterfinal🇯🇵 JAPAN104♥♠K+1+0
+1.4Quarterfinal🇯🇵 JAPAN644♠♣A+1+0
+1.4Quarterfinal🇯🇵 JAPAN892♦♣A-1+3
+1.3Quarterfinal🇯🇵 JAPAN44♥♣A-1+12
+1.3Semifinal🇸🇪 SWEDEN502NT♥4+1+7
+1.3Semifinal🇸🇪 SWEDEN731NT♥6=+7
+1.3Semifinal🇸🇪 SWEDEN945♣x♥7-3+2
+1.3Final🇮🇹 ITALY404♥♦A-2+6
+1.3Final🇮🇹 ITALY483♣♥K-2-9
+1.1Quarterfinal🇯🇵 JAPAN622♥♣5+1+6
+1.1Quarterfinal🇯🇵 JAPAN944♠x♦A-2+4
+1.0Quarterfinal🇯🇵 JAPAN73♦♠K-1-11
+1.0Semifinal🇸🇪 SWEDEN404♠♣4+1+11
+1.0Semifinal🇸🇪 SWEDEN435♣♥9-1+4
+1.0Semifinal🇸🇪 SWEDEN882♥♥7=+0
+1.0Final🇮🇹 ITALY723NT♦2+1+0
+0.9Quarterfinal🇯🇵 JAPAN524♥♠J+1+1
+0.9Quarterfinal🇯🇵 JAPAN673♠♠2-1+2
+0.7Quarterfinal🇯🇵 JAPAN13♠♣7-1+5
+0.7Quarterfinal🇯🇵 JAPAN604♥♦4=+11
+0.7Semifinal🇸🇪 SWEDEN834♥♠J-1+2
+0.7Final🇮🇹 ITALY353♠♣2=+0
+0.6Quarterfinal🇯🇵 JAPAN761NT♠2+3-10
+0.6Quarterfinal🇯🇵 JAPAN803NT♠J+2+13
+0.4Quarterfinal🇯🇵 JAPAN152♠♦A-1-2
+0.4Quarterfinal🇯🇵 JAPAN934♠♦A=+1
+0.3Quarterfinal🇯🇵 JAPAN91NT♦A=-2
+0.3Quarterfinal🇯🇵 JAPAN814♥♠10-2+6
+0.3Quarterfinal🇯🇵 JAPAN912♠x♣9-2+4
+0.3Semifinal🇸🇪 SWEDEN133♠♥K+1+10
+0.3Semifinal🇸🇪 SWEDEN593NT♥3=+1
+0.3Semifinal🇸🇪 SWEDEN863♥♦3-1+5
+0.3Final🇮🇹 ITALY11NT♥3=+5
+0.3Final🇮🇹 ITALY561NT♣5-2+1
+0.0Quarterfinal🇯🇵 JAPAN64♠♣Q-1-4
+0.0Quarterfinal🇯🇵 JAPAN485♦♣K-1+6
+0.0Quarterfinal🇯🇵 JAPAN544♠♣10+1+0
+0.0Quarterfinal🇯🇵 JAPAN583NT♠J=+1
+0.0Semifinal🇸🇪 SWEDEN94♠♣8=+0
+0.0Semifinal🇸🇪 SWEDEN103NT♠10=+0
+0.0Semifinal🇸🇪 SWEDEN163NT♥3-1+12
-0.0Semifinal🇸🇪 SWEDEN424♥♥10+1+0
-0.0Semifinal🇸🇪 SWEDEN654♠♣A+2-11
-0.0Semifinal🇸🇪 SWEDEN764♠♣6+1+0
+0.0Semifinal🇸🇪 SWEDEN854♠♦J+1+0
-0.0Final🇮🇹 ITALY413NT♣3-1-6
-0.0Final🇮🇹 ITALY424♠♥K+2+13
-0.0Final🇮🇹 ITALY444♠♣J=+0
-0.0Final🇮🇹 ITALY462♠♥3=+0
+0.0Final🇮🇹 ITALY534♥♠K+2+11
+0.0Final🇮🇹 ITALY582NT♦10+1-1
+0.0Final🇮🇹 ITALY674♥♠J+1+0
+0.0Final🇮🇹 ITALY743NT♣3+3+13
+0.0Final🇮🇹 ITALY753♠♥4-1-4
+0.0Final🇮🇹 ITALY764♠♦Q+1+0
+0.0Final🇮🇹 ITALY771NT♠Q+2-10
+0.0Final🇮🇹 ITALY796♥♦7=+0
+0.0Final🇮🇹 ITALY804♥♠A+1+1
-0.0Final🇮🇹 ITALY833NT♣Q=+1
-0.0Final🇮🇹 ITALY843♠♣3=+0
-0.0Final🇮🇹 ITALY853NT♣3+2+0
-0.0Final🇮🇹 ITALY884♥♠10-1+8
-0.0Final🇮🇹 ITALY891NTx♥7-3-3
-0.0Final🇮🇹 ITALY911NT♥Q+1-1
-0.0Final🇮🇹 ITALY941NT♥3-1+2
-0.0Final🇮🇹 ITALY954♥♦6=+1
-0.1Quarterfinal🇯🇵 JAPAN853NT♥6+1+0
-0.3Quarterfinal🇯🇵 JAPAN693NT♣7+1+1
-0.3Semifinal🇸🇪 SWEDEN33NT♦Q+1-1
-0.3Semifinal🇸🇪 SWEDEN41NT♦5-1+5
-0.3Semifinal🇸🇪 SWEDEN74♠♦8+1+0
-0.3Semifinal🇸🇪 SWEDEN82♠♣10+1+0
-0.3Semifinal🇸🇪 SWEDEN155♦♠10+1+11
-0.3Semifinal🇸🇪 SWEDEN444♥♣10=-1
-0.3Semifinal🇸🇪 SWEDEN511NT♠4=-2
-0.3Semifinal🇸🇪 SWEDEN584♠♦6+1+0
-0.3Semifinal🇸🇪 SWEDEN624♠♣J=+0
-0.3Semifinal🇸🇪 SWEDEN634♥♠10=+3
-0.3Semifinal🇸🇪 SWEDEN794♥♣K+1+0
-0.3Final🇮🇹 ITALY44♥♠Q+1+0
-0.3Final🇮🇹 ITALY93NT♦4+1-1
-0.4Quarterfinal🇯🇵 JAPAN683♥♣K+1+10
-0.4Quarterfinal🇯🇵 JAPAN721NT♠2+1-1
-0.4Quarterfinal🇯🇵 JAPAN785♣♠3=+2
-0.4Quarterfinal🇯🇵 JAPAN825♣♠A+1-5
-0.7Semifinal🇸🇪 SWEDEN462♠♣3=+1
-0.7Semifinal🇸🇪 SWEDEN964♠♥5+2-1
-0.7Final🇮🇹 ITALY454♥♣6+2+13
-0.9Quarterfinal🇯🇵 JAPAN611NT♥3-1+5
-0.9Quarterfinal🇯🇵 JAPAN793NT♠3+2+0
-0.9Quarterfinal🇯🇵 JAPAN843♠♣6-1+6
-1.0Quarterfinal🇯🇵 JAPAN124♠♥A-1+5
-1.0Quarterfinal🇯🇵 JAPAN442♥♣A+1+0
-1.0Semifinal🇸🇪 SWEDEN412♥♦K+2+1
-1.0Semifinal🇸🇪 SWEDEN691NT♦7+4-5
-1.0Semifinal🇸🇪 SWEDEN823NT♥5+3+11
-1.0Final🇮🇹 ITALY63NT♠10+2-2
-1.0Final🇮🇹 ITALY152♠♦Q-1+4
-1.0Final🇮🇹 ITALY344♥♠J-1+6
-1.0Final🇮🇹 ITALY363NT♠Q+2-1
-1.0Final🇮🇹 ITALY713NT♠5+1-1
-1.3Quarterfinal🇯🇵 JAPAN423♦♣A=-10
-1.3Quarterfinal🇯🇵 JAPAN454♥♣9+1+1
-1.3Semifinal🇸🇪 SWEDEN13♦♣7=-1
-1.3Semifinal🇸🇪 SWEDEN643NT♥6+1-10
-1.3Final🇮🇹 ITALY53NT♠4+3+10
-1.6Quarterfinal🇯🇵 JAPAN141♥x♣J-1+0
-1.7Quarterfinal🇯🇵 JAPAN493NT♣K=-2
-1.7Semifinal🇸🇪 SWEDEN362♥♣4=-6
-1.7Semifinal🇸🇪 SWEDEN932♦♦6-1+1
-1.7Final🇮🇹 ITALY74♠♦3+2+13
-1.7Final🇮🇹 ITALY393♣♠Q-1-5
-1.9Quarterfinal🇯🇵 JAPAN166♠♦9=+0
-2.0Semifinal🇸🇪 SWEDEN483♣♥K-1-2
-2.0Semifinal🇸🇪 SWEDEN743NT♦4-1+5
-2.0Final🇮🇹 ITALY83NT♥6=+0
-2.0Final🇮🇹 ITALY123NT♠6+1+0
-2.0Final🇮🇹 ITALY504♠♣4=+0
-2.0Final🇮🇹 ITALY812♣x♦7=-2
-2.1Quarterfinal🇯🇵 JAPAN885♠♣8=+0
-2.3Semifinal🇸🇪 SWEDEN113♣♣8=-5
-2.3Final🇮🇹 ITALY374♥♦A+1-4
-2.4Quarterfinal🇯🇵 JAPAN394♠♦5=+1
-2.4Quarterfinal🇯🇵 JAPAN633NT♠5+3+11
-2.7Semifinal🇸🇪 SWEDEN373♥♦3=-6
-2.7Semifinal🇸🇪 SWEDEN494♦♣10-1-5
-3.0Final🇮🇹 ITALY624♠♥2=+0
-3.0Final🇮🇹 ITALY963♦♥Q-1-3
-3.3Quarterfinal🇯🇵 JAPAN386♠♣A=+0
-3.3Semifinal🇸🇪 SWEDEN524♣♠Q-1-6
-3.3Semifinal🇸🇪 SWEDEN672♥♦A=+1
-3.3Semifinal🇸🇪 SWEDEN801NT♦6+1+1
-3.3Final🇮🇹 ITALY595♣♠3-1-5
-3.4Quarterfinal🇯🇵 JAPAN594♥♣6-1-4
-3.6Quarterfinal🇯🇵 JAPAN413♠♦K+1-6
-3.6Quarterfinal🇯🇵 JAPAN832NT♠2+1+0
-4.0Quarterfinal🇯🇵 JAPAN373♥♠2-2-7
-4.0Semifinal🇸🇪 SWEDEN534♠♦3+2-1
-4.0Final🇮🇹 ITALY513♥♦9+1-7
-4.0Final🇮🇹 ITALY525♦♥2=+0
-4.0Final🇮🇹 ITALY935♣x♦6-2+8
-4.3Semifinal🇸🇪 SWEDEN723♦♣8-1-4
-4.4Quarterfinal🇯🇵 JAPAN563NT♠2-1-10
-4.7Semifinal🇸🇪 SWEDEN343♣♠5=-6
-5.0Final🇮🇹 ITALY903♥♣A-1-5
-5.0Final🇮🇹 ITALY92Pass-4
-5.7Final🇮🇹 ITALY605♣♠2-2-11
-6.0Final🇮🇹 ITALY693♣♣K-4+0
-6.0Final🇮🇹 ITALY701♠♥4+1+0
-6.3Semifinal🇸🇪 SWEDEN541♠♣3=-5
-6.3Final🇮🇹 ITALY23♠♦K-1-2
-6.3Final🇮🇹 ITALY612♠♣5+2-10
-6.7Semifinal🇸🇪 SWEDEN63NT♣J-1-5
-6.7Semifinal🇸🇪 SWEDEN566♦♠5=+0
-7.0Quarterfinal🇯🇵 JAPAN505♣♠A=+0
-7.1Quarterfinal🇯🇵 JAPAN736♠♠5-1-11
-7.4Quarterfinal🇯🇵 JAPAN56♠♥5-1-13
-8.3Semifinal🇸🇪 SWEDEN384♥♦A-1-2
-9.3Final🇮🇹 ITALY433NT♣6=-6
-10.0Final🇮🇹 ITALY662♥♦K+2-10
-10.3Semifinal🇸🇪 SWEDEN664♥♣4-1-5
-10.3Final🇮🇹 ITALY633♦x♦4+1-10
-11.0Final🇮🇹 ITALY736♠♣5+1-11
-12.0Quarterfinal🇯🇵 JAPAN336NT♦6=+0
-12.0Semifinal🇸🇪 SWEDEN26♦x♠9-2-13
-12.3Final🇮🇹 ITALY382♠x♠6-3+3
-12.4Quarterfinal🇯🇵 JAPAN706♦♥6=+1