BERKOWITZ David · GORDON

21rank
+97.6Butler · 100 bds
+0.98per board
±4.7swing
+1.59vs par /bd · #14/471
+1.13adjusted /bd
Butler per round: 13.2 -25.5 24 -8.1 18 0 30.1 27.2 -0.3 19by round

vs par split: bidding +0.59 · play +1.05

Strength of schedule: opponents averaged +0.15/bd (a tough draw) → opponent-adjusted +1.13/bd

Card play — on target: opening leads 76.7% #275 of 469 · declarer play 77.3% #177 of 469 · defence 92.7% #32 of 471

Card play by contract type — on target
vs NTvs a suit
Opening leads62.5% (8)81.8% (22)
Declarer play100.0% (5)70.6% (17)
Defence93.3% (15)92.5% (40)

Opening leads by suit led: ♠ 83.3% (6) · ♥ 84.6% (13) · ♦ 60.0% (10) · ♣ 100.0% (1)

vs par by strain: NT +3.59 (29) · a suit +0.78 (71)

vs par by level: part-score -0.17 (35) · game +2.81 (58) · slam +0.29 (7)

By role: declaring +1.83/bd (-0.75 vs par · 44) · defending +0.31/bd (+3.43 vs par · 56)

By vulnerability: vulnerable +0.90/bd (+0.59 vs par · 49) · not vulnerable +1.05/bd (+2.55 vs par · 51)

By round↑ top

RoundPartnerOpponentsRoomBdsButlerAvgvs par
Round 3A.SontagR.Donkersloot – F.LemaOpen10+13.2+1.32+2.00
Round 4A.SontagP.Balakrishnan – R.TewariOpen10-25.5-2.55-0.90
Round 5A.SontagD.Lindop – R.LebiClosed10+24.0+2.40+1.20
Round 7A.SontagS.Suhendro – P.SugandiOpen10-8.1-0.81-1.50
Round 8A.SontagZ.Liao – Z.XieClosed10+18.0+1.80+5.70
Round 10A.SontagA.Dubinin – A.GromovOpen10+0.0+0.00+0.00
Round 11A.SontagJ.Fritsche – R.RohowskyClosed10+30.1+3.01+1.70
Round 13A.SontagS.Ali – R.KandouwClosed10+27.2+2.72+0.30
Round 14A.SontagG.Haase – D.DiamondClosed10-0.3-0.03+3.00
Round 15A.SontagJ.Wojcieszek – P.JassemOpen10+19.0+1.90+4.40

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
+13.0Round 14SCOTLAND136♦♥J-2+13
+12.4Round 10GROMOV23♣x♠A=+11
+10.4Round 11DEUTSCHLAND197♠♥3=+0
+10.4Round 15POLISH STUDENTS253NT♣A=+10
+9.8Round 3BOCA SENIORS214♠x♣K=+12
+9.0Round 5CANALIENS194♠♣10-2+11
+9.0Round 11DEUTSCHLAND183NT♠2+1+0
+8.8Round 3BOCA SENIORS296♠♣J=+0
+8.2Round 13ASINDO MAKASSAR66♠♣K=-13
+7.8Round 5CANALIENS144♠x♥K-4+9
+7.6Round 8CHINA JIEGAO174♥♣3-2+17
+7.0Round 7DJARUM BRIDGE CLUB101NT♥5-2+8
+7.0Round 10GROMOV34♠♦Q-6+10
+6.4Round 8CHINA JIEGAO143NT♥2-4+8
+6.3Round 14SCOTLAND124♠♦J-1+12
+6.1Round 15POLISH STUDENTS233♠♣4=+0
+5.3Round 4NADAR54♠♥4=+7
+5.2Round 13ASINDO MAKASSAR73NT♦6-2+8
+5.1Round 11DEUTSCHLAND173NT♠2-1+10
+5.0Round 3BOCA SENIORS283NT♥5=+11
+5.0Round 15POLISH STUDENTS223♣♠2-2+11
+4.9Round 13ASINDO MAKASSAR43NT♠K-1+12
+4.7Round 13ASINDO MAKASSAR105♣+1-2
+4.5Round 5CANALIENS153NT♣6-2+8
+4.3Round 8CHINA JIEGAO195♠♣Q-1+11
+4.1Round 5CANALIENS114NT♠2+1+1
+3.9Round 4NADAR12NT♠3+2+10
+3.6Round 5CANALIENS134♠♥9-1+6
+3.6Round 8CHINA JIEGAO163NT♣K+1+8
+3.5Round 3BOCA SENIORS272♦♥8-1+5
+3.5Round 11DEUTSCHLAND205♣♦K=+3
+3.4Round 11DEUTSCHLAND133NT♣10=-1
+3.0Round 13ASINDO MAKASSAR14♠♥Q=+0
+2.9Round 5CANALIENS124♥♦A+2+1
+2.7Round 15POLISH STUDENTS271NT♦Q-2+5
+2.4Round 13ASINDO MAKASSAR52NT♦8=-7
+2.3Round 14SCOTLAND202♠♦Q-1+0
+2.3Round 15POLISH STUDENTS294♥♠Q-1+6
+2.1Round 10GROMOV64♥♦5+1+1
+2.0Round 11DEUTSCHLAND124♥♦A+1+0
+1.6Round 13ASINDO MAKASSAR32♥♣3+1+6
+1.3Round 14SCOTLAND195♣♣9+1-5
+1.1Round 13ASINDO MAKASSAR23NT♠2=+0
+0.9Round 3BOCA SENIORS244♠♥4+1+1
+0.9Round 10GROMOV81NT♥7-1+2
+0.9Round 11DEUTSCHLAND142♥♦10-2+0
+0.8Round 8CHINA JIEGAO181NT♦10+4+9
+0.7Round 7DJARUM BRIDGE CLUB34♣♣3+1-6
+0.7Round 8CHINA JIEGAO202♥♣K+2+1
+0.5Round 5CANALIENS203♦♣A=+0
+0.4Round 7DJARUM BRIDGE CLUB51NT♦9+1+1
+0.2Round 8CHINA JIEGAO153♣♦A+1-7
+0.1Round 14SCOTLAND144♠♥3+2+8
+0.0Round 7DJARUM BRIDGE CLUB13♦♠8+2-4
-0.1Round 15POLISH STUDENTS303NT♣4+2+1
-0.2Round 7DJARUM BRIDGE CLUB64♥♣9=+1
-0.3Round 15POLISH STUDENTS244♥♦3+2-1
-0.5Round 3BOCA SENIORS304♥♠J+1+11
-0.5Round 8CHINA JIEGAO113NT♥10+1+10
-0.8Round 14SCOTLAND172♠♣8=+0
-0.9Round 5CANALIENS182NT♦6-1-10
-1.0Round 13ASINDO MAKASSAR83NT♦6+3-1
-1.1Round 3BOCA SENIORS264♥♦Q=+0
-1.1Round 11DEUTSCHLAND113NT♥3+1+10
-1.2Round 7DJARUM BRIDGE CLUB91♠♦Q+2+0
-1.2Round 10GROMOV93♦♥4+1+0
-1.3Round 4NADAR64♠♥K+1+10
-1.3Round 4NADAR73NT♠5+2-1
-1.3Round 11DEUTSCHLAND153NT♣6-1-5
-1.5Round 3BOCA SENIORS253♠♥A=-6
-1.7Round 10GROMOV15♣♦K+1-11
-1.7Round 15POLISH STUDENTS263♦♥Q+1+0
-1.8Round 10GROMOV53NT♣4=+1
-1.8Round 11DEUTSCHLAND164♥♠6=+0
-1.9Round 7DJARUM BRIDGE CLUB74♥♦2=+0
-2.2Round 15POLISH STUDENTS213♠♥A=+0
-2.4Round 8CHINA JIEGAO125♦♣J=+1
-2.7Round 8CHINA JIEGAO132♠♥7+1-1
-2.9Round 13ASINDO MAKASSAR94♠+1+0
-3.1Round 4NADAR105♣♥3+1-9
-3.2Round 15POLISH STUDENTS285♦x♥A-4+12
-3.3Round 4NADAR23♥♠A=+0
-3.3Round 10GROMOV42♥♥5=+0
-3.5Round 5CANALIENS174♥♦3+2-11
-4.0Round 5CANALIENS162♠♥10-2-3
-4.1Round 7DJARUM BRIDGE CLUB22♠x♦Q-2-2
-4.3Round 4NADAR33♠♥K=-6
-4.3Round 14SCOTLAND116♠♥5=+11
-4.4Round 7DJARUM BRIDGE CLUB44♥♣4-3-5
-4.4Round 7DJARUM BRIDGE CLUB83♦♥J+1-8
-4.4Round 14SCOTLAND153NT♥6=+0
-4.8Round 3BOCA SENIORS222♣♠A=-11
-5.2Round 4NADAR44♥♠7-1-12
-5.4Round 10GROMOV71NT♥5-3-4
-5.9Round 14SCOTLAND185♥♠K=+0
-6.9Round 3BOCA SENIORS234♥♦4=-3
-7.1Round 4NADAR84♥♦Q=-8
-7.9Round 14SCOTLAND166♥♥4-1-9
-9.0Round 10GROMOV104♥♦4=-10
-9.1Round 4NADAR97♠♥K=+0