BERKOWITZ David · SANBORN
277rank
-27.4Butler · 100 bds
-0.27per board
±4.3swing
-0.81vs par /bd · #321/379
-0.34adjusted /bd
by round
vs par split: bidding -0.74 · play -0.11
Strength of schedule: opponents averaged -0.06/bd (an easy draw) → opponent-adjusted -0.34/bd
Card play — on target: opening leads 88.5% #78 of 379 · declarer play 73.3% #174 of 379 · defence 83.0% #234 of 379
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 75.0% (8) | 94.4% (18) |
| Declarer play | 69.2% (13) | 76.5% (17) |
| Defence | 85.7% (14) | 81.8% (33) |
Opening leads by suit led: ♠ 100.0% (2) · ♥ 100.0% (3) · ♦ 85.7% (7) · ♣ 85.7% (14)
vs par by strain: NT +0.35 (34) · a suit -1.48 (65)
vs par by level: part-score +0.57 (37) · game -1.75 (60) · slam +0.00 (2)
By role: declaring -0.61/bd (-3.17 vs par · 52) · defending +0.09/bd (+1.75 vs par · 48)
By vulnerability: vulnerable -0.92/bd (-1.16 vs par · 51) · not vulnerable +0.39/bd (-0.45 vs par · 49)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round 1 | L.Berkowitz | R.Sjodal – E.Sjodal | Closed | 10 | -27.5 | -2.75 | -5.40 |
| Round 2 | L.Berkowitz | R.Solum – O.Garvik | Open | 10 | +23.5 | +2.35 | +4.10 |
| Round 3 | L.Berkowitz | S.Thoresen – T.Hoiland | Open | 10 | -2.5 | -0.25 | -1.10 |
| Round 4 | L.Berkowitz | D.Hoffman – S.Picus | Open | 10 | -8.9 | -0.89 | +0.90 |
| Round 5 | L.Berkowitz | A.Gunnarsson – E.Hagen | Closed | 10 | -9.3 | -0.93 | -3.80 |
| Round 6 | L.Berkowitz | G.Helgemo – A.Langeland | Open | 10 | +5.8 | +0.58 | +0.10 |
| Round 7 | L.Berkowitz | T.De Mendez – S.Bragadir | Closed | 10 | +4.8 | +0.48 | -0.60 |
| Round 8 | L.Berkowitz | V.Vainikonis – A.Gulevich | Open | 10 | -2.2 | -0.22 | -0.10 |
| Round 9 | L.Berkowitz | S.Sun – S.Wu | Open | 10 | -3.9 | -0.39 | -2.30 |
| Round 10 | L.Berkowitz | R.Frenkel – H.Sawicki | Closed | 10 | -7.2 | -0.72 | +0.10 |
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 |
|---|---|---|---|---|---|---|---|
| +10.4 | Round 2 | PASS O DOUBLE | 13 | 4♠x | ♦4 | = | +12 |
| +9.0 | Round 9 | BEIJING TRINERGY | 28 | 6♠ | ♥9 | = | +11 |
| +8.6 | Round 2 | PASS O DOUBLE | 15 | 4♠ | ♥A | -4 | +14 |
| +8.5 | Round 3 | THORESEN | 27 | 3NT | ♥K | +2 | +2 |
| +7.8 | Round 9 | BEIJING TRINERGY | 21 | 5♠x | ♣J | -1 | +11 |
| +7.6 | Round 10 | MELBOURNE 1 | 3 | 3NT | ♥Q | -1 | +11 |
| +6.9 | Round 2 | PASS O DOUBLE | 16 | 2♠ | ♥A | = | +11 |
| +5.6 | Round 2 | PASS O DOUBLE | 18 | 3♦ | ♥9 | = | +5 |
| +5.5 | Round 6 | FUGLESTAD | 26 | 4♠ | ♣4 | -2 | +2 |
| +5.2 | Round 8 | VYTAS | 16 | 3NT | ♦J | = | +11 |
| +4.8 | Round 3 | THORESEN | 24 | 3NT | ♦3 | -2 | +6 |
| +4.8 | Round 4 | HOFFMAN | 2 | 1NT | ♣7 | -2 | +3 |
| +4.4 | Round 6 | FUGLESTAD | 21 | 3NT | ♣5 | -2 | +7 |
| +4.2 | Round 7 | ZEN | 1 | 4♠ | ♠6 | -1 | +10 |
| +4.0 | Round 3 | THORESEN | 21 | 3NT | ♦10 | = | -1 |
| +3.7 | Round 9 | BEIJING TRINERGY | 23 | 4♦ | ♣A | +1 | +10 |
| +2.7 | Round 2 | PASS O DOUBLE | 12 | 3NT | ♠5 | +2 | +1 |
| +2.6 | Round 2 | PASS O DOUBLE | 19 | 2♦ | ♦4 | +1 | +6 |
| +2.6 | Round 5 | TEAM ATLANTIC | 11 | 6♦ | ♠9 | +1 | -11 |
| +2.5 | Round 7 | ZEN | 8 | 3NT | ♥9 | +1 | +0 |
| +2.3 | Round 3 | THORESEN | 26 | Pass | +3 | ||
| +2.1 | Round 7 | ZEN | 4 | 1NT | ♥2 | +1 | +1 |
| +2.0 | Round 6 | FUGLESTAD | 25 | 1NT | ♦5 | +1 | +7 |
| +2.0 | Round 7 | ZEN | 10 | 3NT | ♥Q | +1 | -1 |
| +1.9 | Round 4 | HOFFMAN | 5 | 3♥ | ♠3 | = | +10 |
| +1.9 | Round 10 | MELBOURNE 1 | 6 | 4♠ | ♣6 | +1 | +8 |
| +1.8 | Round 8 | VYTAS | 13 | 2♦x | ♥3 | -1 | +3 |
| +1.7 | Round 4 | HOFFMAN | 8 | 2♠ | ♣A | +1 | +1 |
| +1.7 | Round 6 | FUGLESTAD | 24 | 2♠ | ♣7 | -2 | +5 |
| +1.6 | Round 4 | HOFFMAN | 7 | 3NT | ♣7 | = | +17 |
| +1.6 | Round 5 | TEAM ATLANTIC | 20 | 3NT | ♠Q | +1 | +0 |
| +1.5 | Round 8 | VYTAS | 18 | 4♠ | ♦Q | +1 | +0 |
| +1.4 | Round 8 | VYTAS | 14 | 3NT | ♣10 | -2 | +5 |
| +1.3 | Round 1 | SJODAL | 7 | 3♠ | ♥J | -1 | -1 |
| +1.3 | Round 10 | MELBOURNE 1 | 8 | 1NT | ♥6 | -1 | +4 |
| +1.2 | Round 5 | TEAM ATLANTIC | 17 | 2♠ | ♦Q | = | +7 |
| +1.1 | Round 1 | SJODAL | 8 | 2♥ | ♣J | +1 | +1 |
| +1.1 | Round 4 | HOFFMAN | 6 | 3NT | ♠3 | = | +3 |
| +1.1 | Round 7 | ZEN | 5 | 4♥ | ♦2 | +2 | -11 |
| +1.1 | Round 8 | VYTAS | 12 | 3♦ | ♦3 | +1 | +0 |
| +1.0 | Round 3 | THORESEN | 29 | 1NT | ♦5 | -1 | +0 |
| +0.9 | Round 5 | TEAM ATLANTIC | 19 | 1NT | ♥7 | -1 | +0 |
| +0.9 | Round 7 | ZEN | 2 | 3NT | ♣7 | +2 | +0 |
| +0.9 | Round 10 | MELBOURNE 1 | 10 | 4♥ | ♠6 | +1 | +0 |
| +0.8 | Round 10 | MELBOURNE 1 | 5 | 1NT | ♦6 | -2 | +2 |
| +0.7 | Round 6 | FUGLESTAD | 23 | 3NT | ♦J | = | -2 |
| +0.7 | Round 6 | FUGLESTAD | 29 | 2♠ | ♦2 | = | +0 |
| +0.5 | Round 5 | TEAM ATLANTIC | 18 | 4♥ | ♣2 | +1 | +0 |
| +0.5 | Round 10 | MELBOURNE 1 | 4 | 2♥ | ♣3 | +1 | +0 |
| +0.2 | Round 2 | PASS O DOUBLE | 14 | 3♣ | ♠9 | +1 | +7 |
| +0.1 | Round 6 | FUGLESTAD | 28 | 3NT | ♣3 | = | -1 |
| +0.1 | Round 7 | ZEN | 3 | 2♥ | ♣A | -2 | +0 |
| -0.2 | Round 1 | SJODAL | 6 | 4♥ | ♠8 | = | -13 |
| -0.2 | Round 1 | SJODAL | 9 | 5♠x | ♣K | -3 | +0 |
| -0.4 | Round 5 | TEAM ATLANTIC | 13 | 5♥x | ♦K | -1 | -10 |
| -0.4 | Round 5 | TEAM ATLANTIC | 16 | 2♥ | ♦10 | -1 | -5 |
| -0.5 | Round 7 | ZEN | 6 | 4♣ | ♠K | = | +0 |
| -0.5 | Round 9 | BEIJING TRINERGY | 24 | 3♣ | ♦A | -3 | -7 |
| -0.6 | Round 8 | VYTAS | 17 | 3NT | ♥4 | = | -11 |
| -0.7 | Round 1 | SJODAL | 5 | 4♠ | ♥7 | = | -11 |
| -1.0 | Round 3 | THORESEN | 25 | 4♥ | ♠K | = | +0 |
| -1.1 | Round 4 | HOFFMAN | 1 | 4♠ | ♣10 | = | +0 |
| -1.1 | Round 9 | BEIJING TRINERGY | 29 | 5♥ | ♣10 | = | +0 |
| -1.2 | Round 3 | THORESEN | 28 | 2NT | ♠10 | -2 | +1 |
| -1.4 | Round 8 | VYTAS | 19 | 4♠ | ♣2 | -2 | +5 |
| -1.5 | Round 3 | THORESEN | 22 | 2♠ | ♦A | +1 | +0 |
| -1.7 | Round 4 | HOFFMAN | 4 | 3NT | ♣Q | +2 | -1 |
| -1.8 | Round 1 | SJODAL | 1 | 4♥ | ♦5 | = | +1 |
| -1.8 | Round 10 | MELBOURNE 1 | 2 | 3NT | ♣6 | +2 | +0 |
| -2.0 | Round 1 | SJODAL | 2 | 4♠ | ♠6 | -2 | -6 |
| -2.1 | Round 8 | VYTAS | 15 | 2♠ | ♦4 | -1 | -1 |
| -2.5 | Round 2 | PASS O DOUBLE | 20 | 2♥ | ♠9 | = | +0 |
| -2.7 | Round 6 | FUGLESTAD | 27 | 5♣ | ♥6 | -1 | -5 |
| -2.9 | Round 6 | FUGLESTAD | 22 | 4♠ | ♣A | -1 | -6 |
| -3.1 | Round 9 | BEIJING TRINERGY | 26 | 3NT | ♥7 | -1 | -13 |
| -3.5 | Round 5 | TEAM ATLANTIC | 14 | 2♠ | ♣10 | -1 | -8 |
| -3.5 | Round 8 | VYTAS | 11 | 3NT | ♣A | -1 | -10 |
| -3.5 | Round 10 | MELBOURNE 1 | 7 | 5♣ | ♥6 | -1 | -6 |
| -3.6 | Round 7 | ZEN | 9 | 4♥ | ♣Q | = | +0 |
| -3.6 | Round 9 | BEIJING TRINERGY | 22 | 4NT | ♦A | -2 | -13 |
| -3.7 | Round 6 | FUGLESTAD | 30 | 2♠ | ♣K | = | -6 |
| -3.9 | Round 9 | BEIJING TRINERGY | 27 | 4♥ | ♣A | = | -8 |
| -4.0 | Round 7 | ZEN | 7 | 3♣ | ♥2 | -1 | -5 |
| -4.4 | Round 4 | HOFFMAN | 3 | 4♠ | ♦Q | -2 | -8 |
| -4.6 | Round 5 | TEAM ATLANTIC | 15 | 4♠ | ♣3 | +2 | -11 |
| -4.8 | Round 9 | BEIJING TRINERGY | 30 | 2♠ | ♥K | +1 | -1 |
| -4.8 | Round 10 | MELBOURNE 1 | 1 | 5♣x | ♥A | -3 | -2 |
| -5.2 | Round 2 | PASS O DOUBLE | 11 | 5♦ | ♥5 | -1 | -14 |
| -5.2 | Round 3 | THORESEN | 30 | 4♥ | ♦K | -1 | -10 |
| -5.6 | Round 8 | VYTAS | 20 | 4♥ | ♦10 | = | -3 |
| -5.8 | Round 2 | PASS O DOUBLE | 17 | 3NT | ♦7 | +1 | -1 |
| -6.1 | Round 4 | HOFFMAN | 10 | 2♠ | ♦6 | -2 | -8 |
| -6.7 | Round 4 | HOFFMAN | 9 | 3NT | ♥9 | -2 | -8 |
| -6.9 | Round 1 | SJODAL | 3 | 3NT | ♥4 | -2 | -7 |
| -6.9 | Round 1 | SJODAL | 4 | 3♣ | ♥2 | -3 | -5 |
| -7.2 | Round 5 | TEAM ATLANTIC | 12 | 3NT | ♥2 | = | +0 |
| -7.4 | Round 9 | BEIJING TRINERGY | 25 | 4♠x | ♣A | -2 | -13 |
| -10.1 | Round 10 | MELBOURNE 1 | 9 | 2♦ | ♣6 | +1 | -16 |
| -11.2 | Round 1 | SJODAL | 10 | 5♣ | ♠A | -1 | -13 |
| -14.2 | Round 3 | THORESEN | 23 | 4♥x | ♦Q | -4 | -12 |