BERKOWITZ David · BERKSMA
vs par split: bidding -0.33 · play +0.44
Strength of schedule: opponents averaged -0.14/bd (an easy draw) → opponent-adjusted +0.18/bd
Card play — on target: opening leads 76.9% #19 of 31 · declarer play 77.8% #14 of 31 · defence 85.7% #23 of 31
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 75.0% (4) | 77.8% (9) |
| Declarer play | 33.3% (3) | 86.7% (15) |
| Defence | 90.0% (10) | 83.3% (18) |
Opening leads by suit led: ♠ 50.0% (2) · ♥ 100.0% (5) · ♦ 50.0% (2) · ♣ 75.0% (4)
vs par by strain: NT +1.64 (14) · a suit -0.02 (42)
vs par by level: part-score -0.71 (24) · game +1.21 (28) · slam +1.25 (4)
By role: declaring +0.18/bd (-1.37 vs par · 27) · defending +0.45/bd (+2.03 vs par · 29)
By vulnerability: vulnerable +1.57/bd (+1.32 vs par · 28) · not vulnerable -0.93/bd (-0.54 vs par · 28)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round of 16 | D.Berkowitz | K.Furuta – T.Nishimura | Closed | 14 | -16.8 | -1.20 | -1.36 |
| Round of 16 | L.Berkowitz | A.Miyakuni – K.Miyakuni | Open | 14 | +46.7 | +3.34 | +5.29 |
| Quarterfinal | D.Berkowitz | M.Nowosadzki – K.Dufrat | Closed | 14 | +11.1 | +0.79 | -0.07 |
| Quarterfinal | L.Berkowitz | M.Nowosadzki – K.Dufrat | Closed | 14 | -23.1 | -1.65 | -2.29 |
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 |
|---|---|---|---|---|---|---|---|
| +8.8 | Round of 16 | TAKK | 18 | 4♠ | ♦2 | +2 | +11 |
| +8.8 | Round of 16 | TAKK | 27 | 4♥ | ♠A | = | +11 |
| +8.4 | Round of 16 | TAKK | 20 | 6♣x | ♥A | -1 | +16 |
| +6.0 | Quarterfinal | SAKR | 13 | 5♣ | ♠A | = | -1 |
| +5.4 | Quarterfinal | SAKR | 25 | 4♠ | ♣3 | +1 | +1 |
| +5.2 | Round of 16 | TAKK | 26 | 4♠ | ♠5 | +2 | +5 |
| +4.7 | Round of 16 | TAKK | 5 | 6NT | ♣2 | +1 | +13 |
| +4.7 | Round of 16 | TAKK | 22 | 3NT | ♣10 | -1 | +12 |
| +4.6 | Quarterfinal | SAKR | 27 | 4♣ | ♠9 | +1 | +7 |
| +3.6 | Quarterfinal | SAKR | 6 | 1NT | ♦2 | -1 | +4 |
| +3.5 | Round of 16 | TAKK | 9 | 2♥ | ♣J | +1 | +6 |
| +3.5 | Round of 16 | TAKK | 21 | 2NT | ♣9 | = | +0 |
| +3.4 | Quarterfinal | SAKR | 16 | 4♠ | ♦K | +1 | +0 |
| +3.3 | Quarterfinal | SAKR | 9 | 3♣ | ♥A | -2 | +5 |
| +2.7 | Round of 16 | TAKK | 28 | 5♣ | ♥A | -1 | +5 |
| +2.5 | Round of 16 | TAKK | 23 | 5♣x | ♦3 | -1 | +7 |
| +2.3 | Quarterfinal | SAKR | 8 | 1NT | ♦5 | -2 | +0 |
| +1.9 | Round of 16 | TAKK | 16 | 4♠x | ♥A | -1 | +11 |
| +1.9 | Quarterfinal | SAKR | 11 | 4♥ | ♣J | +1 | +0 |
| +1.7 | Quarterfinal | SAKR | 10 | 1NT | ♣6 | = | -1 |
| +1.4 | Quarterfinal | SAKR | 12 | 3♦ | ♠K | -1 | +5 |
| +1.3 | Quarterfinal | SAKR | 23 | 4♠ | ♥6 | = | +0 |
| +1.1 | Round of 16 | TAKK | 6 | 3NT | ♥5 | -1 | +11 |
| +0.7 | Round of 16 | TAKK | 3 | 4♥ | ♠9 | +1 | +11 |
| +0.7 | Round of 16 | TAKK | 24 | 2♥ | ♣3 | = | +0 |
| +0.7 | Round of 16 | TAKK | 25 | 4♥ | ♣10 | = | +0 |
| +0.6 | Quarterfinal | SAKR | 3 | 2♠ | ♣9 | -1 | -1 |
| +0.6 | Quarterfinal | SAKR | 14 | 3♣ | ♦K | = | -1 |
| +0.4 | Round of 16 | TAKK | 4 | 2♥ | ♦4 | +2 | +1 |
| +0.3 | Round of 16 | TAKK | 7 | 2♠ | ♥9 | = | -10 |
| +0.3 | Round of 16 | TAKK | 17 | 3NT | ♣6 | +2 | +0 |
| +0.3 | Quarterfinal | SAKR | 26 | 4♥ | ♣2 | = | +0 |
| -0.0 | Quarterfinal | SAKR | 2 | 3NT | ♥2 | +1 | +1 |
| -0.0 | Quarterfinal | SAKR | 5 | 2♥ | ♣K | +1 | +0 |
| -0.3 | Quarterfinal | SAKR | 22 | 3♦ | ♥3 | +1 | +0 |
| -0.5 | Round of 16 | TAKK | 10 | 2♥ | ♦K | = | +0 |
| -0.7 | Round of 16 | TAKK | 1 | 2♠ | ♦A | +1 | -1 |
| -0.7 | Round of 16 | TAKK | 11 | 2♠ | ♥K | +1 | -4 |
| -0.7 | Round of 16 | TAKK | 19 | 2♠ | ♥8 | +1 | -1 |
| -0.7 | Quarterfinal | SAKR | 4 | 4♠ | ♣6 | +1 | +0 |
| -0.8 | Round of 16 | TAKK | 15 | 1NT | ♥2 | -1 | -3 |
| -1.3 | Quarterfinal | SAKR | 24 | 2♥ | ♣K | = | +0 |
| -1.4 | Quarterfinal | SAKR | 19 | 3NT | ♥2 | +1 | +0 |
| -1.5 | Round of 16 | TAKK | 14 | 3♦ | ♠A | = | -6 |
| -1.6 | Round of 16 | TAKK | 13 | 4♥ | ♦K | -1 | -7 |
| -1.7 | Quarterfinal | SAKR | 1 | 4♠ | ♦6 | +1 | +0 |
| -3.1 | Quarterfinal | SAKR | 17 | 3NT | ♥2 | = | +1 |
| -4.4 | Quarterfinal | SAKR | 18 | 3NT | ♦5 | +2 | -1 |
| -4.6 | Quarterfinal | SAKR | 15 | 4♥ | ♦J | = | -11 |
| -5.1 | Quarterfinal | SAKR | 28 | 3♥ | ♠2 | +1 | -6 |
| -5.6 | Round of 16 | TAKK | 12 | 2♣ | ♥9 | -3 | -11 |
| -5.6 | Quarterfinal | SAKR | 20 | 4♥ | ♣2 | +1 | -11 |
| -6.7 | Round of 16 | TAKK | 2 | 3NT | ♣6 | -1 | -14 |
| -7.9 | Quarterfinal | SAKR | 7 | 6♦ | ♠Q | -1 | -12 |
| -10.2 | Round of 16 | TAKK | 8 | 4♥ | ♣Q | = | -8 |
| -12.3 | Quarterfinal | SAKR | 21 | 6♥ | ♦9 | -4 | -12 |