BERKOWITZ David · USA 2 Seniors
vs par split: bidding -0.70 · play -0.27
Strength of schedule: opponents averaged +0.25/bd (a tough draw) → opponent-adjusted -0.67/bd
Card play — on target: opening leads 80.0% · declarer play 80.0% · defence 86.7%
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 100.0% (1) | 75.0% (4) |
| Declarer play | 100.0% (1) | 75.0% (4) |
| Defence | 66.7% (3) | 91.7% (12) |
Opening leads by suit led: ♥ 100.0% (2) · ♦ 50.0% (2) · ♣ 100.0% (1)
vs par by strain: NT -2.00 (6) · a suit -0.71 (24)
vs par by level: part-score +0.23 (13) · game -3.07 (14) · slam +3.67 (3)
By role: declaring -0.50/bd (-1.93 vs par · 15) · defending -1.35/bd (+0.00 vs par · 15)
By vulnerability: vulnerable -1.09/bd (-1.29 vs par · 14) · not vulnerable -0.78/bd (-0.69 vs par · 16)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round 11 | A.Sontag | K.Wang – J.Kang | Closed | 10 | +5.6 | +0.56 | +1.20 |
| Round 12 | A.Sontag | M.Whibley – M.Brown | Closed | 10 | -21.0 | -2.10 | -1.30 |
| Round 13 | A.Sontag | S.Roh – D.Kim | Closed | 10 | -12.3 | -1.23 | -2.80 |
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 |
|---|---|---|---|---|---|---|---|
| +11.5 | Round 12 | NEW ZEALAND Open | 22 | 6♣ | ♦J | -1 | +14 |
| +6.9 | Round 13 | SEOUL OPEN | 6 | 4♥ | ♠6 | +1 | +1 |
| +4.0 | Round 11 | CHINA HUOCHETOU | 19 | 3NT | ♦2 | = | +0 |
| +3.5 | Round 13 | SEOUL OPEN | 1 | 4♥ | ♦Q | = | +0 |
| +2.5 | Round 11 | CHINA HUOCHETOU | 15 | 2♠ | ♥8 | +2 | +10 |
| +2.4 | Round 11 | CHINA HUOCHETOU | 11 | 4♠x | ♦J | -2 | +5 |
| +1.9 | Round 12 | NEW ZEALAND Open | 21 | 3♦ | ♥A | -2 | +3 |
| +1.4 | Round 11 | CHINA HUOCHETOU | 12 | 4♥ | ♦J | = | +0 |
| +1.3 | Round 11 | CHINA HUOCHETOU | 14 | 3♣ | ♣J | +1 | +0 |
| +1.2 | Round 11 | CHINA HUOCHETOU | 17 | 3♥ | ♠2 | -1 | +8 |
| +1.2 | Round 12 | NEW ZEALAND Open | 23 | 3♥ | ♥9 | +1 | +1 |
| +0.9 | Round 13 | SEOUL OPEN | 9 | 3NT | ♥5 | +2 | +2 |
| +0.4 | Round 11 | CHINA HUOCHETOU | 20 | 2♠ | ♦5 | = | +0 |
| -0.2 | Round 11 | CHINA HUOCHETOU | 18 | 2♠ | ♣2 | = | +0 |
| -0.2 | Round 13 | SEOUL OPEN | 7 | 3NT | ♥Q | = | +2 |
| -0.7 | Round 12 | NEW ZEALAND Open | 26 | 2♣ | ♠3 | = | -2 |
| -0.9 | Round 13 | SEOUL OPEN | 4 | 3♣ | ♥4 | -1 | +0 |
| -1.4 | Round 12 | NEW ZEALAND Open | 30 | 2NT | ♦J | -1 | -5 |
| -2.2 | Round 11 | CHINA HUOCHETOU | 16 | 3♥ | ♦A | +1 | -1 |
| -2.7 | Round 13 | SEOUL OPEN | 10 | 3♠ | ♣4 | -1 | +1 |
| -3.3 | Round 13 | SEOUL OPEN | 2 | 2♠ | ♣2 | = | -12 |
| -3.4 | Round 12 | NEW ZEALAND Open | 25 | 6♥ | ♥2 | +1 | +11 |
| -4.3 | Round 13 | SEOUL OPEN | 5 | 4♥ | ♠8 | = | -11 |
| -5.2 | Round 11 | CHINA HUOCHETOU | 13 | 4♥ | ♠7 | = | -10 |
| -5.6 | Round 12 | NEW ZEALAND Open | 27 | 4♠ | ♥J | -1 | -10 |
| -5.9 | Round 12 | NEW ZEALAND Open | 24 | 4♠ | ♣A | +1 | +0 |
| -6.0 | Round 13 | SEOUL OPEN | 8 | 5♦ | ♣J | +1 | -11 |
| -6.2 | Round 13 | SEOUL OPEN | 3 | 3NT | ♣J | +1 | +0 |
| -9.1 | Round 12 | NEW ZEALAND Open | 28 | 6♥ | ♣7 | -2 | -14 |
| -9.5 | Round 12 | NEW ZEALAND Open | 29 | 3NT | ♣6 | +1 | -11 |