🇺🇸 BERKOWITZ David · USA 2
46rank
-47.6Butler · 64 bds
-0.74per board
±4.9swing
-0.25vs par /bd
-0.94adjusted /bd
by round
vs par split: bidding -0.63 · play +0.38
Strength of schedule: opponents averaged -0.19/bd (an easy draw) → opponent-adjusted -0.94/bd
Card play — on target: opening leads 76.2% · declarer play 60.0% · defence 83.8%
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 60.0% (5) | 81.2% (16) |
| Declarer play | 60.0% (5) | 60.0% (5) |
| Defence | 81.8% (11) | 84.6% (26) |
Opening leads by suit led: ♠ 87.5% (8) · ♥ 100.0% (2) · ♦ 42.9% (7) · ♣ 100.0% (4)
vs par by strain: NT -0.26 (23) · a suit -0.24 (41)
vs par by level: part-score -0.22 (23) · game -0.36 (36) · slam +0.40 (5)
By role: declaring +1.01/bd (-1.58 vs par · 26) · defending -1.95/bd (+0.66 vs par · 38)
By vulnerability: vulnerable -0.43/bd (-0.16 vs par · 32) · not vulnerable -1.06/bd (-0.34 vs par · 32)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Quarterfinal | A.Sontag | F.Ten Brink – H.De Vrind | Open | 16 | -13.6 | -0.85 | +0.81 |
| Quarterfinal | A.Sontag | B.Van Der Hoek – L.Hofland | Open | 16 | -3.3 | -0.21 | -2.50 |
| Quarterfinal | A.Sontag | H.Vergoed – A.Mulder | Open | 16 | -34.6 | -2.16 | -0.38 |
| Quarterfinal | A.Sontag | A.Mulder – H.Vergoed | Closed | 16 | +3.9 | +0.24 | +1.06 |
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 |
|---|---|---|---|---|---|---|---|
| +11.1 | Quarterfinal | 🇳🇱 NETHERLANDS | 44 | 3NT | ♥K | = | -1 |
| +8.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 53 | 4♥ | ♣3 | -1 | +10 |
| +8.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 91 | 3NT | ♥K | = | +6 |
| +7.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 62 | 4♠ | ♣8 | -1 | +10 |
| +6.7 | Quarterfinal | 🇳🇱 NETHERLANDS | 61 | 3NT | ♠J | +2 | +2 |
| +5.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 42 | 2♠ | ♥K | = | +0 |
| +5.6 | Quarterfinal | 🇳🇱 NETHERLANDS | 34 | 1NT | ♣K | = | -1 |
| +4.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 84 | 2NT | ♣6 | -2 | +7 |
| +3.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 58 | 2♠ | ♣6 | = | +12 |
| +3.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 15 | 3NT | ♦6 | +1 | +11 |
| +2.7 | Quarterfinal | 🇳🇱 NETHERLANDS | 86 | 4♠ | ♥2 | -1 | +10 |
| +2.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 14 | 3♠ | ♦10 | = | +1 |
| +2.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 81 | 2♠ | ♣4 | -1 | +4 |
| +2.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 87 | 2♣ | ♥2 | -1 | -1 |
| +2.1 | Quarterfinal | 🇳🇱 NETHERLANDS | 49 | 3♠ | ♦9 | = | +0 |
| +1.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 85 | 3NT | ♠3 | -2 | +7 |
| +1.7 | Quarterfinal | 🇳🇱 NETHERLANDS | 2 | 2♠ | ♦A | +1 | -1 |
| +1.6 | Quarterfinal | 🇳🇱 NETHERLANDS | 4 | 5♣ | ♥7 | -1 | +6 |
| +1.6 | Quarterfinal | 🇳🇱 NETHERLANDS | 10 | 2♠ | ♣6 | = | -1 |
| +1.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 94 | 6♥ | ♦3 | = | -11 |
| +1.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 45 | 4♥ | ♠A | +1 | +0 |
| +1.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 95 | 2♥ | ♣3 | +2 | -7 |
| +1.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 59 | 4♠ | ♣7 | = | +0 |
| +0.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 51 | 3NT | ♥5 | +2 | +0 |
| +0.6 | Quarterfinal | 🇳🇱 NETHERLANDS | 35 | 3NT | ♠10 | +2 | +0 |
| +0.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 7 | 2♠ | ♦10 | -1 | +0 |
| +0.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 36 | 3NT | ♥3 | +2 | -13 |
| +0.1 | Quarterfinal | 🇳🇱 NETHERLANDS | 9 | 1NT | ♣5 | +2 | -6 |
| +0.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 1 | 3♦ | ♠A | -1 | +3 |
| +0.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 48 | 3NT | ♠8 | +2 | +0 |
| +0.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 63 | 3NT | ♠3 | +2 | -1 |
| -0.1 | Quarterfinal | 🇳🇱 NETHERLANDS | 90 | 2♠ | ♠3 | -1 | -1 |
| -0.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 5 | 3NT | ♦6 | = | +0 |
| -0.6 | Quarterfinal | 🇳🇱 NETHERLANDS | 41 | 3NT | ♦2 | = | +0 |
| -0.6 | Quarterfinal | 🇳🇱 NETHERLANDS | 43 | 2NT | ♠10 | -2 | +0 |
| -0.7 | Quarterfinal | 🇳🇱 NETHERLANDS | 40 | 3NT | ♣9 | +1 | -1 |
| -0.7 | Quarterfinal | 🇳🇱 NETHERLANDS | 93 | 3NT | ♥6 | +1 | -4 |
| -1.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 92 | 2♦ | ♥A | -2 | +1 |
| -1.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 6 | 4♥ | ♣9 | -1 | +12 |
| -1.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 38 | 3♥ | ♠K | +1 | -1 |
| -1.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 96 | 3♣ | ♠7 | = | +0 |
| -1.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 13 | 5♦ | ♥A | -1 | +9 |
| -1.6 | Quarterfinal | 🇳🇱 NETHERLANDS | 16 | 2♠ | ♣4 | +2 | +1 |
| -1.7 | Quarterfinal | 🇳🇱 NETHERLANDS | 83 | 3♥ | ♦5 | +2 | -7 |
| -1.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 11 | 4♦ | ♠7 | -2 | -8 |
| -2.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 64 | 4♠ | ♠3 | = | +0 |
| -3.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 57 | 4♥ | ♠Q | +1 | -14 |
| -4.1 | Quarterfinal | 🇳🇱 NETHERLANDS | 47 | 4♥ | ♦6 | +1 | -17 |
| -4.1 | Quarterfinal | 🇳🇱 NETHERLANDS | 88 | 3NT | ♦Q | = | +0 |
| -4.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 39 | 3♠ | ♦Q | = | +0 |
| -4.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 12 | 3NT | ♠3 | -1 | -5 |
| -4.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 37 | 4♠ | ♦K | -1 | -5 |
| -4.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 82 | 6♥ | ♦J | = | +13 |
| -5.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 33 | 4♠ | ♥2 | = | -1 |
| -6.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 8 | 5♦ | ♠Q | -2 | -6 |
| -6.7 | Quarterfinal | 🇳🇱 NETHERLANDS | 89 | 7♥ | ♥3 | = | +0 |
| -7.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 56 | 4♥ | ♠K | = | +0 |
| -7.0 | Quarterfinal | 🇳🇱 NETHERLANDS | 60 | 5♥x | ♣3 | +1 | -7 |
| -7.1 | Quarterfinal | 🇳🇱 NETHERLANDS | 46 | 3NT | ♦2 | = | +0 |
| -7.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 3 | 4♥ | ♠A | = | -3 |
| -7.9 | Quarterfinal | 🇳🇱 NETHERLANDS | 54 | 5♦ | ♠8 | = | -11 |
| -9.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 50 | 3NT | ♦8 | +1 | -7 |
| -12.3 | Quarterfinal | 🇳🇱 NETHERLANDS | 55 | 6♠ | ♦A | = | +0 |
| -16.4 | Quarterfinal | 🇳🇱 NETHERLANDS | 52 | 6NT | ♠10 | = | +0 |