BERKOWITZ David · BERKSMA
43rank
+79.6Butler · 100 bds
+0.80per board
±4.4swing
+0.14vs par /bd · #223/527
+0.89adjusted /bd
by round
vs par split: bidding -0.58 · play +0.72
Strength of schedule: opponents averaged +0.09/bd (a tough draw) → opponent-adjusted +0.89/bd
Card play — on target: opening leads 81.1% #207 of 527 · declarer play 78.3% #200 of 527 · defence 85.7% #254 of 527
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 77.8% (9) | 82.1% (28) |
| Declarer play | 81.8% (11) | 75.0% (12) |
| Defence | 91.7% (12) | 84.1% (44) |
Opening leads by suit led: ♠ 88.9% (9) · ♥ 40.0% (5) · ♦ 100.0% (9) · ♣ 78.6% (14)
vs par by strain: NT -0.33 (30) · a suit +0.34 (70)
vs par by level: part-score -0.55 (44) · game +0.45 (47) · slam +1.89 (9)
By role: declaring +0.07/bd (-2.98 vs par · 44) · defending +1.37/bd (+2.59 vs par · 56)
By vulnerability: vulnerable +0.39/bd (-0.14 vs par · 51) · not vulnerable +1.22/bd (+0.43 vs par · 49)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round 1 | D.Berkowitz | B.Kutuk – O.Kizilok | Closed | 10 | -7.0 | -0.70 | -0.60 |
| Round 2 | L.Berkowitz | B.Aubonnet – C.Carde | Open | 10 | -2.0 | -0.20 | -2.70 |
| Round 3 | L.Berkowitz | J.Voldoire – D.Avon | Open | 10 | +0.2 | +0.02 | +0.00 |
| Round 4 | D.Berkowitz | M.Wortel – J.Hop | Open | 10 | +7.5 | +0.75 | -1.50 |
| Round 5 | D.Berkowitz | T.Davis – B.Mcguire | Open | 10 | +24.7 | +2.47 | +3.60 |
| Round 6 | L.Berkowitz | A.Babsch – U.Schreckenberger | Closed | 10 | +19.4 | +1.94 | +1.70 |
| Round 7 | L.Berkowitz | B.Marina – M.Stegaroiu | Open | 10 | +15.0 | +1.50 | +1.40 |
| Round 8 | D.Berkowitz | C.Puillet – Q.Robert | Closed | 10 | +12.8 | +1.28 | -1.20 |
| Round 9 | D.Berkowitz | R.Ritmeijer – M.Ticha | Open | 10 | -3.1 | -0.31 | -1.50 |
| Round 10 | L.Berkowitz | M.Ter Laare – L.Molle | Closed | 10 | +12.1 | +1.21 | +2.20 |
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 |
|---|---|---|---|---|---|---|---|
| +12.0 | Round 8 | PUILLET | 20 | 4♥ | ♠4 | -2 | +13 |
| +11.9 | Round 7 | PERSIANI | 5 | 6♥ | ♣6 | -1 | +13 |
| +10.8 | Round 4 | FERM | 7 | 6♥ | ♠8 | = | +1 |
| +10.7 | Round 5 | APACHE | 15 | 6♥ | ♣6 | -2 | +13 |
| +10.5 | Round 5 | APACHE | 17 | 2♠x | ♦3 | -4 | +9 |
| +9.7 | Round 10 | EMMER | 1 | 1♠x | ♦9 | = | +14 |
| +9.6 | Round 6 | EAV | 30 | 4♥ | ♣4 | -2 | +11 |
| +8.6 | Round 7 | PERSIANI | 7 | 6♦ | ♠2 | -1 | +12 |
| +8.5 | Round 6 | EAV | 25 | 4♥ | ♣8 | = | +11 |
| +7.5 | Round 6 | EAV | 22 | 4♠ | ♥K | = | +3 |
| +6.7 | Round 10 | EMMER | 8 | 4♥ | ♦3 | +3 | +14 |
| +6.1 | Round 8 | PUILLET | 13 | 4♠x | ♣5 | -1 | -7 |
| +5.8 | Round 5 | APACHE | 12 | 3NT | ♣4 | -4 | +11 |
| +5.5 | Round 3 | MIPIREDA | 25 | 3NT | ♦6 | -1 | +10 |
| +4.3 | Round 2 | ACDC | 12 | 6♠ | ♠6 | = | -11 |
| +3.8 | Round 1 | KIBE | 6 | 3NT | ♠2 | +1 | -12 |
| +3.8 | Round 1 | KIBE | 7 | 4♥ | ♦2 | -1 | +12 |
| +3.7 | Round 2 | ACDC | 18 | 4♥ | ♣4 | = | +11 |
| +3.7 | Round 10 | EMMER | 2 | 1NT | ♥5 | +1 | +6 |
| +3.4 | Round 2 | ACDC | 13 | 6♠ | ♠3 | = | +0 |
| +3.4 | Round 3 | MIPIREDA | 21 | 5♦ | ♣2 | -2 | +2 |
| +3.2 | Round 8 | PUILLET | 11 | 2♠ | ♦6 | = | +6 |
| +3.2 | Round 10 | EMMER | 6 | 1NT | ♠8 | = | +5 |
| +2.9 | Round 4 | FERM | 1 | 6♠ | ♥A | = | +0 |
| +2.9 | Round 6 | EAV | 26 | 3NT | ♦4 | -1 | +12 |
| +2.9 | Round 10 | EMMER | 9 | 2♥ | ♣10 | -3 | +1 |
| +2.6 | Round 3 | MIPIREDA | 29 | 2♠ | ♥K | +1 | +0 |
| +2.6 | Round 5 | APACHE | 14 | 3♦ | ♦8 | +1 | +1 |
| +2.6 | Round 9 | WILSON | 29 | 3♦ | ♠2 | -1 | -1 |
| +2.5 | Round 4 | FERM | 3 | 4♥ | ♣2 | -2 | -9 |
| +2.2 | Round 3 | MIPIREDA | 23 | 4♠ | ♥3 | +2 | +9 |
| +2.1 | Round 6 | EAV | 21 | 4♠ | ♦A | +1 | -11 |
| +2.1 | Round 6 | EAV | 27 | 2♥ | ♠6 | -4 | +2 |
| +2.0 | Round 1 | KIBE | 8 | 3♥ | ♣A | -1 | +3 |
| +2.0 | Round 7 | PERSIANI | 1 | 4♠ | ♦A | -1 | -2 |
| +1.9 | Round 8 | PUILLET | 15 | 3♣ | ♥2 | -1 | +0 |
| +1.7 | Round 4 | FERM | 2 | 3♥ | ♦A | -1 | +2 |
| +1.6 | Round 7 | PERSIANI | 10 | 2♦ | ♥4 | = | +2 |
| +1.6 | Round 9 | WILSON | 24 | 3NT | ♥8 | -1 | +5 |
| +1.5 | Round 3 | MIPIREDA | 24 | 4♠ | ♣8 | -1 | -2 |
| +1.4 | Round 10 | EMMER | 7 | 3♣x | ♦4 | -1 | +2 |
| +1.3 | Round 7 | PERSIANI | 2 | 1NT | ♠7 | -2 | +7 |
| +1.3 | Round 9 | WILSON | 25 | 1NT | ♣7 | -1 | -2 |
| +1.3 | Round 9 | WILSON | 28 | 3♥ | ♥3 | = | +0 |
| +1.2 | Round 9 | WILSON | 23 | 3NT | ♣3 | +2 | +0 |
| +1.1 | Round 8 | PUILLET | 12 | 3NT | ♣5 | +2 | +1 |
| +0.8 | Round 2 | ACDC | 20 | 1NT | ♠4 | = | +1 |
| +0.8 | Round 9 | WILSON | 26 | 2♦ | ♦8 | +1 | +0 |
| +0.5 | Round 4 | FERM | 5 | 3♥ | ♥3 | +1 | -6 |
| +0.5 | Round 4 | FERM | 6 | 2NT | ♦4 | +1 | +6 |
| +0.5 | Round 5 | APACHE | 13 | 3♥ | ♠2 | -1 | -1 |
| +0.4 | Round 2 | ACDC | 17 | 3NT | ♣Q | +1 | -1 |
| +0.3 | Round 3 | MIPIREDA | 28 | 2♥ | ♠A | -1 | +0 |
| +0.3 | Round 4 | FERM | 4 | 2♠ | ♦Q | -2 | +2 |
| +0.3 | Round 5 | APACHE | 11 | 3NT | ♥4 | +2 | +0 |
| +0.2 | Round 1 | KIBE | 1 | 3NT | ♥9 | +1 | -1 |
| +0.2 | Round 10 | EMMER | 10 | 4♠ | ♦3 | +1 | +0 |
| -0.1 | Round 1 | KIBE | 4 | 3♥ | ♣J | = | -11 |
| -0.2 | Round 2 | ACDC | 14 | 4♠ | ♥A | +1 | +0 |
| -0.3 | Round 2 | ACDC | 16 | 3♣ | ♠2 | = | -5 |
| -0.4 | Round 1 | KIBE | 10 | 4♠ | ♦7 | +2 | +13 |
| -0.5 | Round 3 | MIPIREDA | 26 | 1NT | ♠5 | = | -1 |
| -0.6 | Round 5 | APACHE | 19 | 3NT | ♦3 | +2 | +11 |
| -0.8 | Round 5 | APACHE | 16 | 1NT | ♦5 | -2 | -2 |
| -0.8 | Round 8 | PUILLET | 17 | 4♠ | ♥4 | +1 | +0 |
| -0.9 | Round 9 | WILSON | 22 | 4♠ | ♣K | = | +0 |
| -1.0 | Round 5 | APACHE | 20 | 4♠ | ♥A | +1 | -1 |
| -1.0 | Round 6 | EAV | 23 | 5♥x | ♠2 | -1 | +0 |
| -1.1 | Round 4 | FERM | 8 | 4♥ | ♣J | = | +0 |
| -1.1 | Round 8 | PUILLET | 18 | 4♠ | ♠5 | +1 | -11 |
| -1.2 | Round 8 | PUILLET | 14 | 3♥ | ♣5 | -1 | -2 |
| -1.4 | Round 2 | ACDC | 11 | 4♥ | ♠4 | = | -3 |
| -1.6 | Round 1 | KIBE | 5 | 3♣ | ♦7 | +1 | +0 |
| -1.7 | Round 1 | KIBE | 9 | 3NT | ♠K | = | +1 |
| -1.7 | Round 7 | PERSIANI | 4 | 3♥ | ♠4 | = | -7 |
| -1.7 | Round 7 | PERSIANI | 8 | 1NT | ♦Q | +2 | -7 |
| -1.8 | Round 3 | MIPIREDA | 27 | 3NT | ♠6 | -1 | -5 |
| -1.8 | Round 7 | PERSIANI | 6 | 3♦ | ♣A | = | -5 |
| -2.2 | Round 7 | PERSIANI | 9 | 1♥ | ♣4 | +1 | +1 |
| -2.2 | Round 8 | PUILLET | 16 | 3♣ | ♠A | -1 | -3 |
| -2.5 | Round 9 | WILSON | 30 | 4♥ | ♦A | +1 | +0 |
| -2.6 | Round 6 | EAV | 24 | 3NT | ♣7 | +1 | +0 |
| -2.9 | Round 10 | EMMER | 3 | 2♥ | ♦3 | +2 | +1 |
| -3.0 | Round 6 | EAV | 28 | 3NT | ♠10 | = | +0 |
| -3.0 | Round 7 | PERSIANI | 3 | 4♦ | ♣8 | = | +0 |
| -3.3 | Round 5 | APACHE | 18 | 3NT | ♣10 | -1 | -5 |
| -3.9 | Round 1 | KIBE | 2 | 3NT | ♠A | -2 | -11 |
| -3.9 | Round 3 | MIPIREDA | 30 | 3♥ | ♣K | = | -1 |
| -4.1 | Round 4 | FERM | 10 | 4♠ | ♥A | = | +1 |
| -4.1 | Round 9 | WILSON | 27 | 6NT | ♥10 | +1 | -11 |
| -4.2 | Round 10 | EMMER | 5 | 2♦ | ♦2 | -2 | -5 |
| -4.4 | Round 9 | WILSON | 21 | 2NT | ♣K | -3 | -6 |
| -6.1 | Round 2 | ACDC | 19 | 2NT | ♠9 | +1 | -10 |
| -6.2 | Round 8 | PUILLET | 19 | 4♦ | ♥8 | = | -9 |
| -6.5 | Round 4 | FERM | 9 | 3NT | ♦4 | -1 | -12 |
| -6.6 | Round 2 | ACDC | 15 | 5♠x | ♠6 | -3 | -9 |
| -6.7 | Round 6 | EAV | 29 | 3♦ | ♥Q | = | -11 |
| -8.6 | Round 10 | EMMER | 4 | 5♣ | ♥A | -1 | -16 |
| -9.1 | Round 1 | KIBE | 3 | 6♥ | ♠5 | = | +0 |
| -9.1 | Round 3 | MIPIREDA | 22 | 5♥ | ♣8 | -1 | -12 |