COHEN Billy · MAHAFFEY
vs par split: bidding +0.94 · play -0.70
Strength of schedule: opponents averaged -0.04/bd (an average draw) → opponent-adjusted -0.01/bd
Card play — on target: opening leads 73.7% #252 of 476 · declarer play 56.2% #465 of 478 · defence 84.1% #297 of 478
| vs NT | vs a suit | |
|---|---|---|
| Opening leads | 50.0% (4) | 80.0% (15) |
| Declarer play | 50.0% (8) | 62.5% (8) |
| Defence | 87.5% (16) | 82.1% (28) |
Opening leads by suit led: ♠ 66.7% (3) · ♥ 66.7% (6) · ♦ 100.0% (2) · ♣ 75.0% (8)
vs par by strain: NT -0.62 (34) · a suit +0.87 (46)
vs par by level: part-score -0.52 (27) · game +0.40 (50) · slam +4.33 (3)
By role: declaring +0.48/bd (-1.19 vs par · 36) · defending -0.33/bd (+1.41 vs par · 44)
By vulnerability: vulnerable +0.29/bd (+0.38 vs par · 42) · not vulnerable -0.24/bd (+0.08 vs par · 38)
By round↑ top
| Round | Partner | Opponents | Room | Bds | Butler | Avg | vs par |
|---|---|---|---|---|---|---|---|
| Round 1 | G.Cohler | M.Suranyi – P.Talyigas | Closed | 10 | +14.4 | +1.44 | +3.00 |
| Round 2 | G.Cohler | P.Janiszewski – S.Golebiowski | Open | 10 | +0.0 | +0.00 | -0.60 |
| Round 3 | G.Cohler | G.Sun – Y.Zhang | Open | 10 | +5.6 | +0.56 | +0.70 |
| Round 4 | G.Cohler | J.Diamond – B.Platnick | Open | 10 | +1.7 | +0.17 | +0.80 |
| Round 6 | G.Cohler | D.Mossop – A.Hydes | Open | 10 | -11.4 | -1.14 | +0.90 |
| Round 8 | G.Cohler | C.Teodorescu – M.Ionita | Open | 10 | +0.7 | +0.07 | -1.80 |
| Round 9 | G.Cohler | G.Chagas – M.Villas-Boas | Closed | 10 | -8.2 | -0.82 | +0.50 |
| Round 10 | G.Cohler | M.Kamil – R.Coren | Closed | 10 | +0.2 | +0.02 | -1.60 |
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 |
|---|---|---|---|---|---|---|---|
| +13.6 | Round 9 | CHAGAS | 16 | 6♥x | ♠K | = | +13 |
| +12.2 | Round 3 | PD TIMES | 10 | 4♠ | ♦8 | = | +10 |
| +11.6 | Round 8 | COLDEA | 10 | 3NT | ♥3 | = | +12 |
| +10.1 | Round 1 | LOVEBRIDGE | 8 | 5♥x | ♦4 | -2 | +12 |
| +9.1 | Round 1 | LOVEBRIDGE | 4 | 4♥x | ♦K | -1 | +14 |
| +7.2 | Round 4 | DIAMOND | 19 | 4♥ | ♠A | +1 | +7 |
| +6.6 | Round 8 | COLDEA | 8 | 4♠ | ♥3 | -2 | +6 |
| +6.5 | Round 10 | STRUL | 22 | 4♥ | ♦4 | +1 | +0 |
| +6.4 | Round 1 | LOVEBRIDGE | 3 | 4♠ | ♥7 | +3 | +14 |
| +4.4 | Round 8 | COLDEA | 1 | 3NT | ♠3 | +1 | +7 |
| +4.1 | Round 4 | DIAMOND | 18 | 3♥ | ♣2 | -1 | +4 |
| +3.8 | Round 3 | PD TIMES | 2 | 4♠ | ♣A | -1 | +9 |
| +3.7 | Round 2 | ZAWADA | 15 | 4♥ | ♠A | +1 | +6 |
| +3.7 | Round 6 | MOSSOP | 5 | 4♥ | ♠3 | -1 | +5 |
| +3.5 | Round 9 | CHAGAS | 18 | 3♠ | ♥5 | -1 | +6 |
| +3.4 | Round 6 | MOSSOP | 1 | 2♥ | ♦10 | = | +0 |
| +3.3 | Round 6 | MOSSOP | 10 | 3NT | ♣3 | -2 | +8 |
| +2.9 | Round 4 | DIAMOND | 13 | 3♦ | ♦4 | -1 | +6 |
| +2.9 | Round 6 | MOSSOP | 3 | 4♠ | ♣2 | -1 | +5 |
| +2.8 | Round 6 | MOSSOP | 8 | 2♣ | ♣2 | = | +5 |
| +2.7 | Round 1 | LOVEBRIDGE | 5 | 3♦ | ♦4 | -2 | +7 |
| +2.5 | Round 1 | LOVEBRIDGE | 7 | 3NT | ♦7 | = | +0 |
| +2.2 | Round 6 | MOSSOP | 6 | 4♠ | ♣A | -1 | +4 |
| +1.8 | Round 2 | ZAWADA | 17 | 3NT | ♠9 | +1 | +0 |
| +1.8 | Round 9 | CHAGAS | 13 | 3NT | ♣9 | +2 | +0 |
| +1.7 | Round 10 | STRUL | 30 | 1NT | ♣9 | +1 | +1 |
| +1.6 | Round 2 | ZAWADA | 11 | 1NT | ♠8 | -3 | +1 |
| +1.6 | Round 4 | DIAMOND | 20 | 2♠ | ♦A | = | +5 |
| +1.5 | Round 2 | ZAWADA | 16 | 4♠ | ♥2 | +1 | +11 |
| +1.3 | Round 10 | STRUL | 23 | 5♦x | ♣K | -1 | +2 |
| +1.2 | Round 10 | STRUL | 24 | 6NT | ♣A | = | +0 |
| +0.9 | Round 10 | STRUL | 21 | 3NT | ♦5 | = | +0 |
| +0.7 | Round 2 | ZAWADA | 13 | 4♥ | ♦J | +1 | +0 |
| +0.7 | Round 3 | PD TIMES | 3 | 1NT | ♥3 | -1 | -3 |
| +0.6 | Round 1 | LOVEBRIDGE | 10 | 4♥ | ♠4 | = | +1 |
| +0.6 | Round 10 | STRUL | 29 | 3NT | ♣5 | = | +1 |
| +0.4 | Round 4 | DIAMOND | 16 | 1NT | ♥4 | -1 | +0 |
| +0.4 | Round 9 | CHAGAS | 19 | 1NT | ♥Q | +1 | +0 |
| +0.1 | Round 3 | PD TIMES | 7 | 3NT | ♦3 | +1 | +0 |
| -0.0 | Round 2 | ZAWADA | 12 | 2♥ | ♣Q | = | +1 |
| -0.0 | Round 3 | PD TIMES | 9 | 3NT | ♠5 | = | -1 |
| -0.1 | Round 2 | ZAWADA | 18 | 3NT | ♠Q | +1 | +0 |
| -0.1 | Round 3 | PD TIMES | 4 | 1NT | ♦K | = | -1 |
| -0.3 | Round 8 | COLDEA | 9 | 2♠ | ♥3 | +2 | -1 |
| -0.5 | Round 8 | COLDEA | 6 | 3NT | ♦3 | = | +0 |
| -0.8 | Round 10 | STRUL | 25 | 3NT | ♥6 | +2 | +0 |
| -0.9 | Round 3 | PD TIMES | 8 | 3♣ | ♣5 | -1 | +2 |
| -1.0 | Round 2 | ZAWADA | 19 | 4♠ | ♣J | -1 | -12 |
| -1.1 | Round 9 | CHAGAS | 20 | 3NT | ♥4 | +3 | +13 |
| -1.4 | Round 9 | CHAGAS | 12 | 6NT | ♠4 | = | +0 |
| -1.6 | Round 10 | STRUL | 28 | 2♠ | ♥A | = | +0 |
| -1.7 | Round 3 | PD TIMES | 5 | 2♥ | ♦K | = | +0 |
| -1.9 | Round 1 | LOVEBRIDGE | 2 | 3♥ | ♦10 | = | +0 |
| -1.9 | Round 3 | PD TIMES | 1 | 1NT | ♣4 | +1 | +0 |
| -1.9 | Round 9 | CHAGAS | 11 | 3NT | ♣J | = | +1 |
| -2.0 | Round 6 | MOSSOP | 9 | 1NT | ♠5 | -1 | +0 |
| -2.4 | Round 2 | ZAWADA | 14 | 2♥ | ♣5 | = | -5 |
| -2.6 | Round 4 | DIAMOND | 11 | 4♣ | ♦K | +1 | -7 |
| -2.6 | Round 4 | DIAMOND | 12 | 3♦ | ♣7 | = | -5 |
| -2.7 | Round 4 | DIAMOND | 14 | 3NT | ♦4 | = | +0 |
| -2.7 | Round 8 | COLDEA | 5 | 3NT | ♥K | +2 | +0 |
| -3.1 | Round 8 | COLDEA | 4 | 4♥ | ♦5 | -1 | -6 |
| -3.1 | Round 10 | STRUL | 27 | 4♥ | ♥2 | -1 | -10 |
| -3.3 | Round 4 | DIAMOND | 15 | 5♦ | ♠2 | +1 | -1 |
| -3.3 | Round 4 | DIAMOND | 17 | 3NT | ♦4 | +2 | -1 |
| -3.8 | Round 1 | LOVEBRIDGE | 1 | 4♠ | ♦10 | -1 | -5 |
| -4.1 | Round 8 | COLDEA | 3 | 3NT | ♦3 | -2 | -13 |
| -4.2 | Round 9 | CHAGAS | 15 | 5♥x | ♠K | -1 | -6 |
| -5.4 | Round 8 | COLDEA | 7 | 3NT | ♣K | -1 | -12 |
| -5.5 | Round 1 | LOVEBRIDGE | 6 | 2NT | ♣3 | +3 | -9 |
| -5.8 | Round 1 | LOVEBRIDGE | 9 | 5♦x | ♣7 | = | -4 |
| -5.8 | Round 2 | ZAWADA | 20 | 3NT | ♥5 | -2 | -8 |
| -5.8 | Round 8 | COLDEA | 2 | 3♠ | ♣3 | = | -11 |
| -5.8 | Round 9 | CHAGAS | 14 | 3NT | ♦8 | -4 | -8 |
| -6.5 | Round 10 | STRUL | 26 | 2♠ | ♥A | +1 | -10 |
| -6.6 | Round 3 | PD TIMES | 6 | 3NT | ♦3 | -3 | -9 |
| -7.6 | Round 6 | MOSSOP | 2 | 5♦x | ♣2 | = | -6 |
| -9.4 | Round 6 | MOSSOP | 4 | 5♦ | ♠Q | +1 | -1 |
| -10.7 | Round 6 | MOSSOP | 7 | 4♥ | ♣2 | +1 | -11 |
| -13.1 | Round 9 | CHAGAS | 17 | 5♠x | ♣K | -3 | -14 |