Board 15 of the round 3C (3rd set of 16 boards) produced a large swing on an opening lead against 6♦.
This session was the same as the 14th round of the Bermuda Bowl/Venice Cup/d'Orsi Senior Trophy. You can see the human results here
| Board 15 Dealer: South Vul: N/S |
♠ A J 4 ♥ A 4 ♦ A Q 10 9 8 5 4 ♣ 2 |
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♠ 10 9 7 2
♥ Q J 8 2 ♦ J 7 6 ♣ 10 7 |
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♠ 8 6 5
♥ K 7 6 5 3 ♦ — ♣ A Q 6 5 4 |
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| ♠ K Q 3 ♥ 10 9 ♦ K 3 2 ♣ K J 9 8 3 |
| West | North | East | South |
| Q-Plus | WBridge5 | Q-Plus | WBridge5 |
| 1 ♣ | |||
| Pass | 2 ♦ | Pass | 2 NT |
| Pass | 4 ♦ | Pass | 4 ♠ |
| Pass | 4 NT | Pass | 5 ♦1 |
| Pass | 6 ♦ | Pass | Pass |
| Pass |
| 1 one key card |
| West | North | East | South |
| WBridge5 | Q-Plus | WBridge5 | Q-Plus |
| 1 ♣ | |||
| Pass | 2 ♦ | Pass | 3 ♦ |
| Pass | 4 ♣1 | Pass | 4 ♠2 |
| Pass | 4 NT | Pass | 5 ♦3 |
| Pass | 6 ♦ | Pass | Pass |
| Pass |
opening lead, ♣ A
In the WBridge5 versus Q-Plus Bridge match, on the auctions both could have gotten it right with an aggressive heart lead, as at both tables first and second round controls were bid up the line. You be the judge.
In the human championships, 6♦ was reached at many tables, and for the big clubbers with South as declarer. When South was declarer, West led a heart more often than not, but with North as declarer, the opposite was true. The human play (except in Daily Bulletin articles) is not revealed, so the opening lead cannot be analyzed.
The other time 6♦ was bid.
| West | North | East | South |
| Shark | Jack | Shark | Jack |
| 1 ♣ | |||
| Pass | 1 ♦ | 1 ♥ | Pass |
| Pass | 2 ♥ | Pass | 3 ♣ |
| Pass | 4 NT | Pass | 5 ♣1 |
| Pass | 5 ♦ | Pass | 5 ♥2 |
| Pass | 6 ♦ | Pass | Pass |
| Pass |
1 one key card, 2 not the diamond queen
opening lead, ♣ A
At least N/S are on the same wave length. Can't play in 5D?
So in 6D from the North side, the human defense got it right some times (25%), but the robots were 0 for 3.
Board 12 of the same set was a lay down grand slam, with 7♥ the final contract at three of the six tables.
| Board 12 Dealer: West Vul: N/S |
♠ A 8 5 3 ♥ A K J 5 2 ♦ A ♣ A J 4 |
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♠ 10 9 6 2
♥ 7 ♦ K Q J 10 7 6 ♣ 6 5 |
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♠ Q J 7 4
♥ 3 ♦ 9 5 4 2 ♣ 10 8 7 3 |
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| ♠ K ♥ Q 10 9 8 6 4 ♦ 8 3 ♣ K Q 9 2 |
| West | North | East | South |
| Shark | Jack | Shark | Jack |
| 2 ♦ | Dbl | 4 ♦ | 4 ♥ |
| 5 ♦ | 7 ♥ | Pass | Pass |
| Pass |
| West | North | East | South |
| Jack | Shark | Jack | Shark |
| 3 ♦ | Dbl | Pass | 4 ♥ |
| Pass | 5 ♥ | Pass | 6 ♥ |
| Pass | Pass | Pass |
| West | North | East | South |
| Micro Bridge | Bridge Baron | Micro Bridge | Baron Baron |
| Pass | 2 ♣ | Pass | 2 ♥ |
| 3 ♦ | 4 ♥ | Pass | 4 NT |
| Pass | 5 ♥1 | Pass | 5 NT |
| Pass | 6 ♣2 | Pass | 7 ♥ |
| Pass | Pass | Pass |
1 2 or 5 key cards; 2 no kings
| West | North | East | South |
| Bridge Baron | Micro Bridge | Baron Baron | Micro Bridge |
| 3 ♦ | Dbl | 5 ♦ | 5 ♥ |
| Pass | 6 ♥ | Pass | Pass |
| Pass |
| West | North | East | South |
| Q-Plus | WBridge5 | Q-Plus | WBridge5 |
| Pass | 2 ♦1 | Pass | 2 NT |
| Pass | 3 ♥ | Pass | 4 NT |
| Pass | 5 NT2 | Pass | 7 ♥ |
| Pass | Pass | Pass |
1 strong (game force, 2♣ 22-23 total points); 2 five key cards
| West | North | East | South |
| WBridge5 | Q-Plus | WBridge5 | Q-Plus |
| Pass | 2 ♣1 | Pass | 2 ♥ |
| Pass | 3 ♥ | Pass | 3 ♠ |
| Pass | 4 NT | Pass | 5 ♣2 |
| Pass | 6 ♥ | Pass | Pass |
| Pass |
1 forcing to 2NT or game; 2 0 key cards (what else? Hans Leber reports that Q-Plus Bridge should have followed with 5NT, or not bid 4NT in the first place).
In human competition, the deal was played at 22 tables in each category. 7♥ was reached 10 times in the Bermuda Bowl, 9 times in the Venice Cup (played once in 4♥), and 9 times in the d'Orsi Senior Trophy (played once in 5♥).
So the robots' percentage was slightly better than in the human competition.