Statistics of 130000 bridge boards

Contracts by score

In table 1 and image 1 you can see an overview of contracts by score.

table 1	Total	Perc
Pas	391	0.30%
Partscores	48654	37.12%
Manches	72367	55.21%
Small slam	8454	6.45%
Grand slam	1216	0.93%
Total	131082	100.01%
Doubled	9724	7.42%
Redoubled	122	0.09%

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Contracts by type

Table 2 is an overview of contracts by type, image 2 shows the frequency by suit in percentage, image 3 shows the frequency of all contracts.

table 2	1		2		3		4		5		6		7		Total
Clubs	72	0.05%	1503	1.15%	3714	2.83%	1240	0.95%	3283	2.50%	1651	1.26%	233	0.18%	11696	8.92%
Diamonds	141	0.11%	2437	1.86%	4151	3.17%	1112	0.85%	3536	2.70%	1582	1.21%	210	0.16%	13169	10.05%
Hearts	377	0.29%	5563	4.24%	4521	3.45%	16926	12.91%	1781	1.36%	2159	1.65%	330	0.25%	31657	24.15%
Spades	806	0.61%	7934	6.05%	4711	3.59%	19608	14.96%	1315	1.00%	2247	1.71%	260	0.20%	36881	28.14%
Notrump	8004	6.11%	2368	1.81%	25377	19.36%	502	0.38%	39	0.03%	815	0.62%	183	0.14%	37288	28.45%
Pass															391	0.30%
Total	9400	7.17%	19805	15.11%	42474	32.40%	39388	30.05%	9954	7.59%	8454	6.45%	1216	0.93%	131082	100.01%

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Contracts results

Table 3 shows the results of all contracts, table 4 shows the results per contract.

Results all deals 1	Total	Perc.
Overtricks	41013	31.53%
Exact	41715	32.07%
Down	47356	36.40%
Total	130084	100.00%

Contract	Made 1	Perc	Down	Perc
1NT	5276	66.16%	2699	33.84%
2NT	1345	56.99%	1015	43.01%
3NT	17554	69.50%	7704	30.50%
4H	11373	67.53%	5469	32.47%
4S	12772	65.47%	6736	34.53%
5c	1486	62.44%	894	37.56%
5d	1571	61.10%	1571	38.90%
6x All small slam	5502	65.38%	2913	34.62%
7x All grand slam	805	66.26%	410	33.74%

1. the result ( = number of tricks made) was not always recorded hence the difference with the first 2 tables

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2NT results

As 2NT contracts went down 7% more than was expected I tried to investigate.
Table 5 shows the difference between 2NT arrived after several bids and a 2NT opening that was passed out.
Image 4 shows the average number of tricks.

table 5	Tricks	Frequency	Average tricks
2NT opening bid	1186	169	7.02
2NT bid not opened with 2NT	16490	2178	7.57
All 2NT	17676	2347	7.50

Table 6 shows the results for the 2NT bids
Image 5 shows the results of 2NT compared with all contracts.

Table 6	perc. made	perc. down
2NT opening bid	40.24	59.76
2NT bid not opened with 2NT	56.88	43.12

Image 6 shows how 1NT contract are made more often

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Results for suit partscores

Image 7 shows details on suit partscores

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Results for all contracts.

Image 8 shows details on all contracts. For partscores you can see the percentage missed manches, for manches the percentage missed small slems, and for small slem the percentage missed grand slems

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Tricks made

Image 9 shows number of tricks in percentages (all deals).



Conclusions

• The most obscure contract is 5NT
• The odds to end up in one club are 5 in 10000, so don't be afraid to open one club with short clubs
• At the two level spades is the most played contract
• At the three level spades is the most played suit, but the difference is not as big as at the two level
• The most played contract is three no trump followed by four spades, four hearts and one no trump
• When you end up in one heart or one spade you have more 70% chance to make it, probably due to strong hands that open one in a major
• You are most likely to have missed a manche when you end up in two notrumps or two in a major
• Too many two notrump contracts were going down. The opening bid of 2NT followed by three passes is doing very poor, only 40% of these contract are made, you might consider making the 2NT opening stronger. 2NT contracts are often down.
• Three hearts and three spades are also often going down probably due to preempts, competition and invites that were too high
• Three notrump contracts are often made, because if you belong in four or five NT you stay in three
• Four hearts is made more often than four spades, because four spades can be a save against four hearts
• At the six level we see that too little minor suit slems are bid, it should have been around 2% higher,I guess those were played in 3NT
• 85% of the 7NT contracts are made
• The average number of tricks made is 9.1
• In 42% of the deals you will score 9 or 10 tricks
• 13 tricks are more likely than 5 or less!