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Analyzers of Search Engine Mistakes

Search engine mistakes are the negative side of its ability to refine and to understand the query (discussed in the Query Comprehension section). The queries in this group were sought out to demonstrate such mistakes in a most vivid and obvious manner. They might seem exotic, but every active search engine user knows that such mishaps tend to occur quite regularly.
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Search Engine Mistakes

89.1 ▼0.4
86.2 ▼1.1
81.8 ▼1.1
80.6 ▼0.6
51.0 ▼0.6
20.3 ▼2.7

Query Substitution

The lower the better
29.6 ▲0.5
35.3 ▼1.5
36.5  
40.4 ▼0.7
57.1 ▼0.2
66.7 ▲3.9

Phrase Substitution

The lower the better
30.5 ▲0.7
42.3 ▼0.3
44.8 ▼0.5
49.5 ▲0.3
53.4 ▼0.3
72.8 ▼1.6

Names Search

73.9 ▲0.1
57.1 ▲0.4
54.1 ▲0.1
50.9 ▼0.7
17.7 ▲0.4
5.2 ▲1.8

Unbreakable Queries

62.6 ▼0.4
59.8  
58.0 ▼0.7
54.0 ▲0.1
30.5 ▼0.2
0.4 ▼7.1

Quality of Grammatical Interpretation

71.2 ▲2.1
67.7 ▲0.8
65.3 ▼0.2
52.1 ▼0.2
41.4 ▲0.3
6.7 ▼4.7