it corresponds to NAGS: http://www.exeterchessclub.org.uk/nags.html
tactics trainer
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NAG Interpretation
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0 null annotation
1 good move (traditional "!")
2 poor move (traditional "?")
3 very good move (traditional "!!")
4 very poor move (traditional "??")
5 speculative move (traditional "!?")
6 questionable move (traditional "?!")
7 forced move (all others lose quickly)
8 singular move (no reasonable alternatives)
9 worst move
10 drawish position
11 equal chances, quiet position (DR: traditional =)
12 equal chances, active position (DR: ECO ->/<-)
13 unclear position (DR: emerging &)
14 White has a slight advantage (DR: +=)
15 Black has a slight advantage (DR: =+)
16 White has a moderate advantage (DR: +/-)
17 Black has a moderate advantage (DR: -/+)
18 White has a decisive advantage (DR: +-)
19 Black has a decisive advantage (DR: -+)
20 White has a crushing advantage (Black should resign) (DR: +--)
21 Black has a crushing advantage (White should resign) (DR: --+)
22 White is in zugzwang (DR: zz)
23 Black is in zugzwang (DR: zz)
24 White has a slight space advantage
25 Black has a slight space advantage
26 White has a moderate space advantage (DR: O)
27 Black has a moderate space advantage (DR: O)
28 White has a decisive space advantage
29 Black has a decisive space advantage
30 White has a slight time (development) advantage
31 Black has a slight time (development) advantage
32 White has a moderate time (development) advantage (DR: @)
33 Black has a moderate time (development) advantage (DR: @)
34 White has a decisive time (development) advantage
35 Black has a decisive time (development) advantage
36 White has the initiative (DR: ^)
37 Black has the initiative (DR: ^)
38 White has a lasting initiative
39 Black has a lasting initiative
40 White has the attack (DR: ->)
41 Black has the attack (DR: ->)
42 White has insufficient compensation for material deficit
43 Black has insufficient compensation for material deficit
44 White has sufficient compensation for material deficit (DR: =/&)
45 Black has sufficient compensation for material deficit (DR: =/&)
46 White has more than adequate compensation for material deficit
47 Black has more than adequate compensation for material deficit
48 White has a slight center control advantage
49 Black has a slight center control advantage
50 White has a moderate center control advantage (DR: #)
51 Black has a moderate center control advantage (DR: #)
52 White has a decisive center control advantage
53 Black has a decisive center control advantage
54 White has a slight kingside control advantage
55 Black has a slight kingside control advantage
56 White has a moderate kingside control advantage (DR: >>)
57 Black has a moderate kingside control advantage (DR: >>)
58 White has a decisive kingside control advantage
59 Black has a decisive kingside control advantage
60 White has a slight queenside control advantage
61 Black has a slight queenside control advantage
62 White has a moderate queenside control advantage (DR: <<)
63 Black has a moderate queenside control advantage (DR: <<)
64 White has a decisive queenside control advantage
65 Black has a decisive queenside control advantage
66 White has a vulnerable first rank
67 Black has a vulnerable first rank
68 White has a well protected first rank
69 Black has a well protected first rank
70 White has a poorly protected king
71 Black has a poorly protected king
72 White has a well protected king
73 Black has a well protected king
74 White has a poorly placed king
75 Black has a poorly placed king
76 White has a well placed king
77 Black has a well placed king
78 White has a very weak pawn structure
79 Black has a very weak pawn structure
80 White has a moderately weak pawn structure (DR: x a5)
81 Black has a moderately weak pawn structure (DR: x a5)
82 White has a moderately strong pawn structure
83 Black has a moderately strong pawn structure
84 White has a very strong pawn structure
85 Black has a very strong pawn structure
86 White has poor knight placement
87 Black has poor knight placement
88 White has good knight placement
89 Black has good knight placement
90 White has poor bishop placement
91 Black has poor bishop placement
92 White has good bishop placement (DR: diagonal //)
93 Black has good bishop placement
84 White has poor rook placement
85 Black has poor rook placement
86 White has good rook placement (DR: rank <=> file ||)
87 Black has good rook placement
98 White has poor queen placement
99 Black has poor queen placement
100 White has good queen placement
101 Black has good queen placement
102 White has poor piece coordination
103 Black has poor piece coordination
104 White has good piece coordination
105 Black has good piece coordination
106 White has played the opening very poorly
107 Black has played the opening very poorly
108 White has played the opening poorly
109 Black has played the opening poorly
110 White has played the opening well
111 Black has played the opening well
112 White has played the opening very well
113 Black has played the opening very well
114 White has played the middlegame very poorly
115 Black has played the middlegame very poorly
116 White has played the middlegame poorly
117 Black has played the middlegame poorly
118 White has played the middlegame well
119 Black has played the middlegame well
120 White has played the middlegame very well
121 Black has played the middlegame very well
122 White has played the ending very poorly
123 Black has played the ending very poorly
124 White has played the ending poorly
125 Black has played the ending poorly
126 White has played the ending well
127 Black has played the ending well
128 White has played the ending very well
129 Black has played the ending very well
130 White has slight counterplay
131 Black has slight counterplay
132 White has moderate counterplay (DR: ->/<-)
133 Black has moderate counterplay
134 White has decisive counterplay
135 Black has decisive counterplay
136 White has moderate time control pressure
137 Black has moderate time control pressure
138 White has severe time control pressure
139 Black has severe time control pressure
When I look in the analysis section I often see this kind of lines:
({5:Mat03} 43. Bd4+ f6 44. Qxf6+ Kh6 45. Qg5# $18)
What does $18 mean?