!! only correct move that is unexpected
! only correct move when other moves also seem reasonable
?! dubious move
?!! dubious move that is interesting
!? interesting move
!?? interesting move that is dubious
= equal position
<> equal but slightly sharp
<<>> equal and sharp
<<<>>> equal and very sharp
<= {=>} very slight advantage – under a pawn
<+ {+>} slight advantage – at least 1 pawn and <2 pawns
< {>} advantage – at least 2 pawns and <3 pawns
<< {>>} clear advantage – at least 3 pawns and <4 pawns
<<< {>>>} winning advantage – at least 4 pawns