well i don't understand something here, if the 'guard' can move 1 or 2
squares in any direction, it must be easily more powerful than the knight
or bishop, but you say it is not as strong as these pieces ... even a
piece that can move like a 'king' is more powerful than a knight or
bishop.
Joe and i recently put out 'the shortrange project', and in these
variants we have a 'sliding general' (moves 1 or 2 squares any
direction) or a 'queen-2-slider' (moves like a queen, but only 1 or 2
squares), and both of these are easily more powerful than the humble yet
beautiful bishop and knight.
so either i don't understand how your guard moves, or you don't realise
how powerful it is :)