User can 'skip' over 1-2 spaces in a selected direction. Distance depends on weight carried , STR and DEX of the user. This skill may also be used as an attack. Jumping is a Physique skill type.

Unknown, should immediately attempt to jump in the direction, the player is facing.
Syntax : use_skill jumping

User can 'skip' over 1-2 spaces in a selected direction when fired with the shift key.
This will attack if a creature is in the way.
Syntax : ready_skill jumping

From Server source crossfire/server/skills.c int jump(object *pl, int dir, object *skill) :
stats=str*str*str*dex * skill→level;

Distance limited to 2 tiles:

    if(pl->carrying!=0)		/* don't want div by zero !! */
	spaces=(int) (stats/pl->carrying);
    else
	spaces=2;	/* pl has no objects - gets the far jump */
 
    if(spaces>2)
	 spaces = 2;
    else if(spaces==0) {
	new_draw_info(NDI_UNIQUE, 0,pl,"You are carrying too much weight to jump.");
	return 0;

The source code has a comment that asks for allowing a greater distance to jump :

* Perhaps we should allow more spaces based on level, eg, level 50
* jumper can jump several spaces?