http://www.ianparmenter.com/hcutils2...prefs=ababcdae

Close combat attack between squares N-14 and O-15 legal? This would be a diagonal attack along a stairway that is 3 squares horizontal from elevation 3 to elevation 4.

Reference: Part of a stairway or ladder is on terrain of a lower elevation and part is on terrain of a higher elevation. A character must pass through the two squares of different elevation to change the character’s elevation. On some maps, the 2 squares of different elevations have numbered triangles where the number indicates the level of elevation of each side of the red boundary line. Characters occupying the two squares through which a character can change elevations can make close combat attacks against each other as if they were adjacent. Stairs and ladders are clear terrain, unless there are map boundary lines indicating otherwise.


Thanks!

Yes, that is legal.

More info from the Player's guide:

Stairs and Ladders
- The rules for stairs and ladders allow movement and close combat through 2 squares of different elevations if they (a) are otherwise adjacent squares and (b) are squares that include a traiangle with the elevation level. If these 2 conditions are met – even if the squares do not share an edge – then the movement or close combat attack can be made.

Agreeing with Moompix; furthermore, it'd be good to note that this would be illegal, K10 to L11 since there's only two square of "ladders" there.