In Chess can king legally cross line of off color bishop?

If a white king is on F1 and a black bishop is on G3 can the king move to E2 legally or is this against official chess rules. If you find it to be illegal please post a reference.

I was taught this rule by my grandfather from a book I no longer posses. I have no problem if it is not a rule I just want to know officially what the rule is one way or the other as it has been a point of contention with a few opponents of mine. I remember hearing it called crossing a line of check or crossing a line of attack.

Also acceptable would be a reference to a game online played by a grandmaster where a king was moved across the line of attack of a bishop as illustrated.

Referenced to FIDE especially appreciated.



Please no one say my chess computer allows it. Chess computers have been known to do such weird things as moving bishops sideways or breaking FIDE castling rules.In Chess can king legally cross line of off color bishop?
Sure, Ke2 is legal (providing of course that no other Black piece attacks that square). Don't quite know what your grandfather was talking about...but it's incorrect in this instance, in any event. (And no, no decent chess computer will allow illegal moves. If yours does, get a new one.)
if the bishop is on g3, it controls e1, f2, g3, and h4

if the bishop is on g3, it controls b8, c7, d6, e5, f4, g3, and h2

the king can dance around g2, f3, g4, and h3

....99.99% of the time if a chess computer allows it?

....it's probably legit !!



if there is a ROOK on g3

and the king is on b2? then a3, b3, and c3 is forbidden





this is a chess rule that every chess player learns on day one !!In Chess can king legally cross line of off color bishop?
If the king is not in check after the move is made, then the move is legal.



In other words, the answer to your question is "yes".
why would you say something like that in reply to my question? it seems to be a pretty insulting response to a simple question that you didn't have to answer.In Chess can king legally cross line of off color bishop?
the king can only move on squares beside it without skipping on squares where it won't be in check
The King in that situation can move from f1 to e2.



Bishops only control squares of one color. In this case, you're talking about a bishop that only controls dark squares (since it's on the g3 square).



By moving from f1 to e2 (both light squares), the King remains out of range from the g3 Bishop. Each of your two Bishops can only control squares of one color, and squares of the opposite color are totally out of a Bishop's range during the entire game. A Bishop can never move from one color square to a different color square. It is confined to squares of its original color for the entire game.



It's possible to have two Bishops which both control the same color squares, but this can only happen if a pawn is promoted to a bishop and the promotion square is the same color as that which is controlled by one of your Bishops that is still on the board.



The fact that a Bishop only controls squares of one color is one reason why a King and Bishop alone can not checkmate the opposing King. Kings can not directly attack each other, and the lone King can permanently keep out of range of the Bishop simply by always occupying a square of the opposite color from that which the Bishop controls.