that in case the other man is captured by a hostile man he could
recapture the latter. Thus, in Diagram 5, Black could defend his
Bishop by moving his Knight to either e4 or e8 in case White
attacks with the Rook from d1. Should White attack from e6, then
Black would not defend the Bishop with the Knight, for on e4 as
well as on e8 the Knight is unprotected and could be captured by
the Rook without White losing anything in exchange. Black has a
much more simple way to defend the attack of the Rook from e6,
that is, by capturing the Rook with the Pawn f7. For this reason
White would not have moved the Rook to e6.


Check and Checkmate


If a man makes a move which attacks the opposing King the King is
said to be in "check." The player whose King is checked then has
to make a move which gets the King out of check

+---------------------------------------+
8 | | | | | | | #K | |
|---------------------------------------|
7 | | | | | | #P | #P | |
|---------------------------------------|
6 | | | | #B | | #Kt| | #P |
|---------------------------------------|
5 | | | | | | | | |
|---------------------------------------|
4 | ^P | | | | | | | |
|---------------------------------------|