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Lesson 19

Lesson goals:

 Discovered check
 Discovered attack
 The “Mill” in Chess

The “discovery” is a very important and powerful tactical tool in chess. It has different variations such as
the “discovered check”, the “discovered attack”, the “Mill”, and “double check”.

Let us look at an example of each, starting with the discovered check.
XABCDEFGHY
8-+-+-+-+(

7+k+-+-+-'
6-+-+-+qzp&
5+-+N+-+-%
4-+-+-zP-zP$
3+-+-+LzP-#

2-+-+-+K+"
1+-+-+-+-!
xabcdefghy
In the position above, White by moving the Knight will “uncover” the Bishop and therefore check the
Black King. If the Knight is able to find a square, from where it attacks something (for example, like the
Black Queen), that is how White can take advantage of such opportunity. The correct move is 1.Ne7+.
After Black moves out of the check, White captures the Queen with 1.Nxg6.
XABCDEFGHY
8-+-+-tr-mk(
7+pzpq+pzpp'

6-+-+-+n+&
5+-+N+-+-%
4-+-+-+-+$
3+P+-+Q+P#

2r+P+-zPP+"
1+-+R+RmK-!
xabcdefghy
In this position, if the Black King was on g8 instead of h8 – then Nd5-f6+ would be the answer. But now,
there is no discovered check. However, White can gain material by playing 1.Nb4, exposing the Rook on
d1 to attack the Black Queen on d7, while the Knight attacks the Black Rook on a2.

As we can see discovery is a special sort of a double attack.

SPF Chess Training Program for Teachers © Page 41 4/19/2014