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Lesson 20

Lesson goals:

 Double check
 Trapping pieces

Double check is an even more powerful version of discovery.

When you give a double check neither check-giving piece can be captured.

Here are a few examples:
XABCDEFGHY

8kwq-+-+-+(
7+-+-sn-vl-'
6-+-+-+-+&
5+-+-+-+-%
4L+-+-+-+$

3+-+-+-+-#
2-+-+-+K+"
1tR-+-+-+-!

xabcdefghy
White’s Rook is under attack, but White can still checkmate in one with 1.Bc6! (putting the Bishop also
under attack – by Black’s Knight).
XABCDEFGHY
8-+-+-+-+(
7+-+k+-+-'

6-zp-+-zp-+&
5+-+-+-+-%
4-+-+-+-+$
3+q+N+-+-#

2-+-+-zP-+"
1+-+R+K+-!
xabcdefghy
Here the regular discovery with 1.Nc1+ fails, because Black can capture the Rook on d1. But the double
check comes to the rescue! 1.Nc5+ wins the Black Queen, as neither the Knight or the Rook can be
captured, because the King is in check from both!

Another way to gain material is simply trapping pieces. When we trap the King, we call it “checkmate”.
When we trap any of the other pieces it’s simply “trapping” a certain piece.

SPF Chess Training Program for Teachers © Page 44 4/19/2014