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Chess and Checkers : the Way to Mastership by Edward Lasker
page 124 of 267 (46%)
the latter case he cannot place the Queen's Knight on c6 as this
would block the way of the c-Pawn. He must develop him to d7.
This appears to be a bad move as it blocks the way of the Queen's
Bishop, but this Bishop will have to be developed in a different
diagonal anyway as the Pawn e6 cannot advance opening the
diagonal c8-h3.

I. (4) ... Ktb8-d7
(5) B-g5

The fact that White can develop his Queen's Bishop without
difficulty while Black cannot do so has made the Queen's Gambit
one of the most popular openings.

(5) ... B-e7
(6) P-e3 o-o
(7) B-d3 P-b6
(8) o-o B-b7
(9) Pxd5 Pxd5
(10) R-c1

White is two moves ahead in the development, as Black has still
to move his c-Pawn before he can get his Queen's Rook into play.
In the meantime White can mobilize his King's Rook with Q-e2 and
Rf1-d1, with a view to opening the Queen's file by Pd4xc5.

II. (4) ... P-c5

If White now Plays P-e3, holding his Pawn-center, a symmetrical
development follows on both sides. If, however, White takes his
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