The third move made by Black accomplishes nothing, and is simply a waste of time. He should have continued by bringing his Knights into play. His fourth move is also a mistake; he should develop the Knights before the Bishops.
5
KtxP
BxQ
6
BxKBP ch
K-K2
7
Kt-Q5 mate
On his fifth move, Black jumps at the chance to win White’s Queen, but this is not of the slightest benefit to him, because the object of the game is not to win the Queen, but to mate the King. At the seventh move the beginner will see that the black King cannot move out of check, neither can he move into check by taking the Bishop. He has no piece that can capture the Knight that gives the check, and nothing can be interposed, so he is mated, and White wins.