After 1. P to K 4, P to K 4; 2. Kt to K B 3, Black may defend the attacked
King's pawn with 2.... P to Q 3, and this constitutes _Philidor's Defence_.
WHITE. BLACK.
1. P to K 4 1. P to K 4
2. Kt to K B 3 2. P to Q 3
3. P to Q 4 3. P takes P
4. Kt takes P ...
If 4. Q takes P, Black replies 4.... Kt to Q B 3 (best); 5. B to Q Kt 5, B
to Q 2; 6. B takes Kt, B takes B; 7. B to Kt 5, Kt to B 3; 8. B takes Kt.
{382} Q takes B; 9. Q takes Q, P takes Q; 10. Kt to B 3, and Black has two
Bishops against two Knights, and an open Kt and K file for his Rooks, and
consequently the advantage.
... 4. Kt to K B 3
5. B to Q B 4 5. B to K 2
Equal game.