B to Kt 5 8. -------------- Q takes P: ch.
P to Kt 4: ch. 12. -------------- K takes P [99]
R to Kt sq.: ch. 14. ---------------- K to R 5
P to Q B 3 15. --------------- P to Q R 4[100]
B to Kt 5: ch. 16. -------------- K to R 6
Kt to B 4: ch. 17. -------------- K takes P
R to Kt 2: ch. 18. -------------- K to R 8
This variation has been selected to illustrate mate being given by castling.
The _Three Knights' Game_ is brought about if, after 1. P to K 4, P to K 4; 2. Kt to K B 3, Kt to Q B 3, White plays 3. Kt to B 3, The following is an example:
WHITE. BLACK. 1. P to K 4 1. P to K 4 2. Kt to K B 3 2. Kt to Q B 3 3. Kt to B 3 3. B to Kt 5 4. B to Kt 5 4. K Kt to K 2 5. P to Q 4 5. P takes P 6. Kt takes P 6. Castles
If Black moves 3. ... Kt to B 3, the previous moves being the same as in the Three Knights' Game, it is called the _Four Knights' Game_. It is convertible into a Ruy Lopez, if White plays 4. B to Kt 5; and into a Double Ruy Lopez, if Black replies 4. ... B to Kt 5.
WHITE. BLACK. 1. P to K 4 1. P to K 4 2. Kt to Q B 3 2. Kt to K B 3 3. Kt to B 3 3. Kt to B 3 4. B to Kt 5 4. B to Kt 5 5. Castles 5. Castles 6. Kt to Q 5 6. Kt takes Kt 7. P takes Kt 7. P to K 5 8. P takes Kt 8. P takes Kt 9. Q takes P
If White had played 9. P takes Q P, Black's best reply would have been 9. ... P takes P, attacking the Rook; if 9. P takes Kt P, Black replies 9. ... B takes Kt P, with a promising attack.
... 9. Q P takes P 10. B to K 2 10. B to Q 3
If, after 1. P to K 4, P to K 4, White plays 2. Kt to Q B 3, the _Vienna Opening_ is the result. The Q Kt does not act immediately, but rather seems to relinquish the advantage of the first move; but this is only apparently so. For in all Openings the Q Kt plays an important rôle, and, having this piece in play, White soon resumes the attack, and with increased vigour in certain variations.
The defences for Black are--2. ... B to B 4; 2. ... B to Kt 5; 2. ... Kt to Q B 3; 2. ... Kt to K B 3. The latter yields the most satisfactory results. 2. ... Kt to Q B 3 may lead to the Steinitz Gambit, a difficult game for both sides; whilst 2. ... B to Kt 5 is the least satisfactory variation of all.
WHITE. BLACK. 1. P to K 4 1. P to K 4 2. Kt to Q B 3 2. Kt to K B 3 3. P to B 4 3. P to Q 4 (best)