The so-called Lasker combination, in which two runners will be sacrificed, is one of the spectacular attacks castling in chess. To apply, but must meet some requirements. Consider a castling position:
Such castling position is extremely safe. Tarrasch points out that a knight on f6 and f3 is the best protection for the short castling [1].
In the above position to meet the queen and runners also point g5, which can be important when playing white knight of want to go there.
play the Laskerkombination , you must be distributed by the Knight f6 and f3. In the lower diagram from the game Lasker - Bauer (Amsterdam 1889), White takes this company in the same attack.
1.Sh5! Sxh5? (even the crucial mistake; relatively best is 1 - Tfd8, but which receives a double black pawn on f6) 2.Lxh7 +! Kxh7 3.Dh5 + Kg8 4.Lxg7! (the second runner is sacrificed) Kxg7 5.Dg4 + Kh7 (chart)
now clear what the actual plan. The tower is by means of 6.Tf3 on the h-line is played (in the game now play e5 and Black had to give the queen on h6, which White could also bifurcate Qd7 with the two runners).
The Lasker combination, it is important that the attacker has available a tower that is threatening a checkmate on the h-line.
beginning I said that a lady is on d8 with the bishop on e7 is a good defense Figer. Had the lady of black not been on c6, but on d8, the combination would Lasker did not play. Consider the position after 4.Qg4 + with a black queen on d8: There
Black the bishop on g5 back and maintains a multi-character for two pawns. One must be careful so that not to overlook a defensive resource, otherwise the combination proves a boomerang.
In the earlier game played Burn - Owen (Liverpool 1884) overlooked the black attackers such a resource.
white has no knight on f3, then Black proposes equal to h2. 1st - Lxh2 +! 2.Kxh2 DH4 + 3.Kg1 Lxg2? (in this position, this train is a mistake, because White can sacrifice after the drawing of the f-pawn the queen against the black tower and two runners, and tower for ) Receives 4.f3!
After 4 - TF6 would play White 5.Dxg2. Black was forced 4 - play Lxf1 5.Lxf1 , after which there was no attack, and White won more later.
But how is the combination of increase? Tony Miles shows us in his game against Dizdarevic (Biel 1985).
1st - Lxh2 +! 2.Kxh2 DH4 + 3.Kg1 Bf3! (chart)
This is the train that Owen missed! Black blocks the f-pawn, so that it can no longer engage the white lady. Dizdarevic experimented 4.Sd2 . Since the Springer now access the lady to the king disguised wing, Black could take on g2. 4th - Lxg2! 5.f3 TF6 6.Sc4 LH3 0-1.
I must say that the so-called combination Lasker-playable only under certain conditions. Often these are not met, otherwise, one would see more often.
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[1] Tarrasch, Siegbert: The Chess Game
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