the dilemma is i.e. a special motive for chess, a special form of departure chess. In a consequence of chess requirements and departure chess wins one material. A dilemma occurs in tournament practice very rarely.
on the first view is white in difficulties. The Lg5 is attacked, if it pulls goes through Dxh5 the lady away lost.
Torre played 25.Lf6!. After 25. - Dxh5 (forced, because otherwise the black lady is probably lost) 26.Txg7+ to have we a dilemma.
26. - Kh8 only course 27.Txf7+ - Departure chess 27. - Kg8 only course 28.Tg7+ Kh8 etc. 29.Txb7+ Kg8 30.Tg7+ Kh8Torre does without Txa7+ not to bring around the black tower on a8 in the play 31.Tg5+ - now it fetches still the lady 31. - Kh7 The dilemma is terminated 32.Txh5 Kg6 33.Th3 Kxf6 34.Txh6+ White has now 3 multi-farmers. Lasker played still some courses further and gave up in the 43.Zug.