(2) Perpetual Check Example
Perpetual Check

23.Rxg7+ Kxg7 [ 23...Kh8 24.Rxh7+ Bxh7 ( 24...Kg8 25.Rh8+ Kg7 26.Qh6# ) 25.Qf6+ Kg8 26.Rg2+ Bg6 27.Qxg6+ Kh8 28.Qg7# ]

24.Qf6+ Kg8 25.Rg2+ Bg6 26.Rxg6+ hxg6 27.Qxg6+ Kh8 28.Qh6+ Kg8 29.Qg6+ Kh8 30.Qh6+ Kg8 31.Qg6+ 1/2-1/2