A method of controlling a reciprocating internal combustion piston engine, the engine comprising a pre-chamber in fluid communication with a combustion cylinder via a tip of the pre-chamber extending at least partially into the combustion chamber, the method comprising the following method steps: - introducing charge gases into the combustion cylinder of the engine; - introducing a main amount of gaseous fuel into the combustion cylinder using a main gas admission device, to form a main charge with the charge gases; - introducing a first prescribed amount of gaseous fuel into the pre-chamber using a pre-chamber gas admission device, wherein the gaseous fuel of the first prescribed amount at least partially scavenges residual gases generated in a preceding combustion cycle from the pre-chamber to the combustion chamber, prior to a subsequent combustion cycle, and - introducing a second prescribed amount of gaseous fuel into the pre-chamber using the pre-chamber gas admission device to form a pre-chamber charge, and igniting the pre-chamber charge using an igniter at least partially disposed in the pre-chamber, wherein ignition of the pre-chamber charge subsequently ignites and combusts the main charge, characterized in that an interval corresponding at least to a crankshaft rotation of 30 deg is provided between introducing the first prescribed amount of gaseous fuel and introducing the second prescribed amount of gaseous fuel within a single combustion cycle, wherein the first prescribed amount of gaseous fuel is introduced subsequent to closing an exhaust valve of the combustion cylinder, wherein the first prescribed amount of gaseous fuel is introduced when an inlet valve of the combustion cylinder is open, such that the first prescribed amount of gaseous fuel is introduced prior to a closure of the inlet valve, preferably introducing the first prescribed amount of gaseous fuel is stopped at a time period corresponding to a crankshaft rotation of 20 deg prior to the closure of the inlet valve, at the latest, and wherein the second prescribed amount of gaseous fuel is introduced subsequent to the closure of the inlet valve. the engine comprising a pre-chamber in fluid communication with a combustion cylinder via a tip of the pre-chamber extending at least partially into the combustion chamber, the method comprising the following method steps: - introducing charge gases into the combustion cylinder of the engine; - introducing a main amount of gaseous fuel into the combustion cylinder using a main gas admission device, to form a main charge with the charge gases; - introducing a first prescribed amount of gaseous fuel into the pre-chamber using a pre-chamber gas admission device, wherein the gaseous fuel of the first prescribed amount at least partially scavenges residual gases generated in a preceding combustion cycle from the pre-chamber to the combustion chamber, prior to a subsequent combustion cycle, and - introducing a second prescribed amount of gaseous fuel into the pre-chamber using the pre-chamber gas admission device to form a pre-chamber charge, and igniting the pre-chamber charge using an igniter at least partially disposed in the pre-chamber, wherein ignition of the pre-chamber charge subsequently ignites and combusts the main charge, - introducing charge gases into the combustion cylinder of the engine; - introducing a main amount of gaseous fuel into the combustion cylinder using a main gas admission device, to form a main charge with the charge gases; - introducing a first prescribed amount of gaseous fuel into the pre-chamber using a pre-chamber gas admission device, wherein the gaseous fuel of the first prescribed amount at least partially scavenges residual gases generated in a preceding combustion cycle from the pre-chamber to the combustion chamber, prior to a subsequent combustion cycle, and - introducing a second prescribed amount of gaseous fuel into the pre-chamber using the pre-chamber gas admission device to form a pre-chamber charge, and igniting the pre-chamber charge using an igniter at least partially disposed in the pre-chamber, wherein ignition of the pre-chamber charge subsequently ignites and combusts the main charge, characterized in that an interval corresponding at least to a crankshaft rotation of 30 deg is provided between introducing the first prescribed amount of gaseous fuel and introducing the second prescribed amount of gaseous fuel within a single combustion cycle, wherein the first prescribed amount of gaseous fuel is introduced subsequent to closing an exhaust valve of the combustion cylinder, wherein the first prescribed amount of gaseous fuel is introduced when an inlet valve of the combustion cylinder is open, such that the first prescribed amount of gaseous fuel is introduced prior to a closure of the inlet valve, preferably introducing the first prescribed amount of gaseous fuel is stopped at a time period corresponding to a crankshaft rotation of 20 deg prior to the closure of the inlet valve, at the latest, and wherein the second prescribed amount of gaseous fuel is introduced subsequent to the closure of the inlet valve.