Method for operating an electronically controlled gas cooker, wherein the gas cooker has at least one cooking area (KS, 112 to 115) including a burner (117 to 120, 218) and a cooking vessel (KG, 116, 216) is arranged on a first cooking area (KS1, 113), including determination of suitability of said cooking area (KS1, 113) of the gas cooker for the cooking vessel (KG, 116, 216) arranged on said cooking area (KS1, 113), wherein the following steps (306 and 307) are performed: 1a) obtaining a cooking vessel bottom diameter (KGB-Ø) of the cooking vessel (KG, 116, 216) arranged on the first cooking area (KS1, 113), 1b) obtaining a cooking vessel target flame ring diameter (KG_SFK-Ø), said diameter being a burner flame ring diameter, wherein a very high or optimum heat input into the cooking vessel (KG, 116, 216) is achieved, characterized in that the following further steps (308 to 310) are performed: 1c) obtaining a cooking area target flame ring diameter (KS_SFK-Ø) of the first cooking area (KS1, 113) and the limits (125, 225a, 225b) of a related tolerance range, wherein the cooking area target flame ring diameter (KS_SFK-Ø) is a function of the predefined burner type of the burner (118, 218) of the cooking area (KS1, 113), and preferably is that burner flame ring diameter at which the burner (118, 218) of the cooking area (KS1, 113) has a high or its best efficiency, 1d) checking, if the cooking vessel target flame ring diameter (KG_SFK-Ø) is within or beyond the tolerance range (130, 230) of the cooking area target flame ring diameter (KS_SFK-Ø) of the first cooking area (KS1, 113), 1e) determining the suitability of the first cooking area (KS1, 113) for the cooking vessel (KG, 116, 216), wherein the first cooking area (KS1, 113) is considered to be suitable in case that the cooking vessel target flame ring diameter (KG_SFK-Ø) is within the tolerance range (130, 230) of the cooking area target flame ring diameter (KS_SFK-Ø), and the cooking area (KS1, 113) is considered not to be suitable in case that the cooking vessel target flame ring diameter (KG_SFK-Ø) is beyond said range. 1a) obtaining a cooking vessel bottom diameter (KGB-Ø) of the cooking vessel (KG, 116, 216) arranged on the first cooking area (KS1, 113), 1b) obtaining a cooking vessel target flame ring diameter (KG_SFK-Ø), said diameter being a burner flame ring diameter, wherein a very high or optimum heat input into the cooking vessel (KG, 116, 216) is achieved, 1c) obtaining a cooking area target flame ring diameter (KS_SFK-Ø) of the first cooking area (KS1, 113) and the limits (125, 225a, 225b) of a related tolerance range, wherein the cooking area target flame ring diameter (KS_SFK-Ø) is a function of the predefined burner type of the burner (118, 218) of the cooking area (KS1, 113), and preferably is that burner flame ring diameter at which the burner (118, 218) of the cooking area (KS1, 113) has a high or its best efficiency, 1d) checking, if the cooking vessel target flame ring diameter (KG_SFK-Ø) is within or beyond the tolerance range (130, 230) of the cooking area target flame ring diameter (KS_SFK-Ø) of the first cooking area (KS1, 113), 1e) determining the suitability of the first cooking area (KS1, 113) for the cooking vessel (KG, 116, 216), wherein the first cooking area (KS1, 113) is considered to be suitable in case that the cooking vessel target flame ring diameter (KG_SFK-Ø) is within the tolerance range (130, 230) of the cooking area target flame ring diameter (KS_SFK-Ø), and the cooking area (KS1, 113) is considered not to be suitable in case that the cooking vessel target flame ring diameter (KG_SFK-Ø) is beyond said range.